Using Gitea-compatible upload-artifact action

Also improved error reporting for common failure cases.

.gitattributes

@@ -0,0 +1,4 @@
+*.psk filter=lfs diff=lfs merge=lfs -text
+*.psa filter=lfs diff=lfs merge=lfs -text
+*.pskx filter=lfs diff=lfs merge=lfs -text
+*.blend filter=lfs diff=lfs merge=lfs -text

.github/workflows/main.yml

@@ -1,4 +1,4 @@
-name: Build Extension
+name: tests
 
 on:
   workflow_dispatch:
@@ -10,39 +10,71 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        blender-version: [ 5.0 ]
     env:
-      BLENDER_VERSION: blender-4.2.0-beta+v42.d19d23e91f65-linux.x86_64-release
+      ADDON_NAME: io_scene_psk_psa
     steps:
-      - uses: actions/checkout@v3
-      - name: Set derived environment variables
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: true
+      - name: Checkout LFS objects
         run: |
-          echo "BLENDER_FILENAME=${{ env.BLENDER_VERSION }}.tar.xz" >> $GITHUB_ENV
-          echo "BLENDER_URL=https://cdn.builder.blender.org/download/daily/${{ env.BLENDER_VERSION }}.tar.xz" >> $GITHUB_ENV
+          git lfs install --local
+          AUTH=$(git config --local http.${{ github.server_url }}/.extraheader)
+          git config --local --unset http.${{ github.server_url }}/.extraheader
+          git config --local http.${{ github.server_url }}/${{ github.repository }}.git/info/lfs/objects/batch.extraheader "$AUTH"
+          git lfs pull
+      - uses: SebRollen/toml-action@v1.2.0
+        id: read_manifest
+        with:
+          file: '${{ env.ADDON_NAME }}/blender_manifest.toml'
+          field: 'version'
       - name: Install Blender Dependencies
         run: |
+          sudo apt-get update -y
           sudo apt-get install libxxf86vm-dev -y
           sudo apt-get install libxfixes3 -y
           sudo apt-get install libxi-dev -y
           sudo apt-get install libxkbcommon-x11-0 -y
-          sudo apt-get install libgl1-mesa-glx -y
-      - name: Download & Extract Blender
+          sudo apt-get install libgl1 -y
+          sudo apt-get install libglx-mesa0 -y
+          sudo apt-get install python3 -y
+      - name: Install Requirements
         run: |
-          wget -q $BLENDER_URL
-          tar -xf $BLENDER_FILENAME
-          rm -rf $BLENDER_FILENAME
-      - name: Add Blender executable to path
+          sudo apt-get install python3-virtualenv -y
+          python3 -m virtualenv venv
+          source venv/bin/activate
+          pip install pytest-blender
+          pip install blender-downloader
+      - name: Install Blender
         run: |
-          echo "${{ github.workspace }}/${{ env.BLENDER_VERSION }}/" >> $GITHUB_PATH
+          source venv/bin/activate
+          blender_executable="$(blender-downloader ${{ matrix.blender-version }} --extract --print-blender-executable)"
+          echo "BLENDER_EXECUTABLE=${blender_executable}" >> $GITHUB_ENV
+          blender_python="$(pytest-blender --blender-executable "$blender_executable")"
+          echo "BLENDER_PYTHON=${blender_python}" >> $GITHUB_ENV
+          # Write the BLENDER_PYTHON path to the console for debugging
+          # Deactivate the virtualenv to avoid conflicts with the system python
+          deactivate
+          $blender_python -m ensurepip
+          $blender_python -m pip install -r tests/requirements.txt
       - name: Build extension
         run: |
-          pushd ./io_scene_psk_psa
-          blender --command extension build
+          pushd ./${{ env.ADDON_NAME }}
+          # Run blender using the environment variable set by the action
+          ${{ env.BLENDER_EXECUTABLE }} --command extension build
           mkdir artifact
-          unzip -q io_scene_psk_psa.zip -d ./artifact
+          unzip -q ${{ env.ADDON_NAME }}-${{ steps.read_manifest.outputs.value }}.zip -d ./artifact
           popd
+      - name: Run tests
+        run: |
+          source venv/bin/activate
+          pytest -svv tests --blender-addons-dirs .
       - name: Archive addon
-        uses: actions/upload-artifact@v4
+        uses: https://github.com/christopherHX/gitea-upload-artifact@v4
         with:
-          name: io_scene_psk_psa-${{ github.ref_name }}-${{ github.sha }}
+          name: ${{ env.ADDON_NAME }}-${{ github.ref_name }}-${{ github.sha }}
           path: |
-            ./io_scene_psk_psa/artifact/*
+            ./${{ env.ADDON_NAME }}/artifact/*

.gitignore

@@ -105,3 +105,4 @@ venv.bak/
 
 # PyCharm
 .idea
+*.blend1

.vscode/tasks.json

@@ -0,0 +1,17 @@
+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "io_scene_psk_psa: test",
+            "type": "shell",
+            "command": "docker run -it --volume ${PWD}:/io_scene_psk_psa --volume ${PWD}/io_scene_psk_psa:/addons/io_scene_psk_psa --volume ${PWD}/tests:/tests  $(docker build -q .)",
+            "problemMatcher": [],
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            }
+        }
+    ]
+}

Dockerfile

@@ -0,0 +1,35 @@
+FROM ubuntu:22.04
+
+RUN apt-get update -y && \
+    apt-get install -y libxxf86vm-dev libxfixes3 libxi-dev libxkbcommon-x11-0 libgl1 libglx-mesa0 python3 python3-pip \
+    libxrender1 libsm6
+
+RUN pip install --upgrade pip
+RUN pip install pytest-blender
+RUN pip install blender-downloader
+
+ARG BLENDER_VERSION=5.0
+
+# Set BLENDER_EXECUTABLE and BLENDER_PYTHON as environment variables
+RUN BLENDER_EXECUTABLE=$(blender-downloader $BLENDER_VERSION --extract --remove-compressed --print-blender-executable) && \
+    BLENDER_PYTHON=$(pytest-blender --blender-executable "${BLENDER_EXECUTABLE}") && \
+    echo "export BLENDER_EXECUTABLE=${BLENDER_EXECUTABLE}" >> /etc/environment && \
+    echo "export BLENDER_PYTHON=${BLENDER_PYTHON}" >> /etc/environment && \
+    echo $BLENDER_EXECUTABLE > /blender_executable_path
+
+RUN pip install pytest-cov
+
+# Source the environment variables and install Python dependencies
+# TODO: would be nice to have these installed in the bash script below.
+RUN . /etc/environment && \
+    $BLENDER_PYTHON -m ensurepip && \
+    $BLENDER_PYTHON -m pip install pytest pytest-cov psk-psa-py==0.0.4
+
+# Persist BLENDER_EXECUTABLE as an environment variable
+RUN echo $(cat /blender_executable_path) > /tmp/blender_executable_path_env && \
+    export BLENDER_EXECUTABLE=$(cat /tmp/blender_executable_path_env)
+ENV BLENDER_EXECUTABLE /tmp/blender_executable_path_env
+
+ENTRYPOINT [ "/bin/bash", "-c" ]
+WORKDIR /io_scene_psk_psa
+CMD ["source tests/test.sh"]

README.md

@@ -1,6 +1,5 @@
-[![Blender](https://img.shields.io/badge/Blender->=2.9-blue?logo=blender&logoColor=white)](https://www.blender.org/download/ "Download Blender")
-[![GitHub release](https://img.shields.io/github/release/DarklightGames/io_scene_psk_psa?include_prereleases=&sort=semver&color=blue)](https://github.com/DarklightGames/io_scene_psk_psa/releases/)
-[![Build Extension](https://github.com/DarklightGames/io_scene_psk_psa/actions/workflows/main.yml/badge.svg)](https://github.com/DarklightGames/io_scene_psk_psa/actions/workflows/main.yml)
+[![Blender](https://img.shields.io/badge/Blender%20Extension-Download-blue?logo=blender&logoColor=white)](https://extensions.blender.org/add-ons/io-scene-psk-psa/ "Download Blender")
+[![tests](https://github.com/DarklightGames/io_scene_psk_psa/actions/workflows/main.yml/badge.svg)](https://github.com/DarklightGames/io_scene_psk_psa/actions/workflows/main.yml)
 
 [![ko-fi](https://ko-fi.com/img/githubbutton_sm.svg)](https://ko-fi.com/L4L3853VR)
 
@@ -8,74 +7,90 @@ This Blender addon allows you to import and export meshes and animations to and
 
 This software is licensed under the [GPLv3](https://www.gnu.org/licenses/gpl-3.0.html) license.
 
+# Installation
+For Blender 4.2 and higher, download the latest version from the [Blender Extensions](https://extensions.blender.org/add-ons/io-scene-psk-psa/) platform.
+
+For Blender 4.1 and lower, see [Legacy Compatibility](#legacy-compatibility).
+
 # Features
-* Full PSK/PSA import and export capabilities.
-* Non-standard file section data is supported for import only (vertex normals, extra UV channels, vertex colors, shape keys).
+* [Bone collections](https://docs.blender.org/manual/en/latest/animation/armatures/bones/bone_collections.html#bone-collections) can be excluded from PSK/PSA export (useful for excluding non-contributing bones such as IK controllers).
+* [Collection Exporters](https://docs.blender.org/manual/en/latest/scene_layout/collections/collections.html#exporters) for reliable, repeatable export workflow.
+* Non-standard model data (.pskx) is supported for import only (vertex normals, extra UV channels, vertex colors, shape keys).
+* Manual re-ordering of material slots on export.
+* Non-standard animation data is supported for import only (scale keys).
 * Fine-grained PSA sequence importing for efficient workflow when working with large PSA files.
 * PSA sequence metadata (e.g., frame rate) is preserved on import, allowing this data to be reused on export.
-* Specific bone collections can be excluded from PSK/PSA export (useful for excluding non-contributing bones such as IK controllers).
 * PSA sequences can be exported directly from actions or delineated using a scene's [timeline markers](https://docs.blender.org/manual/en/latest/animation/markers.html), pose markers, or NLA track strips, allowing direct use of the [NLA](https://docs.blender.org/manual/en/latest/editors/nla/index.html) when creating sequences.
-* Manual re-ordering of material slots when exporting multiple mesh objects.
-
-# Installation
-For Blender 4.2 and higher, it is recommended to download the latest version from the [Blender Extensions](https://extensions.blender.org/add-ons/io-scene-psk-psa/) platform.
-
-For Blender 4.1 and lower, you can install the addon manually by following these steps:
-
-1. Download the .zip file of the latest compatible version for your Blender version (see [Legacy Compatibility](#legacy-compatibility)).
-2. Open Blender.
-3. Navigate to the Blender Preferences (`Edit` > `Preferences`).
-4. Select the `Add-ons` tab.
-5. Click the `Install...` button.
-6. Select the .zip file that you downloaded earlier and click `Install Add-on`.
-7. Enable the newly added `Import-Export: PSK/PSA Importer/Exporter` addon.
-
-# Legacy Compatibility
-
-Below is a table of the latest addon versions that are compatible with older versions of Blender. These versions are no longer maintained and may contain bugs that have been fixed in newer versions. It is recommended to use the latest version of the addon for the best experience.
-
-Critical bug fixes may be issued for legacy addon versions that are under [Blender's LTS maintenance period](https://www.blender.org/download/lts/). Once the LTS period has ended, legacy addon versions will no longer be supported by the maintainers of this repository, although the releases will still be available for download.
-
-| Blender Version| Addon Version                                                                  | Long Term Support |
-|-|--------------------------------------------------------------------------------|-----------------|
-| [4.1](https://www.blender.org/download/releases/4-1/)        | [7.0.0](https://github.com/DarklightGames/io_scene_psk_psa/releases/tag/7.0.0) | No              |
-| [4.0](https://www.blender.org/download/releases/4-0/)        | [6.2.1](https://github.com/DarklightGames/io_scene_psk_psa/releases/tag/6.2.1) | No              |
-| [3.4 - 3.6](https://www.blender.org/download/lts/3-6/)       | [5.0.6](https://github.com/DarklightGames/io_scene_psk_psa/releases/tag/5.0.6) | June 2025       |
-| [2.93 - 3.3](https://www.blender.org/download/releases/3-3/) | [4.3.0](https://github.com/DarklightGames/io_scene_psk_psa/releases/tag/4.3.0) | September 2024  |
+* Compress exported sequences via resampling ratios or frame quotas.
 
 # Usage
-## Exporting a PSK
-1. Select the mesh objects you wish to export.
-2. Navigate to `File` > `Export` > `Unreal PSK (.psk)`.
-3. Enter the file name and click `Export`.
 
-## Importing a PSK/PSKX
+## Import
+
+### Importing a PSK/PSKX
 1. Navigate to `File` > `Import` > `Unreal PSK (.psk/.pskx)`.
 2. Select the PSK file you want to import and click `Import`.
 
-## Exporting a PSA
-1. Select the armature objects you wish to export.
-2. Navigate to `File` > `Export` > `Unreal PSA (.psa)`.
-3. Enter the file name and click `Export`.
-
-## Importing a PSA
+### Importing a PSA
 1. Select an armature that you want import animations for.
 2. Navigate to `File` > `Import` > `Unreal PSA (.psa)`.
 3. Select the PSA file you want to import.
 4. Select the sequences that you want to import and click `Import`.
 
+## Export
+It is highly recommended to use the provided [Collection Exporters](https://docs.blender.org/manual/en/latest/scene_layout/collections/collections.html#exporters) workflow, since it allows for highly reliable, repeatable exports of both PSK and PSA files. However, the traditional export workflow is available as well.
+
+### Exporting a PSK
+1. Select the mesh objects you wish to export.
+2. Navigate to `File` > `Export` > `Unreal PSK (.psk)`.
+3. Enter the file name and click `Export`.
+
+### Exporting a PSA
+1. Select the armature objects you wish to export.
+2. Navigate to `File` > `Export` > `Unreal PSA (.psa)`.
+3. Enter the file name and click `Export`.
+
 > Note that in order to see the imported actions applied to your armature, you must use the [Dope Sheet](https://docs.blender.org/manual/en/latest/editors/dope_sheet/introduction.html) or [Nonlinear Animation](https://docs.blender.org/manual/en/latest/editors/nla/introduction.html) editors.
 
 # FAQ
 
 ## Why can't I see the animations imported from my PSA?
-Simply importing an animation into the scene will not automatically apply the action to the armature. This is in part because a PSA can have multiple sequences imported from it, and also that it's generally bad form for importers to modify the scene when they don't need to.
+Simply importing an animation into the scene will not automatically apply the action to the armature. This is in part because a PSA can have multiple sequences imported from it, and also that it's generally bad form for importers to modify the scene in ways that the user may not expect.
 
 The PSA importer creates [Actions](https://docs.blender.org/manual/en/latest/animation/actions.html) for each of the selected sequences in the PSA. These actions can be applied to your armature via the [Action Editor](https://docs.blender.org/manual/en/latest/editors/dope_sheet/action.html) or [NLA Editor](https://docs.blender.org/manual/en/latest/editors/nla/index.html).
 
+## Why are imported PSKs too big/too small?
+The PSK format, unlike other more modern formats, has no explicit or implicit unit system. Each game has its own convention as to what the base distance unit will represent. As such, this addon makes no assumptions as to the unit scale of the imported PSKs. If you think that your models are being imported into Blender either too big or too small, there are a couple ways to remedy this.
+
+The method I prefer is to simply change the Blender [scene properties](https://docs.blender.org/manual/en/5.0/scene_layout/scene/properties.html#units) to match the unit system and scale for the game you're using. This is non-destructive and ensures that the unit scaling of any PSK or PSA exports from Blender will match the source file from which it was derived.
+
+The second option is to simply change the `Scale` value on the PSK import dialog. This will scale the armature by the factor provided. Note that this is more destructive, but may be preferable if you don't intend on exporting PSKs or PSAs to a game engine.
+
+## How do I control shading for PSK exports?
+The PSK format does not support vertex normals and instead uses [smoothing groups](https://en.wikipedia.org/wiki/Smoothing_group) to control shading. Note that a mesh's Custom Split Normals Data will be ignored when exporting to PSK. Therefore, the best way to control shading is to use sharp edges and the Edge Split modifier.
+
 ## Why are the mesh normals not accurate when importing a PSK extracted from [UE Viewer](https://www.gildor.org/en/projects/umodel)?
 If preserving the mesh normals of models is important for your workflow, it is *not recommended* to export PSK files from UE Viewer. This is because UE Viewer makes no attempt to reconstruct the original [smoothing groups](https://en.wikipedia.org/wiki/Smoothing_group). As a result, the normals of imported PSK files will be incorrect when imported into Blender and will need to be manually fixed.
 
-As a workaround, it is recommended to export [glTF](https://en.wikipedia.org/wiki/GlTF) meshes out of UE Viewer instead, since the glTF format has support for explicit normals and UE Viewer can correctly preserve the mesh normals on export. Note, however, that the imported glTF armature may have it's bones oriented incorrectly when imported into Blender. To mitigate this, you can combine the armature of PSK and the mesh of the glTF for best results.
+There is a [pull request](https://github.com/gildor2/UEViewer/pull/277) to add support for exporting explicit normals from UE Viewer, although UEViewer's maintainer has seemingly abandoned the project.
 
-There is also an open pull request to add support for exporting explicit normals from UE Viewer in the future: https://github.com/gildor2/UEViewer/pull/277.
+# Legacy Compatibility
+Below is a table of the latest addon versions that are compatible with older versions of Blender. These versions are no longer maintained and may contain bugs that have been fixed in newer versions. It is recommended to use the latest version of the addon for the best experience.
+
+| Blender Version| Addon Version |
+|-|-|
+| [4.1](https://www.blender.org/download/releases/4-1/)        | [7.0.0](https://github.com/DarklightGames/io_scene_psk_psa/releases/tag/7.0.0) |
+| [4.0](https://www.blender.org/download/releases/4-0/)        | [6.2.1](https://github.com/DarklightGames/io_scene_psk_psa/releases/tag/6.2.1) |
+| [3.4 - 3.6](https://www.blender.org/download/lts/3-6/)       | [5.0.6](https://github.com/DarklightGames/io_scene_psk_psa/releases/tag/5.0.6) |
+| [2.93 - 3.3](https://www.blender.org/download/releases/3-3/) | [4.3.0](https://github.com/DarklightGames/io_scene_psk_psa/releases/tag/4.3.0) |
+
+# Testing
+To execute the automated tests, run:
+
+```
+./test.sh
+````
+
+This will create a [Docker](https://www.docker.com/) container with and run the tests inside it. The tests are executed using [pytest](https://docs.pytest.org/en/stable/) and the results will be displayed in the terminal.
+
+For now, the tests are not exhaustive and primarily focus on sanity checking the most common use cases (PSK & PSA import). New tests will likely be made to cover new features and prevent further regressions of reported issues.

io_scene_psk_psa/__init__.py

@@ -1,15 +1,52 @@
-from bpy.app.handlers import persistent
+from .shared import (
+    types as shared_types,
+    helpers as shared_helpers,
+    dfs as shared_dfs,
+    ui as shared_ui,
+    operators as shared_operators,
+)
+from .psk import (
+    builder as psk_builder,
+    importer as psk_importer,
+    properties as psk_properties,
+    ui as psk_ui,
+) 
+from .psk.export import (
+    operators as psk_export_operators,
+    properties as psk_export_properties,
+    ui as psk_export_ui,
+)
+from .psk.import_ import (
+    operators as psk_import_operators,
+)
+from .psa import (
+    config as psa_config,
+    builder as psa_builder,
+    importer as psa_importer,
+    file_handlers as psa_file_handlers,
+)
+from .psa.export import (
+    properties as psa_export_properties,
+    ui as psa_export_ui,
+    operators as psa_export_operators,
+)
+from .psa.import_ import (
+    operators as psa_import_operators,
+    ui as psa_import_ui,
+    properties as psa_import_properties,
+)
 
-if 'bpy' in locals():
+_needs_reload = 'bpy' in locals()
+
+if _needs_reload:
     import importlib
 
-    importlib.reload(shared_data)
     importlib.reload(shared_helpers)
     importlib.reload(shared_types)
+    importlib.reload(shared_dfs)
+    importlib.reload(shared_ui)
+    importlib.reload(shared_operators)
 
-    importlib.reload(psk_data)
-    importlib.reload(psk_reader)
-    importlib.reload(psk_writer)
     importlib.reload(psk_builder)
     importlib.reload(psk_importer)
     importlib.reload(psk_properties)
@@ -19,10 +56,7 @@ if 'bpy' in locals():
     importlib.reload(psk_export_ui)
     importlib.reload(psk_import_operators)
 
-    importlib.reload(psa_data)
     importlib.reload(psa_config)
-    importlib.reload(psa_reader)
-    importlib.reload(psa_writer)
     importlib.reload(psa_builder)
     importlib.reload(psa_importer)
     importlib.reload(psa_export_properties)
@@ -31,44 +65,11 @@ if 'bpy' in locals():
     importlib.reload(psa_import_properties)
     importlib.reload(psa_import_operators)
     importlib.reload(psa_import_ui)
-else:
-    from .shared import data as shared_data, types as shared_types, helpers as shared_helpers
-    from .psk import data as psk_data, builder as psk_builder, writer as psk_writer, \
-    importer as psk_importer, properties as psk_properties
-    from .psk import reader as psk_reader, ui as psk_ui
-    from .psk.export import properties as psk_export_properties, ui as psk_export_ui, \
-        operators as psk_export_operators
-    from .psk.import_ import operators as psk_import_operators
-
-    from .psa import config as psa_config, data as psa_data, writer as psa_writer, reader as psa_reader, \
-        builder as psa_builder, importer as psa_importer
-    from .psa.export import properties as psa_export_properties, ui as psa_export_ui, \
-        operators as psa_export_operators
-    from .psa.import_ import operators as psa_import_operators
-    from .psa.import_ import ui as psa_import_ui, properties as psa_import_properties
+    importlib.reload(psa_file_handlers)
 
 import bpy
 from bpy.props import PointerProperty
 
-# TODO: just here so that it's not unreferenced and removed on save.
-if [shared_data, shared_helpers, psk_data, psk_reader, psk_writer, psk_builder, psk_importer, psa_data, psa_config,
-    psa_reader, psa_writer, psa_builder, psa_importer]:
-    pass
-
-classes = shared_types.classes +\
-          psk_properties.classes +\
-          psk_ui.classes +\
-          psk_import_operators.classes +\
-          psk_export_properties.classes +\
-          psk_export_operators.classes +\
-          psk_export_ui.classes + \
-          psa_export_properties.classes +\
-          psa_export_operators.classes +\
-          psa_export_ui.classes + \
-          psa_import_properties.classes +\
-          psa_import_operators.classes +\
-          psa_import_ui.classes
-
 
 def psk_export_menu_func(self, context):
     self.layout.operator(psk_export_operators.PSK_OT_export.bl_idname, text='Unreal PSK (.psk)')
@@ -86,46 +87,54 @@ def psa_import_menu_func(self, context):
     self.layout.operator(psa_import_operators.PSA_OT_import.bl_idname, text='Unreal PSA (.psa)')
 
 
+_modules = (
+    shared_types,
+    shared_ui,
+    shared_operators,
+    psk_properties,
+    psk_ui,
+    psk_import_operators,
+    psk_export_properties,
+    psk_export_operators,
+    psk_export_ui,
+    psa_export_properties,
+    psa_export_operators,
+    psa_export_ui,
+    psa_import_properties,
+    psa_import_operators,
+    psa_import_ui,
+    psa_file_handlers,
+)
+
 def register():
-    for cls in classes:
-        bpy.utils.register_class(cls)
+    for module in _modules:
+        module.register()
     bpy.types.TOPBAR_MT_file_export.append(psk_export_menu_func)
     bpy.types.TOPBAR_MT_file_import.append(psk_import_menu_func)
     bpy.types.TOPBAR_MT_file_export.append(psa_export_menu_func)
     bpy.types.TOPBAR_MT_file_import.append(psa_import_menu_func)
-    bpy.types.Material.psk = PointerProperty(type=psk_properties.PSX_PG_material)
-    bpy.types.Scene.psa_import = PointerProperty(type=psa_import_properties.PSA_PG_import)
-    bpy.types.Scene.psa_export = PointerProperty(type=psa_export_properties.PSA_PG_export)
-    bpy.types.Scene.psk_export = PointerProperty(type=psk_export_properties.PSK_PG_export)
-    bpy.types.Action.psa_export = PointerProperty(type=shared_types.PSX_PG_action_export)
+    setattr(bpy.types.Material, 'psk', PointerProperty(type=psk_properties.PSX_PG_material, options={'HIDDEN'}))
+    setattr(bpy.types.Scene, 'psx_export', PointerProperty(type=shared_types.PSX_PG_scene_export, options={'HIDDEN'}))
+    setattr(bpy.types.Scene, 'psa_import', PointerProperty(type=psa_import_properties.PSA_PG_import, options={'HIDDEN'}))
+    setattr(bpy.types.Scene, 'psa_export', PointerProperty(type=psa_export_properties.PSA_PG_export, options={'HIDDEN'}))
+    setattr(bpy.types.Scene, 'psk_export', PointerProperty(type=psk_export_properties.PSK_PG_export, options={'HIDDEN'}))
+    setattr(bpy.types.Action, 'psa_export', PointerProperty(type=shared_types.PSX_PG_action_export, options={'HIDDEN'}))
 
 
 def unregister():
-    del bpy.types.Material.psk
-    del bpy.types.Scene.psa_import
-    del bpy.types.Scene.psa_export
-    del bpy.types.Scene.psk_export
-    del bpy.types.Action.psa_export
+    delattr(bpy.types.Material, 'psk')
+    delattr(bpy.types.Scene, 'psx_export')
+    delattr(bpy.types.Scene, 'psa_import')
+    delattr(bpy.types.Scene, 'psa_export')
+    delattr(bpy.types.Scene, 'psk_export')
+    delattr(bpy.types.Action, 'psa_export')
     bpy.types.TOPBAR_MT_file_export.remove(psk_export_menu_func)
     bpy.types.TOPBAR_MT_file_import.remove(psk_import_menu_func)
     bpy.types.TOPBAR_MT_file_export.remove(psa_export_menu_func)
     bpy.types.TOPBAR_MT_file_import.remove(psa_import_menu_func)
-    for cls in reversed(classes):
-        bpy.utils.unregister_class(cls)
+    for module in reversed(_modules):
+        module.unregister()
 
 
 if __name__ == '__main__':
     register()
-
-
-@persistent
-def load_handler(dummy):
-    # Convert old `psa_sequence_fps` property to new `psa_export.fps` property.
-    # This is only needed for backwards compatibility with files that may have used older versions of the addon.
-    for action in bpy.data.actions:
-        if 'psa_sequence_fps' in action:
-            action.psa_export.fps = action['psa_sequence_fps']
-            del action['psa_sequence_fps']
-
-
-bpy.app.handlers.load_post.append(load_handler)

io_scene_psk_psa/blender_manifest.toml

@@ -1,18 +1,21 @@
 schema_version = "1.0.0"
 id = "io_scene_psk_psa"
-version = "7.1.0"
+version = "9.1.1"
 name = "Unreal PSK/PSA (.psk/.psa)"
 tagline = "Import and export PSK and PSA files used in Unreal Engine"
 maintainer = "Colin Basnett <cmbasnett@gmail.com>"
 type = "add-on"
 website = "https://github.com/DarklightGames/io_scene_psk_psa/"
 tags = ["Game Engine", "Import-Export"]
-blender_version_min = "4.2.0"
+blender_version_min = "5.0.0"
 # Optional: maximum supported Blender version
 # blender_version_max = "5.1.0"
 license = [
   "SPDX:GPL-3.0-or-later",
 ]
+wheels = [
+  './wheels/psk_psa_py-0.0.4-py3-none-any.whl'
+]
 
 [build]
 paths_exclude_pattern = [
@@ -24,4 +27,4 @@ paths_exclude_pattern = [
 ]
 
 [permissions]
-files = "Import/export PSK and PSA files from/to disk"
+files = "Read and write PSK and PSA files from and to disk"

io_scene_psk_psa/psa/builder.py

@@ -1,142 +1,191 @@
-from typing import Optional
+from bpy.types import Action, AnimData, Context, Object, PoseBone
 
-from bpy.types import Armature, Bone, Action, PoseBone
+from psk_psa_py.psa.data import Psa
+from typing import Tuple
+from mathutils import Matrix, Quaternion, Vector
 
-from .data import *
-from ..shared.helpers import *
+from ..shared.helpers import PsxBoneCollection, convert_bpy_quaternion_to_psx_quaternion, convert_vector_to_vector3, create_psx_bones, get_coordinate_system_transform
 
 
 class PsaBuildSequence:
     class NlaState:
         def __init__(self):
-            self.action: Optional[Action] = None
+            self.action: Action | None = None
             self.frame_start: int = 0
             self.frame_end: int = 0
 
-    def __init__(self):
+    def __init__(self, armature_object: Object, anim_data: AnimData):
+        self.armature_object = armature_object
+        self.anim_data = anim_data
         self.name: str = ''
         self.nla_state: PsaBuildSequence.NlaState = PsaBuildSequence.NlaState()
         self.compression_ratio: float = 1.0
         self.key_quota: int = 0
         self.fps: float = 30.0
+        self.group: str | None = None
 
 
 class PsaBuildOptions:
     def __init__(self):
-        self.animation_data: Optional[AnimData] = None
-        self.sequences: List[PsaBuildSequence] = []
+        self.armature_objects: list[Object] = []
+        self.animation_data: AnimData | None = None
+        self.sequences: list[PsaBuildSequence] = []
         self.bone_filter_mode: str = 'ALL'
-        self.bone_collection_indices: List[int] = []
-        self.should_enforce_bone_name_restrictions: bool = False
+        self.bone_collection_indices: list[PsxBoneCollection] = []
         self.sequence_name_prefix: str = ''
         self.sequence_name_suffix: str = ''
-        self.root_motion: bool = False
+        self.scale = 1.0
+        self.sampling_mode: str = 'INTERPOLATED'  # One of ('INTERPOLATED', 'SUBFRAME')
+        self.export_space = 'WORLD'
+        self.forward_axis = 'X'
+        self.up_axis = 'Z'
+        self.sequence_source = 'ACTIONS'  # One of ('ACTIONS', 'TIMELINE_MARKERS', 'NLA_STRIPS')
+    
+    @property
+    def bone_collection_primary_key(self) -> str:
+        return 'DATA' if self.sequence_source == 'ACTIVE_ACTION' else 'OBJECT'
 
 
-def _get_pose_bone_location_and_rotation(pose_bone: PoseBone, armature_object: Object, options: PsaBuildOptions):
-    if pose_bone.parent is not None:
-        pose_bone_matrix = pose_bone.matrix
-        pose_bone_parent_matrix = pose_bone.parent.matrix
-        pose_bone_matrix = pose_bone_parent_matrix.inverted() @ pose_bone_matrix
-    else:
-        if options.root_motion:
-            # Get the bone's pose matrix, taking the armature object's world matrix into account.
-            pose_bone_matrix = armature_object.matrix_world @ pose_bone.matrix
+class PsaExportBone:
+    def __init__(self,
+                    pose_bone: PoseBone | None,
+                    armature_object: Object | None,
+                    scale: Vector):
+        self.pose_bone = pose_bone
+        self.armature_object = armature_object
+        self.scale = scale
+    
+    @property
+    def is_armature_root_bone(self) -> bool:
+        return self.pose_bone is not None and self.pose_bone.parent is None
+    
+    @property
+    def is_attached_to_armature(self) -> bool:
+        return self.get_attached_armature() is not None
+    
+    def get_attached_armature(self) -> tuple[Object, PoseBone] | None:
+        if not self.is_armature_root_bone:
+            return None
+        assert self.armature_object is not None
+        match self.armature_object.parent_type:
+            case 'BONE':
+                parent_bone_name = self.armature_object.parent_bone
+                assert self.armature_object.parent is not None
+                parent_armature_object = self.armature_object.parent
+                assert parent_armature_object.pose is not None
+                parent_pose_bone = parent_armature_object.pose.bones.get(parent_bone_name)
+                if parent_pose_bone is None:
+                    return None
+                return (parent_armature_object, parent_pose_bone)
+            case _:
+                return None
+    
+    def get_attached_armature_transform(self) -> Matrix:
+        attached_armature, attached_pose_bone = self.get_attached_armature() or (None, None)
+        if attached_armature is None or attached_pose_bone is None:
+            return Matrix.Identity(4)
+        if attached_pose_bone.parent is not None:
+            attached_bone_matrix = attached_pose_bone.parent.matrix.inverted() @ attached_pose_bone.matrix
         else:
-            # Use the bind pose matrix for the root bone.
-            pose_bone_matrix = pose_bone.matrix
+            attached_bone_matrix = attached_armature.matrix_world @ attached_pose_bone.matrix
+        return attached_bone_matrix
+
+def _get_pose_bone_location_and_rotation(
+    pose_bone: PoseBone,
+    armature_object: Object,
+    export_bone: PsaExportBone,
+    export_space: str,
+    scale: Vector,
+    coordinate_system_transform: Matrix,
+) -> Tuple[Vector, Quaternion]:
+    if pose_bone.parent is not None:
+        pose_bone_matrix = pose_bone.parent.matrix.inverted() @ pose_bone.matrix
+    else:
+        # Root bone
+        # Get the bone's pose matrix and transform it into the export space.
+        # In the case of an 'ARMATURE' export space, this will be the inverse of armature object's world matrix.
+        # Otherwise, it will be the identity matrix.
+
+        if export_bone.is_attached_to_armature:
+            # Get the world space matrix of both this bone and the bone that we're attached to,
+            # then calculate a matrix relative to the attached bone.
+            world_matrix = armature_object.matrix_world @ pose_bone.matrix
+            assert export_bone.armature_object
+            my_parent = export_bone.armature_object.parent
+            assert my_parent
+            my_parent_bone = export_bone.armature_object.parent_bone
+            assert my_parent.pose
+            parent_pose_bone = my_parent.pose.bones[my_parent_bone]
+            parent_world_matrix = my_parent.matrix_world @ parent_pose_bone.matrix
+            pose_bone_matrix = parent_world_matrix.inverted() @ world_matrix
+        else:
+            match export_space:
+                case 'ARMATURE':
+                    pose_bone_matrix = pose_bone.matrix
+                case 'WORLD':
+                    pose_bone_matrix = armature_object.matrix_world @ pose_bone.matrix
+                case 'ROOT':
+                    pose_bone_matrix = Matrix.Identity(4)
+                case _:
+                    assert False, f'Invalid export space: {export_space}'
+            # The root bone is the only bone that should be transformed by the coordinate system transform, since all
+            # other bones are relative to their parent bones.
+            pose_bone_matrix = coordinate_system_transform @ pose_bone_matrix
 
     location = pose_bone_matrix.to_translation()
     rotation = pose_bone_matrix.to_quaternion().normalized()
 
     if pose_bone.parent is not None:
+        # Don't apply scale to the root bone of armatures if we have a false root.
+        # TODO: probably remove this?
+        location *= scale
         rotation.conjugate()
 
     return location, rotation
 
 
-def build_psa(context: bpy.types.Context, options: PsaBuildOptions) -> Psa:
-    active_object = context.view_layer.objects.active
+def build_psa(context: Context, options: PsaBuildOptions) -> Psa:
+
+    assert context.scene
+    assert context.window_manager
 
     psa = Psa()
 
-    armature_object = active_object
-    armature_data = typing.cast(Armature, armature_object.data)
-    bones: List[Bone] = list(iter(armature_data.bones))
+    armature_objects_for_bones = options.armature_objects
+    if options.sequence_source == 'ACTIVE_ACTION' and len(options.armature_objects) >= 2:
+        # Make sure that the data-block for all the selected armature objects is the same.
+        if any(map(lambda o: o.data != options.armature_objects[0].data, options.armature_objects[1:])):
+            raise RuntimeError('All armature objects must share the same data-block when exporting from the active action')
+        armature_objects_for_bones = [options.armature_objects[0]]
 
-    # The order of the armature bones and the pose bones is not guaranteed to be the same.
-    # As a result, we need to reconstruct the list of pose bones in the same order as the
-    # armature bones.
-    bone_names = [x.name for x in bones]
-    pose_bones = [(bone_names.index(bone.name), bone) for bone in armature_object.pose.bones]
-    pose_bones.sort(key=lambda x: x[0])
-    pose_bones = [x[1] for x in pose_bones]
-
-    # Get a list of all the bone indices and instigator bones for the bone filter settings.
-    export_bone_names = get_export_bone_names(armature_object, options.bone_filter_mode, options.bone_collection_indices)
-    bone_indices = [bone_names.index(x) for x in export_bone_names]
-
-    # Make the bone lists contain only the bones that are going to be exported.
-    bones = [bones[bone_index] for bone_index in bone_indices]
-    pose_bones = [pose_bones[bone_index] for bone_index in bone_indices]
-
-    # No bones are going to be exported.
-    if len(bones) == 0:
-        raise RuntimeError('No bones available for export')
-
-    # Check that all bone names are valid.
-    if options.should_enforce_bone_name_restrictions:
-        check_bone_names(map(lambda bone: bone.name, bones))
+    psx_bone_create_result = create_psx_bones(
+        armature_objects=armature_objects_for_bones,
+        export_space=options.export_space,
+        forward_axis=options.forward_axis,
+        up_axis=options.up_axis,
+        scale=options.scale,
+        bone_filter_mode=options.bone_filter_mode,
+        bone_collection_indices=options.bone_collection_indices,
+        bone_collection_primary_key=options.bone_collection_primary_key,
+    )
 
     # Build list of PSA bones.
-    for bone in bones:
-        psa_bone = Psa.Bone()
+    # Note that the PSA bones are just here to validate the hierarchy.
+    # The bind pose information is not used by the engine.
+    psa.bones = [bone.psx_bone for bone in psx_bone_create_result.bones]
 
-        try:
-            psa_bone.name = bytes(bone.name, encoding='windows-1252')
-        except UnicodeEncodeError:
-            raise RuntimeError(f'Bone name "{bone.name}" contains characters that cannot be encoded in the Windows-1252 codepage')
-
-        try:
-            parent_index = bones.index(bone.parent)
-            psa_bone.parent_index = parent_index
-            psa.bones[parent_index].children_count += 1
-        except ValueError:
-            psa_bone.parent_index = 0
-
-        if bone.parent is not None:
-            rotation = bone.matrix.to_quaternion().conjugated()
-            inverse_parent_rotation = bone.parent.matrix.to_quaternion().inverted()
-            parent_head = inverse_parent_rotation @ bone.parent.head
-            parent_tail = inverse_parent_rotation @ bone.parent.tail
-            location = (parent_tail - parent_head) + bone.head
-        else:
-            armature_local_matrix = armature_object.matrix_local
-            location = armature_local_matrix @ bone.head
-            bone_rotation = bone.matrix.to_quaternion().conjugated()
-            local_rotation = armature_local_matrix.to_3x3().to_quaternion().conjugated()
-            rotation = bone_rotation @ local_rotation
-            rotation.conjugate()
-
-        psa_bone.location.x = location.x
-        psa_bone.location.y = location.y
-        psa_bone.location.z = location.z
-
-        psa_bone.rotation.x = rotation.x
-        psa_bone.rotation.y = rotation.y
-        psa_bone.rotation.z = rotation.z
-        psa_bone.rotation.w = rotation.w
-
-        psa.bones.append(psa_bone)
+    # No bones are going to be exported.
+    if len(psa.bones) == 0:
+        raise RuntimeError('No bones available for export')
 
     # Add prefixes and suffices to the names of the export sequences and strip whitespace.
     for export_sequence in options.sequences:
         export_sequence.name = f'{options.sequence_name_prefix}{export_sequence.name}{options.sequence_name_suffix}'
         export_sequence.name = export_sequence.name.strip()
 
-    # Save the current action and frame so that we can restore the state once we are done.
+    # Save each armature object's current action and frame so that we can restore the state once we are done.
+    saved_armature_object_actions = {o: (o.animation_data.action if o.animation_data else None) for o in options.armature_objects}
     saved_frame_current = context.scene.frame_current
-    saved_action = options.animation_data.action
 
     # Now build the PSA sequences.
     # We actually alter the timeline frame and simply record the resultant pose bone matrices.
@@ -144,62 +193,172 @@ def build_psa(context: bpy.types.Context, options: PsaBuildOptions) -> Psa:
 
     context.window_manager.progress_begin(0, len(options.sequences))
 
-    for export_sequence_index, export_sequence in enumerate(options.sequences):
-        # Link the action to the animation data and update view layer.
-        options.animation_data.action = export_sequence.nla_state.action
-        context.view_layer.update()
+    coordinate_system_transform = get_coordinate_system_transform(options.forward_axis, options.up_axis)
 
+    for export_sequence_index, export_sequence in enumerate(options.sequences):
         frame_start = export_sequence.nla_state.frame_start
         frame_end = export_sequence.nla_state.frame_end
 
         # Calculate the frame step based on the compression factor.
         frame_extents = abs(frame_end - frame_start)
         frame_count_raw = frame_extents + 1
-        frame_count = max(export_sequence.key_quota, int(frame_count_raw * export_sequence.compression_ratio))
-
-        try:
-            frame_step = frame_extents / (frame_count - 1)
-        except ZeroDivisionError:
-            frame_step = 0.0
-
-        sequence_duration = frame_count_raw / export_sequence.fps
+        frame_count = max(1, max(export_sequence.key_quota, int(frame_count_raw * export_sequence.compression_ratio)))
+        frame_step = frame_extents / (frame_count - 1) if frame_count > 1 else 0.0
 
         # If this is a reverse sequence, we need to reverse the frame step.
         if frame_start > frame_end:
             frame_step = -frame_step
 
+        sequence_duration = frame_count_raw / export_sequence.fps
+
         psa_sequence = Psa.Sequence()
+        
         try:
             psa_sequence.name = bytes(export_sequence.name, encoding='windows-1252')
         except UnicodeEncodeError:
-            raise RuntimeError(f'Sequence name "{export_sequence.name}" contains characters that cannot be encoded in the Windows-1252 codepage')
+            raise RuntimeError(
+                f'Sequence name "{export_sequence.name}" contains characters that cannot be encoded in the Windows-1252 codepage')
+        
+        try:
+            if export_sequence.group is not None:
+                psa_sequence.group = bytes(export_sequence.group, encoding='windows-1252')
+        except UnicodeDecodeError:
+            raise RuntimeError(
+                f'Group name "{export_sequence.group} contains characters that cannot be encoded in the Windows-1252 codepage')
+        
         psa_sequence.frame_count = frame_count
         psa_sequence.frame_start_index = frame_start_index
         psa_sequence.fps = frame_count / sequence_duration
-        psa_sequence.bone_count = len(pose_bones)
+        psa_sequence.bone_count = len(psa.bones)
         psa_sequence.track_time = frame_count
         psa_sequence.key_reduction = 1.0
 
         frame = float(frame_start)
 
-        for _ in range(frame_count):
-            context.scene.frame_set(frame=int(frame), subframe=frame % 1.0)
+        # Link the action to the animation data and update view layer.
+        for armature_object in options.armature_objects:
+            if armature_object.animation_data:
+                armature_object.animation_data.action = export_sequence.nla_state.action
 
-            for pose_bone in pose_bones:
-                location, rotation = _get_pose_bone_location_and_rotation(pose_bone, armature_object, options)
+        assert context.view_layer
+        context.view_layer.update()
 
-                key = Psa.Key()
-                key.location.x = location.x
-                key.location.y = location.y
-                key.location.z = location.z
-                key.rotation.x = rotation.x
-                key.rotation.y = rotation.y
-                key.rotation.z = rotation.z
-                key.rotation.w = rotation.w
-                key.time = 1.0 / psa_sequence.fps
-                psa.keys.append(key)
+        def add_key(location: Vector, rotation: Quaternion):
+            key = Psa.Key()
+            key.location = convert_vector_to_vector3(location)
+            key.rotation = convert_bpy_quaternion_to_psx_quaternion(rotation)
+            key.time = 1.0 / psa_sequence.fps
+            psa.keys.append(key)
 
-            frame += frame_step
+        armature_scales: dict[Object, Vector] = {}
+
+        # Extract the scale from the world matrix of the evaluated armature object.
+        for armature_object in options.armature_objects:
+            evaluated_armature_object = armature_object.evaluated_get(context.evaluated_depsgraph_get())
+            _, _, scale = evaluated_armature_object.matrix_world.decompose()
+            scale *= options.scale
+            armature_scales[armature_object] = scale
+
+        # Create a list of export pose bones, in the same order as the bones as they appear in the armature.
+        # The object contains the pose bone, the armature object, and a pre-calculated scaling value to apply to the
+        # locations.
+        export_bones: list[PsaExportBone] = []
+
+        for bone in psx_bone_create_result.bones:
+            if bone.armature_object is None:
+                export_bone = PsaExportBone(None, None, Vector((1.0, 1.0, 1.0)))
+                export_bones.append(export_bone)
+                continue
+
+            assert bone.armature_object.pose
+            pose_bone = bone.armature_object.pose.bones[bone.psx_bone.name.decode('windows-1252')]
+
+            export_bones.append(PsaExportBone(pose_bone, bone.armature_object, armature_scales[bone.armature_object]))
+
+        match options.sampling_mode:
+            case 'INTERPOLATED':
+                # Used as a store for the last frame's pose bone locations and rotations.
+                last_frame: int | None = None
+                last_frame_bone_poses: list[tuple[Vector, Quaternion]] = []
+
+                next_frame: int | None = None
+                next_frame_bone_poses: list[tuple[Vector, Quaternion]] = []
+
+                for _ in range(frame_count):
+                    if last_frame is None or last_frame != int(frame):
+                        # Populate the bone poses for frame A.
+                        last_frame = int(frame)
+
+                        # TODO: simplify this code and make it easier to follow!
+                        if next_frame == last_frame:
+                            # Simply transfer the data from next_frame to the last_frame so that we don't need to
+                            # resample anything.
+                            last_frame_bone_poses = next_frame_bone_poses.copy()
+                        else:
+                            last_frame_bone_poses.clear()
+                            context.scene.frame_set(frame=last_frame)
+                            for export_bone in export_bones:
+                                location, rotation = _get_pose_bone_location_and_rotation(
+                                    export_bone.pose_bone,
+                                    export_bone.armature_object,
+                                    export_bone,
+                                    options.export_space,
+                                    export_bone.scale,
+                                    coordinate_system_transform=coordinate_system_transform
+                                )
+                                last_frame_bone_poses.append((location, rotation))
+
+                        next_frame = None
+                        next_frame_bone_poses.clear()
+
+                    # If this is not a subframe, just use the last frame's bone poses.
+                    if frame % 1.0 == 0:
+                        for i in range(len(export_bones)):
+                            add_key(*last_frame_bone_poses[i])
+                    else:
+                        # Otherwise, this is a subframe, so we need to interpolate the pose between the next frame and the last frame.
+                        if next_frame is None:
+                            next_frame = last_frame + 1
+                            context.scene.frame_set(frame=next_frame)
+                            for export_bone in export_bones:
+                                location, rotation = _get_pose_bone_location_and_rotation(
+                                    pose_bone=export_bone.pose_bone,
+                                    armature_object=export_bone.armature_object,
+                                    export_bone=export_bone,
+                                    export_space=options.export_space,
+                                    scale=export_bone.scale,
+                                    coordinate_system_transform=coordinate_system_transform,
+                                )
+                                next_frame_bone_poses.append((location, rotation))
+
+                        factor = frame % 1.0
+
+                        for i in range(len(export_bones)):
+                            last_location, last_rotation = last_frame_bone_poses[i]
+                            next_location, next_rotation = next_frame_bone_poses[i]
+
+                            location = last_location.lerp(next_location, factor)
+                            rotation = last_rotation.slerp(next_rotation, factor)
+
+                            add_key(location, rotation)
+
+                    frame += frame_step
+            case 'SUBFRAME':
+                for _ in range(frame_count):
+                    context.scene.frame_set(frame=int(frame), subframe=frame % 1.0)
+
+                    for export_bone in export_bones:
+                        location, rotation = _get_pose_bone_location_and_rotation(
+                            pose_bone=export_bone.pose_bone,
+                            armature_object=export_bone.armature_object,
+                            export_bone=export_bone,
+                            export_space=options.export_space,
+                            scale=export_bone.scale,
+                            coordinate_system_transform=coordinate_system_transform,
+                        )
+                        add_key(location, rotation)
+
+                    frame += frame_step
 
         frame_start_index += frame_count
 
@@ -207,8 +366,11 @@ def build_psa(context: bpy.types.Context, options: PsaBuildOptions) -> Psa:
 
         context.window_manager.progress_update(export_sequence_index)
 
-    # Restore the previous action & frame.
-    options.animation_data.action = saved_action
+    # Restore the previous actions & frame.
+    for armature_object, action in saved_armature_object_actions.items():
+        assert armature_object.animation_data
+        armature_object.animation_data.action = action
+
     context.scene.frame_set(saved_frame_current)
 
     context.window_manager.progress_end()

io_scene_psk_psa/psa/config.py

@@ -1,8 +1,5 @@
 import re
 from configparser import ConfigParser
-from typing import Dict
-
-from .reader import PsaReader
 
 REMOVE_TRACK_LOCATION = (1 << 0)
 REMOVE_TRACK_ROTATION = (1 << 1)
@@ -10,7 +7,7 @@ REMOVE_TRACK_ROTATION = (1 << 1)
 
 class PsaConfig:
     def __init__(self):
-        self.sequence_bone_flags: Dict[str, Dict[int, int]] = dict()
+        self.sequence_bone_flags: dict[str, dict[int, int]] = dict()
 
 
 def _load_config_file(file_path: str) -> ConfigParser:
@@ -28,7 +25,7 @@ def _load_config_file(file_path: str) -> ConfigParser:
     with open(file_path, 'r') as f:
         lines = f.read().split('\n')
 
-    lines = [re.sub(r'^\s*(\w+)\s*$', r'\1=', line) for line in lines]
+    lines = [re.sub(r'^\s*([^=]+)\s*$', r'\1=', line) for line in lines]
 
     contents = '\n'.join(lines)
 
@@ -50,19 +47,20 @@ def _get_bone_flags_from_value(value: str) -> int:
             return 0
 
 
-def read_psa_config(psa_reader: PsaReader, file_path: str) -> PsaConfig:
+def read_psa_config(psa_sequence_names: list[str], file_path: str) -> PsaConfig:
     psa_config = PsaConfig()
 
     config = _load_config_file(file_path)
 
     if config.has_section('RemoveTracks'):
         for key, value in config.items('RemoveTracks'):
-            match = re.match(f'^(.+)\.(\d+)$', key)
+            match = re.match(rf'^(.+)\.(\d+)$', key)
+            if not match:
+                continue
             sequence_name = match.group(1)
 
             # Map the sequence name onto the actual sequence name in the PSA file.
             try:
-                psa_sequence_names = list(psa_reader.sequences.keys())
                 lowercase_sequence_names = [sequence_name.lower() for sequence_name in psa_sequence_names]
                 sequence_name = psa_sequence_names[lowercase_sequence_names.index(sequence_name.lower())]
             except ValueError:

io_scene_psk_psa/psa/data.py

@@ -1,64 +0,0 @@
-import typing
-from collections import OrderedDict
-from typing import List
-
-from ..shared.data import *
-
-'''
-Note that keys are not stored within the Psa object.
-Use the PsaReader::get_sequence_keys to get the keys for a sequence.
-'''
-
-
-class Psa:
-    class Bone(Structure):
-        _fields_ = [
-            ('name', c_char * 64),
-            ('flags', c_int32),
-            ('children_count', c_int32),
-            ('parent_index', c_int32),
-            ('rotation', Quaternion),
-            ('location', Vector3),
-            ('padding', c_char * 16)
-        ]
-
-    class Sequence(Structure):
-        _fields_ = [
-            ('name', c_char * 64),
-            ('group', c_char * 64),
-            ('bone_count', c_int32),
-            ('root_include', c_int32),
-            ('compression_style', c_int32),
-            ('key_quotum', c_int32),
-            ('key_reduction', c_float),
-            ('track_time', c_float),
-            ('fps', c_float),
-            ('start_bone', c_int32),
-            ('frame_start_index', c_int32),
-            ('frame_count', c_int32)
-        ]
-
-    class Key(Structure):
-        _fields_ = [
-            ('location', Vector3),
-            ('rotation', Quaternion),
-            ('time', c_float)
-        ]
-
-        @property
-        def data(self):
-            yield self.rotation.w
-            yield self.rotation.x
-            yield self.rotation.y
-            yield self.rotation.z
-            yield self.location.x
-            yield self.location.y
-            yield self.location.z
-
-        def __repr__(self) -> str:
-            return repr((self.location, self.rotation, self.time))
-
-    def __init__(self):
-        self.bones: List[Psa.Bone] = []
-        self.sequences: typing.OrderedDict[str, Psa.Sequence] = OrderedDict()
-        self.keys: List[Psa.Key] = []

io_scene_psk_psa/psa/export/properties.py

@@ -1,45 +1,92 @@
 import re
 import sys
 from fnmatch import fnmatch
-from typing import List, Optional
-
-from bpy.props import BoolProperty, PointerProperty, EnumProperty, FloatProperty, CollectionProperty, IntProperty, \
-    StringProperty
+from typing import Sequence
+import bpy
+from bpy.props import (
+    BoolProperty,
+    EnumProperty,
+    FloatProperty,
+    CollectionProperty,
+    IntProperty,
+    StringProperty,
+)
 from bpy.types import PropertyGroup, Object, Action, AnimData, Context
 
-from ...shared.types import PSX_PG_bone_collection_list_item
+from ...shared.dfs import dfs_view_layer_objects
+from ...shared.helpers import populate_bone_collection_list
+from ...shared.types import TransformMixin, ExportSpaceMixin, PsxBoneExportMixin, TransformSourceMixin
 
 
 def psa_export_property_group_animation_data_override_poll(_context, obj):
     return obj.animation_data is not None
 
 
-empty_set = set()
+class PsaExportSequenceMixin(PropertyGroup):
+    name: StringProperty(name='Name')
+    is_selected: BoolProperty(name='Selected', default=True)
+    frame_start: IntProperty(name='Start Frame', options={'HIDDEN'})
+    frame_end: IntProperty(name='End Frame', options={'HIDDEN'})
+    group: StringProperty(name='Group')
+    action_name: StringProperty(name='Action Name',default='', options={'HIDDEN'})
+    armature_object_name: StringProperty(name='Armature Object Name',default='', options={'HIDDEN'})
+    marker_index: IntProperty(name='Marker Index',default=-1, options={'HIDDEN'})
+    is_pose_marker: BoolProperty(name='Is Pose Marker',default=False, options={'HIDDEN'})
+
+    @property
+    def action(self) -> Action | None:
+        """Get the action associated with this sequence (if any)."""
+        return bpy.data.actions.get(self.action_name) if self.action_name else None
+
+    @property
+    def armature_object(self) -> Object | None:
+        """Get the armature object associated with this sequence (if any)."""
+        return bpy.data.objects.get(self.armature_object_name) if self.armature_object_name else None
+    
+    @property
+    def is_reversed(self) -> bool:
+        """Check if the sequence is reversed (end frame before start frame)."""
+        return self.frame_end < self.frame_start
+
+    def __hash__(self) -> int:
+        return hash(self.name)
 
 
-class PSA_PG_export_action_list_item(PropertyGroup):
-    action: PointerProperty(type=Action)
-    name: StringProperty()
-    is_selected: BoolProperty(default=True)
-    frame_start: IntProperty(options={'HIDDEN'})
-    frame_end: IntProperty(options={'HIDDEN'})
-    is_pose_marker: BoolProperty(options={'HIDDEN'})
+class PSA_PG_export_sequence(PsaExportSequenceMixin):
+    pass
 
 
-class PSA_PG_export_timeline_markers(PropertyGroup):  # TODO: rename this to singular
-    marker_index: IntProperty()
-    name: StringProperty()
-    is_selected: BoolProperty(default=True)
-    frame_start: IntProperty(options={'HIDDEN'})
-    frame_end: IntProperty(options={'HIDDEN'})
+def get_sequences_from_name_and_frame_range(name: str, frame_start: int, frame_end: int):
+    # Check for loop
+    anims: list[tuple[str, int, int]] = []
+    loop_pattern = r'\@(\d+)\:(.+)'
+    loop_match = re.match(loop_pattern, name)
+    if loop_match:
+        frame_count = max(1, int(loop_match.group(1)))
+        sequence_name = loop_match.group(2)
+        iteration = 0
+        frame = frame_start
+        while frame + frame_count <= frame_end:
+            output_name = sequence_name.format(index=iteration)
+            iteration_frame_start = frame
+            iteration_frame_end = frame + frame_count - 1
+            anims.append((output_name, iteration_frame_start, iteration_frame_end))
+            frame += frame_count
+            iteration += 1
+    else:
+        # If not, just treat it as a single animation, but parse for the reverse pattern as well.
+        anims.append((name, frame_start, frame_end))
 
-
-class PSA_PG_export_nla_strip_list_item(PropertyGroup):
-    name: StringProperty()
-    action: PointerProperty(type=Action)
-    frame_start: FloatProperty()
-    frame_end: FloatProperty()
-    is_selected: BoolProperty(default=True)
+    for (name, frame_start, frame_end) in anims:
+        reversed_pattern = r'(.+)/(.+)'
+        reversed_match = re.match(reversed_pattern, name)
+        if reversed_match:
+            forward_name = reversed_match.group(1)
+            backwards_name = reversed_match.group(2)
+            yield forward_name, frame_start, frame_end
+            yield backwards_name, frame_end, frame_start
+        else:
+            yield name, frame_start, frame_end
 
 
 def nla_track_update_cb(self: 'PSA_PG_export', context: Context) -> None:
@@ -52,27 +99,25 @@ def nla_track_update_cb(self: 'PSA_PG_export', context: Context) -> None:
             return
         nla_track = animation_data.nla_tracks[self.nla_track_index]
         for nla_strip in nla_track.strips:
-            strip: PSA_PG_export_nla_strip_list_item = self.nla_strip_list.add()
-            strip.action = nla_strip.action
-            strip.name = nla_strip.name
-            strip.frame_start = nla_strip.frame_start
-            strip.frame_end = nla_strip.frame_end
+            for sequence_name, frame_start, frame_end in get_sequences_from_name_and_frame_range(nla_strip.name, nla_strip.frame_start, nla_strip.frame_end):
+                strip: PSA_PG_export_sequence = self.nla_strip_list.add()
+                strip.action_name = nla_strip.action
+                strip.name = sequence_name
+                strip.frame_start = frame_start
+                strip.frame_end = frame_end
 
 
-def get_animation_data(pg: 'PSA_PG_export', context: Context) -> Optional[AnimData]:
+def get_animation_data(pg: 'PSA_PG_export', context: Context) -> AnimData | None:
     animation_data_object = context.object
-    if pg.should_override_animation_data:
-        animation_data_object = pg.animation_data_override
     return animation_data_object.animation_data if animation_data_object else None
 
 
 def nla_track_search_cb(self, context: Context, edit_text: str):
     pg = getattr(context.scene, 'psa_export')
     animation_data = get_animation_data(pg, context)
-    if animation_data is None:
-        return
-    for index, nla_track in enumerate(animation_data.nla_tracks):
-        yield f'{index} - {nla_track.name}'
+    if animation_data is not None:
+        for index, nla_track in enumerate(animation_data.nla_tracks):
+            yield f'{index} - {nla_track.name}'
 
 
 def animation_data_override_update_cb(self: 'PSA_PG_export', context: Context):
@@ -80,40 +125,59 @@ def animation_data_override_update_cb(self: 'PSA_PG_export', context: Context):
     self.nla_track = ''
 
 
-class PSA_PG_export(PropertyGroup):
-    root_motion: BoolProperty(
-        name='Root Motion',
-        options=empty_set,
-        default=False,
-        description='When enabled, the root bone will be transformed as it appears in the scene.\n\n'
-                    'You might want to disable this if you are exporting an animation for an armature that is '
-                    'attached to another object, such as a weapon or a shield',
-    )
-    should_override_animation_data: BoolProperty(
-        name='Override Animation Data',
-        options=empty_set,
-        default=False,
-        description='Use the animation data from a different object instead of the selected object',
-        update=animation_data_override_update_cb,
-    )
-    animation_data_override: PointerProperty(
-        type=Object,
-        update=animation_data_override_update_cb,
-        poll=psa_export_property_group_animation_data_override_poll
-    )
+sequence_source_items = (
+    ('ACTIONS', 'Actions', 'Sequences will be exported using actions', 'ACTION', 0),
+    ('TIMELINE_MARKERS', 'Timeline Markers', 'Sequences are delineated by scene timeline markers', 'MARKER_HLT', 1),
+    ('NLA_TRACK_STRIPS', 'NLA Track Strips', 'Sequences are delineated by the start & end times of strips on the selected NLA track', 'NLA', 2),
+    ('ACTIVE_ACTION', 'Active Action', 'The active action will be exported for each selected armature', 'ACTION', 3),
+)
+
+fps_source_items = (
+    ('SCENE', 'Scene', '', 'SCENE_DATA', 0),
+    ('ACTION_METADATA', 'Action Metadata', 'The frame rate will be determined by action\'s FPS property found in the PSA Export panel.\n\nIf the Sequence Source is Timeline Markers, the lowest value of all contributing actions will be used', 'ACTION', 1),
+    ('CUSTOM', 'Custom', '', 2)
+)
+
+compression_ratio_source_items = (
+    ('ACTION_METADATA', 'Action Metadata', 'The compression ratio will be determined by action\'s Compression Ratio property found in the PSA Export panel.\n\nIf the Sequence Source is Timeline Markers, the lowest value of all contributing actions will be used', 'ACTION', 1),
+    ('CUSTOM', 'Custom', '', 2)
+)
+
+sampling_mode_items = (
+    ('INTERPOLATED', 'Interpolated', 'Sampling is performed by interpolating the evaluated bone poses from the adjacent whole frames.', 'INTERPOLATED', 0),
+    ('SUBFRAME', 'Subframe', 'Sampling is performed by evaluating the bone poses at the subframe time.\n\nNot recommended unless you are also animating with subframes enabled.', 'SUBFRAME', 1),
+)
+
+group_source_items = (
+    ('ACTIONS', 'Actions', '', 0),
+    ('CUSTOM', 'Custom', '', 1),
+)
+
+
+def sequence_source_update_cb(self: 'PSA_PG_export', context: Context) -> None:
+    armature_objects = []
+    assert context.view_layer
+    for dfs_object in dfs_view_layer_objects(context.view_layer):
+        if dfs_object.obj.type == 'ARMATURE' and dfs_object.is_selected:
+            armature_objects.append(dfs_object.obj)
+
+    populate_bone_collection_list(
+        self.bone_collection_list,
+        armature_objects,
+        primary_key='DATA' if self.sequence_source == 'ACTIVE_ACTION' else 'OBJECT')
+
+
+class PsaExportMixin(PropertyGroup, TransformMixin, ExportSpaceMixin, PsxBoneExportMixin, TransformSourceMixin):
     sequence_source: EnumProperty(
         name='Source',
-        options=empty_set,
+        options=set(),
         description='',
-        items=(
-            ('ACTIONS', 'Actions', 'Sequences will be exported using actions', 'ACTION', 0),
-            ('TIMELINE_MARKERS', 'Timeline Markers', 'Sequences are delineated by scene timeline markers', 'MARKER_HLT', 1),
-            ('NLA_TRACK_STRIPS', 'NLA Track Strips', 'Sequences are delineated by the start & end times of strips on the selected NLA track', 'NLA', 2)
-        )
+        items=sequence_source_items,
+        update=sequence_source_update_cb,
     )
     nla_track: StringProperty(
         name='NLA Track',
-        options=empty_set,
+        options=set(),
         description='',
         search=nla_track_search_cb,
         update=nla_track_update_cb
@@ -121,42 +185,30 @@ class PSA_PG_export(PropertyGroup):
     nla_track_index: IntProperty(name='NLA Track Index', default=-1)
     fps_source: EnumProperty(
         name='FPS Source',
-        options=empty_set,
+        options=set(),
         description='',
-        items=(
-            ('SCENE', 'Scene', '', 'SCENE_DATA', 0),
-            ('ACTION_METADATA', 'Action Metadata', 'The frame rate will be determined by action\'s FPS property found in the PSA Export panel.\n\nIf the Sequence Source is Timeline Markers, the lowest value of all contributing actions will be used', 'ACTION', 1),
-            ('CUSTOM', 'Custom', '', 2)
-        )
+        items=fps_source_items,
     )
-    fps_custom: FloatProperty(default=30.0, min=sys.float_info.epsilon, soft_min=1.0, options=empty_set, step=100,
-                              soft_max=60.0)
-    action_list: CollectionProperty(type=PSA_PG_export_action_list_item)
+    fps_custom: FloatProperty(default=30.0, min=sys.float_info.epsilon, soft_min=1.0, options=set(), step=100, soft_max=60.0)
+    compression_ratio_source: EnumProperty(
+        name='Compression Ratio Source',
+        options=set(),
+        description='',
+        items=compression_ratio_source_items,
+    )
+    compression_ratio_custom: FloatProperty(default=1.0, min=0.0, max=1.0, subtype='FACTOR', description='The key sampling ratio of the exported sequence.\n\nA compression ratio of 1.0 will export all frames, while a compression ratio of 0.5 will export half of the frames')
+
+    action_list: CollectionProperty(type=PSA_PG_export_sequence)
     action_list_index: IntProperty(default=0)
-    marker_list: CollectionProperty(type=PSA_PG_export_timeline_markers)
+    marker_list: CollectionProperty(type=PSA_PG_export_sequence)
     marker_list_index: IntProperty(default=0)
-    nla_strip_list: CollectionProperty(type=PSA_PG_export_nla_strip_list_item)
+    nla_strip_list: CollectionProperty(type=PSA_PG_export_sequence)
     nla_strip_list_index: IntProperty(default=0)
-    bone_filter_mode: EnumProperty(
-        name='Bone Filter',
-        options=empty_set,
-        description='',
-        items=(
-            ('ALL', 'All', 'All bones will be exported.'),
-            ('BONE_COLLECTIONS', 'Bone Collections', 'Only bones belonging to the selected bone collections and their '
-             'ancestors will be exported.'),
-        )
-    )
-    bone_collection_list: CollectionProperty(type=PSX_PG_bone_collection_list_item)
-    bone_collection_list_index: IntProperty(default=0, name='', description='')
-    should_enforce_bone_name_restrictions: BoolProperty(
-        default=False,
-        name='Enforce Bone Name Restrictions',
-        description='Bone names restrictions will be enforced. Note that bone names without properly formatted names '
-                    'may not be able to be referenced in-engine'
-    )
-    sequence_name_prefix: StringProperty(name='Prefix', options=empty_set)
-    sequence_name_suffix: StringProperty(name='Suffix', options=empty_set)
+    active_action_list: CollectionProperty(type=PSA_PG_export_sequence)
+    active_action_list_index: IntProperty(default=0)
+
+    sequence_name_prefix: StringProperty(name='Prefix', options=set())
+    sequence_name_suffix: StringProperty(name='Suffix', options=set())
     sequence_filter_name: StringProperty(
         default='',
         name='Filter by Name',
@@ -165,27 +217,49 @@ class PSA_PG_export(PropertyGroup):
     sequence_use_filter_invert: BoolProperty(
         default=False,
         name='Invert',
-        options=empty_set,
+        options=set(),
         description='Invert filtering (show hidden items, and vice versa)')
     sequence_filter_asset: BoolProperty(
         default=False,
         name='Show assets',
-        options=empty_set,
+        options=set(),
         description='Show actions that belong to an asset library')
     sequence_filter_pose_marker: BoolProperty(
         default=True,
         name='Show pose markers',
-        options=empty_set)
-    sequence_use_filter_sort_reverse: BoolProperty(default=True, options=empty_set)
+        options=set())
+    sequence_use_filter_sort_reverse: BoolProperty(default=True, options=set())
     sequence_filter_reversed: BoolProperty(
         default=True,
-        options=empty_set,
+        options=set(),
         name='Show Reversed',
         description='Show reversed sequences'
     )
+    sampling_mode: EnumProperty(
+        name='Sampling Mode',
+        options=set(),
+        description='The method by which frames are sampled',
+        items=sampling_mode_items,
+        default='INTERPOLATED'
+    )
+    group_source: EnumProperty(
+        name='Group Source',
+        options=set(),
+        description='The source of the exported sequence\'s group property',
+        items=group_source_items,
+        default='ACTIONS'
+    )
+    group_custom: StringProperty(
+        name='Group',
+        options=set(),
+        description='The group to apply to all exported sequences. Only applicable when Group Source is Custom.'
+    )
+
+class PSA_PG_export(PsaExportMixin):
+    pass
 
 
-def filter_sequences(pg: PSA_PG_export, sequences) -> List[int]:
+def filter_sequences(pg: PsaExportMixin, sequences: Sequence[PsaExportSequenceMixin]) -> list[int]:
     bitflag_filter_item = 1 << 30
     flt_flags = [bitflag_filter_item] * len(sequences)
 
@@ -202,25 +276,27 @@ def filter_sequences(pg: PSA_PG_export, sequences) -> List[int]:
 
     if not pg.sequence_filter_asset:
         for i, sequence in enumerate(sequences):
-            if hasattr(sequence, 'action') and sequence.action is not None and sequence.action.asset_data is not None:
+            if sequence.action is not None and sequence.action.asset_data is not None:
                 flt_flags[i] &= ~bitflag_filter_item
 
     if not pg.sequence_filter_pose_marker:
         for i, sequence in enumerate(sequences):
-            if hasattr(sequence, 'is_pose_marker') and sequence.is_pose_marker:
+            if sequence.is_pose_marker:
                 flt_flags[i] &= ~bitflag_filter_item
 
     if not pg.sequence_filter_reversed:
         for i, sequence in enumerate(sequences):
-            if sequence.frame_start > sequence.frame_end:
+            if sequence.is_reversed:
                 flt_flags[i] &= ~bitflag_filter_item
 
     return flt_flags
 
 
-classes = (
-    PSA_PG_export_action_list_item,
-    PSA_PG_export_timeline_markers,
-    PSA_PG_export_nla_strip_list_item,
+_classes = (
+    PSA_PG_export_sequence,
     PSA_PG_export,
 )
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)
+

io_scene_psk_psa/psa/export/properties.pyi

@@ -0,0 +1,68 @@
+from bpy.types import PropertyGroup, Object, Action
+
+from ...shared.types import BpyCollectionProperty, TransformMixin, ExportSpaceMixin, PsxBoneExportMixin, TransformSourceMixin
+
+class PsaExportSequenceMixin(PropertyGroup):
+    name: str
+    is_selected: bool
+    frame_start: int
+    frame_end: int
+    group: str
+    action_name: str
+    armature_object_name: str
+    marker_index: int
+    is_pose_marker: bool
+
+    @property
+    def action(self) -> Action | None: ...
+
+    @property
+    def armature_object(self) -> Object | None: ...
+
+    @property
+    def is_reversed(self) -> bool: ...
+
+
+class PSA_PG_export_sequence(PsaExportSequenceMixin):
+    """Concrete type for PSA export sequences."""
+    pass
+
+
+class PsaExportMixin(PropertyGroup, TransformMixin, ExportSpaceMixin, PsxBoneExportMixin, TransformSourceMixin):
+    sequence_source: str
+    nla_track: str
+    nla_track_index: int
+    fps_source: str
+    fps_custom: float
+    compression_ratio_source: str
+    compression_ratio_custom: float
+    action_list: BpyCollectionProperty[PSA_PG_export_sequence]
+    action_list_index: int
+    marker_list: BpyCollectionProperty[PSA_PG_export_sequence]
+    marker_list_index: int
+    nla_strip_list: BpyCollectionProperty[PSA_PG_export_sequence]
+    nla_strip_list_index: int
+    active_action_list: BpyCollectionProperty[PSA_PG_export_sequence]
+    active_action_list_index: int
+    sequence_name_prefix: str
+    sequence_name_suffix: str
+    sequence_filter_name: str
+    sequence_use_filter_invert: bool
+    sequence_filter_asset: bool
+    sequence_filter_pose_marker: bool
+    sequence_use_filter_sort_reverse: bool
+    sequence_filter_reversed: bool
+    sampling_mode: str
+    group_source: str
+    group_custom: str
+
+
+class PSA_PG_export(PsaExportMixin):
+    pass
+
+
+def get_sequences_from_name_and_frame_range(name: str, frame_start: int, frame_end: int):
+    pass
+
+def filter_sequences(pg: PsaExportMixin, sequences) -> list[int]:
+    pass

io_scene_psk_psa/psa/export/ui.py

@@ -1,19 +1,21 @@
-from typing import cast
+from typing import cast as typing_cast
 
 from bpy.types import UIList
 
-from .properties import PSA_PG_export_action_list_item, filter_sequences
+from .properties import PsaExportSequenceMixin, filter_sequences
 
 
 class PSA_UL_export_sequences(UIList):
+    bl_idname = 'PSA_UL_export_sequences'
 
-    def __init__(self):
-        super(PSA_UL_export_sequences, self).__init__()
+    def __init__(self, *args, **kwargs):
+        super(PSA_UL_export_sequences, self).__init__(*args, **kwargs)
         # Show the filtering options by default.
         self.use_filter_show = True
 
     def draw_item(self, context, layout, data, item, icon, active_data, active_propname, index):
-        item = cast(PSA_PG_export_action_list_item, item)
+        item = typing_cast(PsaExportSequenceMixin, item)
+
         is_pose_marker = hasattr(item, 'is_pose_marker') and item.is_pose_marker
         layout.prop(item, 'is_selected', icon_only=True, text=item.name)
         if hasattr(item, 'action') and item.action is not None and item.action.asset_data is not None:
@@ -21,10 +23,13 @@ class PSA_UL_export_sequences(UIList):
 
         row = layout.row(align=True)
         row.alignment = 'RIGHT'
-        if item.frame_end < item.frame_start:
-            row.label(text='', icon='FRAME_PREV')
-        if is_pose_marker:
-            row.label(text=item.action.name, icon='PMARKER')
+
+        row.label(text=str(abs(item.frame_end - item.frame_start) + 1), icon='FRAME_PREV' if item.is_reversed else 'KEYFRAME')
+
+        if item.armature_object is not None:
+            row.label(text=item.armature_object.name, icon='ARMATURE_DATA')
+
+        # row.label(text=item.action.name, icon='PMARKER' if is_pose_marker else 'ACTION_DATA')
 
     def draw_filter(self, context, layout):
         pg = getattr(context.scene, 'psa_export')
@@ -47,6 +52,10 @@ class PSA_UL_export_sequences(UIList):
         return flt_flags, flt_neworder
 
 
-classes = (
+_classes = (
     PSA_UL_export_sequences,
 )
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)
+

io_scene_psk_psa/psa/file_handlers.py

@@ -0,0 +1,24 @@
+from bpy.types import Context
+from bpy.types import FileHandler
+
+from .import_.operators import PSA_OT_import_drag_and_drop
+from .export.operators import PSA_OT_export_collection
+
+class PSA_FH_file_handler(FileHandler):
+    bl_idname = 'PSA_FH_file_handler'
+    bl_label = 'Unreal PSA'
+    bl_import_operator = PSA_OT_import_drag_and_drop.bl_idname
+    bl_export_operator = PSA_OT_export_collection.bl_idname
+    bl_file_extensions = '.psa'
+
+    @classmethod
+    def poll_drop(cls, context: Context) -> bool:
+        return context.area is not None and context.area.type == 'VIEW_3D'
+
+
+_classes = (
+    PSA_FH_file_handler,
+)
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)

io_scene_psk_psa/psa/import_/operators.py

@@ -1,18 +1,29 @@
 import os
 from pathlib import Path
+from typing import Iterable
 
-from bpy.props import StringProperty
-from bpy.types import Operator, Event, Context, FileHandler
+from bpy.props import CollectionProperty, StringProperty
+from bpy.types import Context, Event, Object, Operator, OperatorFileListElement
 from bpy_extras.io_utils import ImportHelper
 
-from .properties import get_visible_sequences
+from .properties import PsaImportMixin, get_visible_sequences
 from ..config import read_psa_config
-from ..importer import import_psa, PsaImportOptions
-from ..reader import PsaReader
+from ..importer import BoneMapping, PsaImportOptions, import_psa
+from psk_psa_py.psa.reader import PsaReader
 
 
-class PSA_OT_import_sequences_from_text(Operator):
-    bl_idname = 'psa_import.sequences_select_from_text'
+def psa_import_poll(cls, context: Context):
+    if context.view_layer is None or context.view_layer.objects.active is None:
+        return False
+    active_object = context.view_layer.objects.active
+    if active_object is None or active_object.type != 'ARMATURE':
+        cls.poll_message_set('The active object must be an armature')
+        return False
+    return True
+
+
+class PSA_OT_import_sequences_select_from_text(Operator):
+    bl_idname = 'psa.import_sequences_select_from_text'
     bl_label = 'Select By Text List'
     bl_description = 'Select sequences by name from text list'
     bl_options = {'INTERNAL', 'UNDO'}
@@ -23,10 +34,12 @@ class PSA_OT_import_sequences_from_text(Operator):
         return len(pg.sequence_list) > 0
 
     def invoke(self, context, event):
+        assert context.window_manager
         return context.window_manager.invoke_props_dialog(self, width=256)
 
     def draw(self, context):
         layout = self.layout
+        assert layout
         pg = getattr(context.scene, 'psa_import')
         layout.label(icon='INFO', text='Each sequence name should be on a new line.')
         layout.prop(pg, 'select_text', text='')
@@ -48,7 +61,7 @@ class PSA_OT_import_sequences_from_text(Operator):
 
 
 class PSA_OT_import_sequences_select_all(Operator):
-    bl_idname = 'psa_import.sequences_select_all'
+    bl_idname = 'psa.import_sequences_select_all'
     bl_label = 'All'
     bl_description = 'Select all sequences'
     bl_options = {'INTERNAL'}
@@ -69,7 +82,7 @@ class PSA_OT_import_sequences_select_all(Operator):
 
 
 class PSA_OT_import_sequences_deselect_all(Operator):
-    bl_idname = 'psa_import.sequences_deselect_all'
+    bl_idname = 'psa.import_sequences_deselect_all'
     bl_label = 'None'
     bl_description = 'Deselect all visible sequences'
     bl_options = {'INTERNAL'}
@@ -97,7 +110,7 @@ def load_psa_file(context, filepath: str):
     try:
         # Read the file and populate the action list.
         p = os.path.abspath(filepath)
-        psa_reader = PsaReader(p)
+        psa_reader = PsaReader.from_path(p)
         for sequence in psa_reader.sequences.values():
             item = pg.sequence_list.add()
             item.action_name = sequence.name.decode('windows-1252')
@@ -112,8 +125,166 @@ def on_psa_file_path_updated(cls, context):
     load_psa_file(context, cls.filepath)
 
 
-class PSA_OT_import(Operator, ImportHelper):
-    bl_idname = 'psa_import.import'
+class PSA_OT_import_drag_and_drop(Operator, PsaImportMixin):
+    bl_idname = 'psa.import_drag_and_drop'
+    bl_label = 'Import PSA'
+    bl_description = 'Import multiple PSA files'
+    bl_options = {'INTERNAL', 'UNDO', 'PRESET'}
+
+    directory: StringProperty(subtype='FILE_PATH', options={'SKIP_SAVE', 'HIDDEN'})
+    files: CollectionProperty(type=OperatorFileListElement, options={'SKIP_SAVE', 'HIDDEN'})
+
+    def execute(self, context):
+        warnings = []
+        sequences_count = 0
+
+        assert context.view_layer and context.view_layer.objects.active
+
+        for file in self.files:
+            psa_path = str(os.path.join(self.directory, file.name))
+            psa_reader = PsaReader.from_path(psa_path)
+            sequence_names = list(psa_reader.sequences.keys())
+            options = psa_import_options_from_property_group(self, sequence_names)
+
+            sequences_count += len(sequence_names)
+
+            result = _import_psa(context, options, psa_path, context.view_layer.objects.active)
+            warnings.extend(result.warnings)
+
+        if len(warnings) > 0:
+            message = f'Imported {sequences_count} action(s) from {len(self.files)} file(s) with {len(warnings)} warning(s)\n'
+            self.report({'INFO'}, message)
+            for warning in warnings:
+                self.report({'WARNING'}, warning)
+
+        self.report({'INFO'}, f'Imported {sequences_count} action(s) from {len(self.files)} file(s)')
+
+        return {'FINISHED'}
+
+    def invoke(self, context: Context, event):
+        # Make sure the selected object is an obj.
+        assert context.view_layer and context.view_layer.objects.active
+        active_object = context.view_layer.objects.active
+        if active_object is None or active_object.type != 'ARMATURE':
+            self.report({'ERROR_INVALID_CONTEXT'}, 'The active object must be an armature')
+            return {'CANCELLED'}
+
+        # Show the import operator properties in a pop-up dialog (do not use the file selector).
+        assert context.window_manager
+        context.window_manager.invoke_props_dialog(self)
+        return {'RUNNING_MODAL'}
+
+    def draw(self, context):
+        layout = self.layout
+        draw_psa_import_options_no_panels(layout, self)
+
+
+def psa_import_options_from_property_group(pg: PsaImportMixin, sequence_names: Iterable[str]) -> PsaImportOptions:
+    options = PsaImportOptions()
+    options.sequence_names = list(sequence_names)
+    options.should_use_fake_user = pg.should_use_fake_user
+    options.should_stash = pg.should_stash
+    options.action_name_prefix = pg.action_name_prefix if pg.should_use_action_name_prefix else ''
+    options.should_overwrite = pg.should_overwrite
+    options.should_write_metadata = pg.should_write_metadata
+    options.should_write_keyframes = pg.should_write_keyframes
+    options.should_write_scale_keys = pg.should_write_scale_keys
+    options.should_convert_to_samples = pg.should_convert_to_samples
+    options.bone_mapping = BoneMapping(
+        is_case_sensitive=pg.bone_mapping_is_case_sensitive,
+        should_ignore_trailing_whitespace=pg.bone_mapping_should_ignore_trailing_whitespace
+    )
+    options.fps_source = pg.fps_source
+    options.fps_custom = pg.fps_custom
+    options.translation_scale = pg.translation_scale
+    return options
+
+
+def _import_psa(context,
+                options: PsaImportOptions,
+                filepath: str,
+                armature_object: Object
+                ):
+    warnings = []
+
+    if options.should_use_config_file:
+        # Read the PSA config file if it exists.
+        config_path = Path(filepath).with_suffix('.config')
+        if config_path.exists():
+            try:
+                options.psa_config = read_psa_config(options.sequence_names, str(config_path))
+            except Exception as e:
+                warnings.append(f'Failed to read PSA config file: {e}')
+
+    psa_reader = PsaReader.from_path(filepath)
+
+    result = import_psa(context, psa_reader, armature_object, options)
+    result.warnings.extend(warnings)
+
+    return result
+
+
+class PSA_OT_import_all(Operator, PsaImportMixin):
+    bl_idname = 'psa.import_all'
+    bl_label = 'Import PSA'
+    bl_description = 'Import all sequences from the selected PSA file'
+    bl_options = {'INTERNAL', 'UNDO'}
+
+    filepath: StringProperty(
+        name='File Path',
+        description='File path used for importing the PSA file',
+        maxlen=1024,
+        default='',
+        update=on_psa_file_path_updated)
+
+    @classmethod
+    def poll(cls, context):
+        return psa_import_poll(cls, context)
+
+    def execute(self, context):
+        sequence_names = []
+        with PsaReader.from_path(self.filepath) as psa_reader:
+            sequence_names.extend(psa_reader.sequences.keys())
+
+        options = PsaImportOptions(
+            action_name_prefix=self.action_name_prefix,
+            bone_mapping=BoneMapping(
+                is_case_sensitive=self.bone_mapping_is_case_sensitive,
+                should_ignore_trailing_whitespace=self.bone_mapping_should_ignore_trailing_whitespace
+            ),
+            fps_custom=self.fps_custom,
+            fps_source=self.fps_source,
+            sequence_names=sequence_names,
+            should_convert_to_samples=self.should_convert_to_samples,
+            should_overwrite=self.should_overwrite,
+            should_stash=self.should_stash,
+            should_use_config_file=self.should_use_config_file,
+            should_use_fake_user=self.should_use_fake_user,
+            should_write_keyframes=self.should_write_keyframes,
+            should_write_metadata=self.should_write_metadata,
+            translation_scale=self.translation_scale
+        )
+
+        assert context.view_layer
+        assert context.view_layer.objects.active
+        result = _import_psa(context, options, self.filepath, context.view_layer.objects.active)
+
+        if len(result.warnings) > 0:
+            message = f'Imported {len(options.sequence_names)} action(s) with {len(result.warnings)} warning(s)\n'
+            self.report({'WARNING'}, message)
+            for warning in result.warnings:
+                self.report({'WARNING'}, warning)
+        else:
+            self.report({'INFO'}, f'Imported {len(options.sequence_names)} action(s)')
+
+        return {'FINISHED'}
+
+    def draw(self, context: Context):
+        draw_psa_import_options_no_panels(self.layout, self)
+
+
+class PSA_OT_import(Operator, ImportHelper, PsaImportMixin):
+    bl_idname = 'psa.import_file'
     bl_label = 'Import'
     bl_description = 'Import the selected animations into the scene as actions'
     bl_options = {'INTERNAL', 'UNDO'}
@@ -129,64 +300,38 @@ class PSA_OT_import(Operator, ImportHelper):
 
     @classmethod
     def poll(cls, context):
-        active_object = context.view_layer.objects.active
-        if active_object is None or active_object.type != 'ARMATURE':
-            cls.poll_message_set('The active object must be an armature')
-            return False
-        return True
+        return psa_import_poll(cls, context)
 
     def execute(self, context):
         pg = getattr(context.scene, 'psa_import')
-        psa_reader = PsaReader(self.filepath)
-        sequence_names = [x.action_name for x in pg.sequence_list if x.is_selected]
+        options = psa_import_options_from_property_group(self, [x.action_name for x in pg.sequence_list if x.is_selected])
 
-        if len(sequence_names) == 0:
+        if len(options.sequence_names) == 0:
             self.report({'ERROR_INVALID_CONTEXT'}, 'No sequences selected')
             return {'CANCELLED'}
 
-        options = PsaImportOptions()
-        options.sequence_names = sequence_names
-        options.should_use_fake_user = pg.should_use_fake_user
-        options.should_stash = pg.should_stash
-        options.action_name_prefix = pg.action_name_prefix if pg.should_use_action_name_prefix else ''
-        options.should_overwrite = pg.should_overwrite
-        options.should_write_metadata = pg.should_write_metadata
-        options.should_write_keyframes = pg.should_write_keyframes
-        options.should_convert_to_samples = pg.should_convert_to_samples
-        options.bone_mapping_mode = pg.bone_mapping_mode
-        options.fps_source = pg.fps_source
-        options.fps_custom = pg.fps_custom
-
-        if options.should_use_config_file:
-            # Read the PSA config file if it exists.
-            config_path = Path(self.filepath).with_suffix('.config')
-            if config_path.exists():
-                try:
-                    options.psa_config = read_psa_config(psa_reader, str(config_path))
-                except Exception as e:
-                    self.report({'WARNING'}, f'Failed to read PSA config file: {e}')
-
-        result = import_psa(context, psa_reader, context.view_layer.objects.active, options)
+        result = _import_psa(context, options, self.filepath, context.view_layer.objects.active)
 
         if len(result.warnings) > 0:
-            message = f'Imported {len(sequence_names)} action(s) with {len(result.warnings)} warning(s)\n'
+            message = f'Imported {len(options.sequence_names)} action(s) with {len(result.warnings)} warning(s)\n'
             self.report({'WARNING'}, message)
             for warning in result.warnings:
                 self.report({'WARNING'}, warning)
         else:
-            self.report({'INFO'}, f'Imported {len(sequence_names)} action(s)')
+            self.report({'INFO'}, f'Imported {len(options.sequence_names)} action(s)')
 
         return {'FINISHED'}
 
     def invoke(self, context: Context, event: Event):
         # Attempt to load the PSA file for the pre-selected file.
         load_psa_file(context, self.filepath)
-
+        assert context.window_manager
         context.window_manager.fileselect_add(self)
         return {'RUNNING_MODAL'}
 
     def draw(self, context: Context):
         layout = self.layout
+        assert layout
         pg = getattr(context.scene, 'psa_import')
 
         sequences_header, sequences_panel = layout.panel('sequences_panel_id', default_closed=False)
@@ -205,7 +350,7 @@ class PSA_OT_import(Operator, ImportHelper):
 
                 row2 = col.row(align=True)
                 row2.label(text='Select')
-                row2.operator(PSA_OT_import_sequences_from_text.bl_idname, text='', icon='TEXT')
+                row2.operator(PSA_OT_import_sequences_select_from_text.bl_idname, text='', icon='TEXT')
                 row2.operator(PSA_OT_import_sequences_select_all.bl_idname, text='All', icon='CHECKBOX_HLT')
                 row2.operator(PSA_OT_import_sequences_deselect_all.bl_idname, text='None', icon='CHECKBOX_DEHLT')
 
@@ -215,13 +360,13 @@ class PSA_OT_import(Operator, ImportHelper):
             col = sequences_panel.column(heading='')
             col.use_property_split = True
             col.use_property_decorate = False
-            col.prop(pg, 'fps_source')
-            if pg.fps_source == 'CUSTOM':
-                col.prop(pg, 'fps_custom')
-            col.prop(pg, 'should_overwrite')
-            col.prop(pg, 'should_use_action_name_prefix')
-            if pg.should_use_action_name_prefix:
-                col.prop(pg, 'action_name_prefix')
+            col.prop(self, 'fps_source')
+            if self.fps_source == 'CUSTOM':
+                col.prop(self, 'fps_custom')
+            col.prop(self, 'should_overwrite')
+            col.prop(self, 'should_use_action_name_prefix')
+            if self.should_use_action_name_prefix:
+                col.prop(self, 'action_name_prefix')
 
         data_header, data_panel = layout.panel('data_panel_id', default_closed=False)
         data_header.label(text='Data')
@@ -230,48 +375,94 @@ class PSA_OT_import(Operator, ImportHelper):
             col = data_panel.column(heading='Write')
             col.use_property_split = True
             col.use_property_decorate = False
-            col.prop(pg, 'should_write_keyframes')
-            col.prop(pg, 'should_write_metadata')
+            col.prop(self, 'should_write_keyframes')
+            col.prop(self, 'should_write_metadata')
+            col.prop(self, 'should_write_scale_keys')
 
-            if pg.should_write_keyframes:
+            if self.should_write_keyframes:
                 col = col.column(heading='Keyframes')
                 col.use_property_split = True
                 col.use_property_decorate = False
-                col.prop(pg, 'should_convert_to_samples')
+                col.prop(self, 'should_convert_to_samples')
 
         advanced_header, advanced_panel = layout.panel('advanced_panel_id', default_closed=True)
         advanced_header.label(text='Advanced')
 
         if advanced_panel:
+            bone_mapping_header, bone_mapping_panel = layout.panel('bone_mapping_id', default_closed=False)
+            bone_mapping_header.label(text='Bone Mapping')
+            if bone_mapping_panel:
+                col = bone_mapping_panel.column()
+                col.use_property_split = True
+                col.use_property_decorate = False
+                col.prop(self, 'bone_mapping_is_case_sensitive')
+                col.prop(self, 'bone_mapping_should_ignore_trailing_whitespace')
+
             col = advanced_panel.column()
             col.use_property_split = True
             col.use_property_decorate = False
-            col.prop(pg, 'bone_mapping_mode')
+            col.prop(self, 'translation_scale', text='Translation Scale')
 
             col = advanced_panel.column(heading='Options')
             col.use_property_split = True
             col.use_property_decorate = False
-            col.prop(pg, 'should_use_fake_user')
-            col.prop(pg, 'should_stash')
-            col.prop(pg, 'should_use_config_file')
+            col.prop(self, 'should_use_fake_user')
+            col.prop(self, 'should_stash')
+            col.prop(self, 'should_use_config_file')
 
 
-class PSA_FH_import(FileHandler):
-    bl_idname = 'PSA_FH_import'
-    bl_label = 'File handler for Unreal PSA import'
-    bl_import_operator = 'psa_import.import'
-    bl_export_operator = 'psa_export.export'
-    bl_file_extensions = '.psa'
+def draw_psa_import_options_no_panels(layout, pg: PsaImportMixin):
+    col = layout.column(heading='Sequences')
+    col.use_property_split = True
+    col.use_property_decorate = False
+    col.prop(pg, 'fps_source')
+    if pg.fps_source == 'CUSTOM':
+        col.prop(pg, 'fps_custom')
+    col.prop(pg, 'should_overwrite')
+    col.prop(pg, 'should_use_action_name_prefix')
+    if pg.should_use_action_name_prefix:
+        col.prop(pg, 'action_name_prefix')
 
-    @classmethod
-    def poll_drop(cls, context: Context):
-        return context.area and context.area.type == 'VIEW_3D'
+    col = layout.column(heading='Write')
+    col.use_property_split = True
+    col.use_property_decorate = False
+    col.prop(pg, 'should_write_keyframes')
+    col.prop(pg, 'should_write_metadata')
+    col.prop(pg, 'should_write_scale_keys')
+
+    if pg.should_write_keyframes:
+        col = col.column(heading='Keyframes')
+        col.use_property_split = True
+        col.use_property_decorate = False
+        col.prop(pg, 'should_convert_to_samples')
+
+    col = layout.column(heading='Bone Mapping')
+    col.use_property_split = True
+    col.use_property_decorate = False
+    col.prop(pg, 'bone_mapping_is_case_sensitive')
+    col.prop(pg, 'bone_mapping_should_ignore_trailing_whitespace')
+
+    col = layout.column()
+    col.use_property_split = True
+    col.use_property_decorate = False
+    col.prop(pg, 'translation_scale')
+
+    col = layout.column(heading='Options')
+    col.use_property_split = True
+    col.use_property_decorate = False
+    col.prop(pg, 'should_use_fake_user')
+    col.prop(pg, 'should_stash')
+    col.prop(pg, 'should_use_config_file')
 
 
-classes = (
+_classes = (
     PSA_OT_import_sequences_select_all,
     PSA_OT_import_sequences_deselect_all,
-    PSA_OT_import_sequences_from_text,
+    PSA_OT_import_sequences_select_from_text,
     PSA_OT_import,
-    PSA_FH_import,
+    PSA_OT_import_all,
+    PSA_OT_import_drag_and_drop,
 )
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)

io_scene_psk_psa/psa/import_/properties.py

@@ -1,21 +1,25 @@
 import re
 from fnmatch import fnmatch
-from typing import List
 
-from bpy.props import StringProperty, BoolProperty, CollectionProperty, IntProperty, PointerProperty, EnumProperty, \
-    FloatProperty
+from bpy.props import (
+    BoolProperty,
+    CollectionProperty,
+    EnumProperty,
+    FloatProperty,
+    IntProperty,
+    PointerProperty,
+    StringProperty,
+)
 from bpy.types import PropertyGroup, Text
 
-empty_set = set()
-
 
 class PSA_PG_import_action_list_item(PropertyGroup):
-    action_name: StringProperty(options=empty_set)
-    is_selected: BoolProperty(default=True, options=empty_set)
+    action_name: StringProperty(options=set())
+    is_selected: BoolProperty(default=True, options=set())
 
 
 class PSA_PG_bone(PropertyGroup):
-    bone_name: StringProperty(options=empty_set)
+    bone_name: StringProperty(options=set())
 
 
 class PSA_PG_data(PropertyGroup):
@@ -23,89 +27,113 @@ class PSA_PG_data(PropertyGroup):
     sequence_count: IntProperty(default=0)
 
 
-class PSA_PG_import(PropertyGroup):
-    psa_error: StringProperty(default='')
-    psa: PointerProperty(type=PSA_PG_data)
-    sequence_list: CollectionProperty(type=PSA_PG_import_action_list_item)
-    sequence_list_index: IntProperty(name='', default=0)
+bone_mapping_items = (
+    ('EXACT', 'Exact', 'Bone names must match exactly.', 'EXACT', 0),
+    ('CASE_INSENSITIVE', 'Case Insensitive', 'Bones names must match, ignoring case (e.g., the bone PSA bone \'root\' can be mapped to the armature bone \'Root\')', 'CASE_INSENSITIVE', 1),
+)
+
+fps_source_items = (
+    ('SEQUENCE', 'Sequence', 'The sequence frame rate matches the original frame rate', 'ACTION', 0),
+    ('SCENE', 'Scene', 'The sequence is resampled to the frame rate of the scene', 'SCENE_DATA', 1),
+    ('CUSTOM', 'Custom', 'The sequence is resampled to a custom frame rate', 2),
+)
+
+compression_ratio_source_items = (
+    ('ACTION', 'Action', 'The compression ratio is sourced from the action metadata', 'ACTION', 0),
+    ('CUSTOM', 'Custom', 'The compression ratio is set to a custom value', 1),
+)
+
+class PsaImportMixin:
     should_use_fake_user: BoolProperty(default=True, name='Fake User',
                                        description='Assign each imported action a fake user so that the data block is '
                                                    'saved even it has no users',
-                                       options=empty_set)
+                                       options=set())
     should_use_config_file: BoolProperty(default=True, name='Use Config File',
-                                            description='Use the .config file that is sometimes generated when the PSA '
-                                                        'file is exported from UEViewer. This file contains '
-                                                        'options that can be used to filter out certain bones tracks '
-                                                        'from the imported actions',
-                                            options=empty_set)
+                                         description='Use the .config file that is sometimes generated when the PSA '
+                                                     'file is exported from UEViewer. This file contains '
+                                                     'options that can be used to filter out certain bones tracks '
+                                                     'from the imported actions',
+                                         options=set())
     should_stash: BoolProperty(default=False, name='Stash',
                                description='Stash each imported action as a strip on a new non-contributing NLA track',
-                               options=empty_set)
-    should_use_action_name_prefix: BoolProperty(default=False, name='Prefix Action Name', options=empty_set)
-    action_name_prefix: StringProperty(default='', name='Prefix', options=empty_set)
-    should_overwrite: BoolProperty(default=False, name='Overwrite', options=empty_set,
+                               options=set())
+    should_use_action_name_prefix: BoolProperty(default=False, name='Prefix Action Name', options=set())
+    action_name_prefix: StringProperty(default='', name='Prefix', options=set())
+    should_overwrite: BoolProperty(default=False, name='Overwrite', options=set(),
                                    description='If an action with a matching name already exists, the existing action '
                                                'will have it\'s data overwritten instead of a new action being created')
-    should_write_keyframes: BoolProperty(default=True, name='Keyframes', options=empty_set)
-    should_write_metadata: BoolProperty(default=True, name='Metadata', options=empty_set,
+    should_write_keyframes: BoolProperty(default=True, name='Keyframes', options=set())
+    should_write_metadata: BoolProperty(default=True, name='Metadata', options=set(),
                                         description='Additional data will be written to the custom properties of the '
                                                     'Action (e.g., frame rate)')
+    should_write_scale_keys: BoolProperty(default=True, name='Scale Keys', options=set())
     sequence_filter_name: StringProperty(default='', options={'TEXTEDIT_UPDATE'})
-    sequence_filter_is_selected: BoolProperty(default=False, options=empty_set, name='Only Show Selected',
+    sequence_filter_is_selected: BoolProperty(default=False, options=set(), name='Only Show Selected',
                                               description='Only show selected sequences')
-    sequence_use_filter_invert: BoolProperty(default=False, options=empty_set)
+    sequence_use_filter_invert: BoolProperty(default=False, options=set())
     sequence_use_filter_regex: BoolProperty(default=False, name='Regular Expression',
-                                            description='Filter using regular expressions', options=empty_set)
-    select_text: PointerProperty(type=Text)
+                                            description='Filter using regular expressions', options=set())
+
     should_convert_to_samples: BoolProperty(
         default=False,
         name='Convert to Samples',
         description='Convert keyframes to read-only samples. '
                     'Recommended if you do not plan on editing the actions directly'
     )
-    bone_mapping_mode: EnumProperty(
-        name='Bone Mapping',
-        options=empty_set,
-        description='The method by which bones from the incoming PSA file are mapped to the armature',
-        items=(
-            ('EXACT', 'Exact', 'Bone names must match exactly.', 'EXACT', 0),
-            ('CASE_INSENSITIVE', 'Case Insensitive', 'Bones names must match, ignoring case (e.g., the bone PSA bone '
-             '\'root\' can be mapped to the armature bone \'Root\')', 'CASE_INSENSITIVE', 1),
-        ),
-        default='CASE_INSENSITIVE'
+    bone_mapping_is_case_sensitive: BoolProperty(
+        default=False,
+        name='Case Sensitive'
+        )
+    bone_mapping_should_ignore_trailing_whitespace: BoolProperty(
+        default=True,
+        name='Ignore Trailing Whitespace'
     )
-    fps_source: EnumProperty(name='FPS Source', items=(
-        ('SEQUENCE', 'Sequence', 'The sequence frame rate matches the original frame rate', 'ACTION', 0),
-        ('SCENE', 'Scene', 'The sequence is resampled to the frame rate of the scene', 'SCENE_DATA', 1),
-        ('CUSTOM', 'Custom', 'The sequence is resampled to a custom frame rate', 2),
-    ))
+    fps_source: EnumProperty(name='FPS Source', items=fps_source_items)
     fps_custom: FloatProperty(
         default=30.0,
         name='Custom FPS',
         description='The frame rate to which the imported sequences will be resampled to',
-        options=empty_set,
+        options=set(),
         min=1.0,
         soft_min=1.0,
         soft_max=60.0,
         step=100,
     )
-    compression_ratio_source: EnumProperty(name='Compression Ratio Source', items=(
-        ('ACTION', 'Action', 'The compression ratio is sourced from the action metadata', 'ACTION', 0),
-        ('CUSTOM', 'Custom', 'The compression ratio is set to a custom value', 1),
-    ))
+    compression_ratio_source: EnumProperty(name='Compression Ratio Source', items=compression_ratio_source_items, default='ACTION')
     compression_ratio_custom: FloatProperty(
         default=1.0,
         name='Custom Compression Ratio',
         description='The compression ratio to apply to the imported sequences',
-        options=empty_set,
+        options=set(),
         min=0.0,
         soft_min=0.0,
         soft_max=1.0,
         step=0.0625,
     )
+    translation_scale: FloatProperty(
+        name='Translation Scale',
+        default=1.0,
+        description='Scale factor for bone translation values. Use this when the scale of the armature does not match the PSA file'
+    )
 
 
-def filter_sequences(pg: PSA_PG_import, sequences) -> List[int]:
+# This property group lives "globally" in the scene, since Operators cannot have PointerProperty or CollectionProperty
+# properties.
+class PSA_PG_import(PropertyGroup):
+    psa_error: StringProperty(default='')
+    psa: PointerProperty(type=PSA_PG_data)
+    sequence_list: CollectionProperty(type=PSA_PG_import_action_list_item)
+    sequence_list_index: IntProperty(name='', default=0)
+    sequence_filter_name: StringProperty(default='', options={'TEXTEDIT_UPDATE'})
+    sequence_filter_is_selected: BoolProperty(default=False, options=set(), name='Only Show Selected',
+                                              description='Only show selected sequences')
+    sequence_use_filter_invert: BoolProperty(default=False, options=set())
+    sequence_use_filter_regex: BoolProperty(default=False, name='Regular Expression',
+                                            description='Filter using regular expressions', options=set())
+    select_text: PointerProperty(type=Text)
+
+
+def filter_sequences(pg: PSA_PG_import, sequences) -> list[int]:
     bitflag_filter_item = 1 << 30
     flt_flags = [bitflag_filter_item] * len(sequences)
 
@@ -139,7 +167,7 @@ def filter_sequences(pg: PSA_PG_import, sequences) -> List[int]:
     return flt_flags
 
 
-def get_visible_sequences(pg: PSA_PG_import, sequences) -> List[PSA_PG_import_action_list_item]:
+def get_visible_sequences(pg: PSA_PG_import, sequences) -> list[PSA_PG_import_action_list_item]:
     bitflag_filter_item = 1 << 30
     visible_sequences = []
     for i, flag in enumerate(filter_sequences(pg, sequences)):
@@ -148,9 +176,12 @@ def get_visible_sequences(pg: PSA_PG_import, sequences) -> List[PSA_PG_import_ac
     return visible_sequences
 
 
-classes = (
+_classes = (
     PSA_PG_import_action_list_item,
     PSA_PG_bone,
     PSA_PG_data,
     PSA_PG_import,
 )
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)

io_scene_psk_psa/psa/import_/properties.pyi

@@ -0,0 +1,60 @@
+from bpy.types import PropertyGroup, Text
+
+from ...shared.types import BpyCollectionProperty
+
+
+class PSA_PG_import_action_list_item:
+    action_name: str
+    is_selected: bool
+
+
+class PSA_PG_bone:
+    bone_name: str
+
+
+class PSA_PG_data(PropertyGroup):
+    bones: BpyCollectionProperty[PSA_PG_bone]
+    sequence_count: int
+
+class PsaImportMixin:
+    should_use_fake_user: bool
+    should_use_config_file: bool
+    should_stash: bool
+    should_use_action_name_prefix: bool
+    action_name_prefix: str
+    should_overwrite: bool
+    should_write_keyframes: bool
+    should_write_metadata: bool
+    should_write_scale_keys: bool
+    sequence_filter_name: str
+    sequence_filter_is_selected: bool
+    sequence_use_filter_invert: bool
+    sequence_use_filter_regex: bool
+    should_convert_to_samples: bool
+    bone_mapping_is_case_sensitive: bool
+    bone_mapping_should_ignore_trailing_whitespace: bool
+    fps_source: str
+    fps_custom: float
+    compression_ratio_source: str
+    compression_ratio_custom: float
+    translation_scale: float
+    
+class PSA_PG_import:
+    psa_error: str
+    psa: PSA_PG_data
+    sequence_list: BpyCollectionProperty[PSA_PG_import_action_list_item]
+    sequence_list_index: int
+    sequence_filter_name: str
+    sequence_filter_is_selected: bool
+    sequence_use_filter_invert: bool
+    sequence_use_filter_regex: bool
+    select_text: Text | None
+
+
+
+def filter_sequences(pg: PSA_PG_import, sequences) -> list[int]:
+    pass
+
+
+def get_visible_sequences(pg: PSA_PG_import, sequences) -> list[PSA_PG_import_action_list_item]:
+    pass

io_scene_psk_psa/psa/import_/ui.py

@@ -22,9 +22,9 @@ class PSA_UL_sequences_mixin(UIList):
         sub_row.prop(pg, 'sequence_use_filter_regex', text='', icon='SORTBYEXT')
         sub_row.prop(pg, 'sequence_filter_is_selected', text='', icon='CHECKBOX_HLT')
 
-    def filter_items(self, context, data, property_):
+    def filter_items(self, context, data, property):
         pg = getattr(context.scene, 'psa_import')
-        sequences = getattr(data, property_)
+        sequences = getattr(data, property)
         flt_flags = filter_sequences(pg, sequences)
         flt_neworder = bpy.types.UI_UL_list.sort_items_by_name(sequences, 'action_name')
         return flt_flags, flt_neworder
@@ -42,8 +42,11 @@ class PSA_UL_import_actions(PSA_UL_sequences_mixin):
     pass
 
 
-classes = (
+_classes = (
     PSA_UL_sequences,
     PSA_UL_import_sequences,
     PSA_UL_import_actions,
 )
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)

io_scene_psk_psa/psa/importer.py

@@ -1,49 +1,81 @@
-import typing
-from typing import List, Optional
+from typing import Sequence, Iterable, cast as typing_cast
 
 import bpy
 import numpy as np
-from bpy.types import FCurve, Object, Context
+import re
+from bpy.types import Armature, Context, FCurve, Object, Bone, PoseBone
 from mathutils import Vector, Quaternion
+from bpy_extras import anim_utils
+
+from ..shared.types import PSX_PG_action_export
 
 from .config import PsaConfig, REMOVE_TRACK_LOCATION, REMOVE_TRACK_ROTATION
-from .data import Psa
-from .reader import PsaReader
+from psk_psa_py.psa.reader import PsaReader
+from psk_psa_py.shared.data import PsxBone
+
+class BoneMapping:
+    def __init__(self,
+                 is_case_sensitive: bool = False,
+                 should_ignore_trailing_whitespace: bool = True
+                 ):
+        self.is_case_sensitive = is_case_sensitive
+        # Ancient PSK and PSA exporters would, for some reason, pad the bone names with spaces
+        # instead of just writing null bytes, probably because the programmers were lazy.
+        # By default, we will ignore trailing whitespace when doing comparisons.
+        self.should_ignore_trailing_whitespace = should_ignore_trailing_whitespace
 
 
 class PsaImportOptions(object):
-    def __init__(self):
-        self.should_use_fake_user = False
-        self.should_stash = False
-        self.sequence_names = []
-        self.should_overwrite = False
-        self.should_write_keyframes = True
-        self.should_write_metadata = True
-        self.action_name_prefix = ''
-        self.should_convert_to_samples = False
-        self.bone_mapping_mode = 'CASE_INSENSITIVE'
-        self.fps_source = 'SEQUENCE'
-        self.fps_custom: float = 30.0
-        self.should_use_config_file = True
-        self.psa_config: PsaConfig = PsaConfig()
+    def __init__(self,
+                 action_name_prefix: str = '',
+                 bone_mapping: BoneMapping = BoneMapping(),
+                 fps_custom: float = 30.0,
+                 fps_source: str = 'SEQUENCE',
+                 psa_config: PsaConfig = PsaConfig(),
+                 sequence_names: list[str] | None = None,
+                 should_convert_to_samples: bool = False,
+                 should_overwrite: bool = False,
+                 should_stash: bool = False,
+                 should_use_config_file: bool = True,
+                 should_use_fake_user: bool = False,
+                 should_write_keyframes: bool = True,
+                 should_write_metadata: bool = True,
+                 should_write_scale_keys: bool = True,
+                 translation_scale: float = 1.0
+                 ):
+        self.action_name_prefix = action_name_prefix
+        self.bone_mapping = bone_mapping
+        self.fps_custom = fps_custom
+        self.fps_source = fps_source
+        self.psa_config = psa_config
+        self.sequence_names = sequence_names if sequence_names is not None else []
+        self.should_convert_to_samples = should_convert_to_samples
+        self.should_overwrite = should_overwrite
+        self.should_stash = should_stash
+        self.should_use_config_file = should_use_config_file
+        self.should_use_fake_user = should_use_fake_user
+        self.should_write_keyframes = should_write_keyframes
+        self.should_write_metadata = should_write_metadata
+        self.should_write_scale_keys = should_write_scale_keys
+        self.translation_scale = translation_scale
 
 
 class ImportBone(object):
-    def __init__(self, psa_bone: Psa.Bone):
-        self.psa_bone: Psa.Bone = psa_bone
-        self.parent: Optional[ImportBone] = None
-        self.armature_bone = None
-        self.pose_bone = None
+    def __init__(self, psa_bone: PsxBone):
+        self.psa_bone: PsxBone = psa_bone
+        self.parent: ImportBone | None = None
+        self.armature_bone: Bone | None = None
+        self.pose_bone: PoseBone | None = None
         self.original_location: Vector = Vector()
         self.original_rotation: Quaternion = Quaternion()
         self.post_rotation: Quaternion = Quaternion()
-        self.fcurves: List[FCurve] = []
+        self.fcurves: list[FCurve] = []
 
 
-def _calculate_fcurve_data(import_bone: ImportBone, key_data: typing.Iterable[float]):
+def _calculate_fcurve_data(import_bone: ImportBone, key_data: Sequence[float]):
     # Convert world-space transforms to local-space transforms.
     key_rotation = Quaternion(key_data[0:4])
-    key_location = Vector(key_data[4:])
+    key_location = Vector(key_data[4:7])
     q = import_bone.post_rotation.copy()
     q.rotate(import_bone.original_rotation)
     rotation = q
@@ -55,47 +87,62 @@ def _calculate_fcurve_data(import_bone: ImportBone, key_data: typing.Iterable[fl
     rotation.rotate(q.conjugated())
     location = key_location - import_bone.original_location
     location.rotate(import_bone.post_rotation.conjugated())
-    return rotation.w, rotation.x, rotation.y, rotation.z, location.x, location.y, location.z
+    scale = Vector(key_data[7:10])
+    return rotation.w, rotation.x, rotation.y, rotation.z, location.x, location.y, location.z, scale.x, scale.y, scale.z
 
 
 class PsaImportResult:
     def __init__(self):
-        self.warnings: List[str] = []
+        self.warnings: list[str] = []
 
 
-def _get_armature_bone_index_for_psa_bone(psa_bone_name: str, armature_bone_names: List[str], bone_mapping_mode: str = 'EXACT') -> Optional[int]:
+def _get_armature_bone_index_for_psa_bone(psa_bone_name: str, armature_bone_names: list[str], bone_mapping: BoneMapping) -> int | None:
     """
     @param psa_bone_name: The name of the PSA bone.
     @param armature_bone_names: The names of the bones in the armature.
-    @param bone_mapping_mode: One of 'EXACT' or 'CASE_INSENSITIVE'.
+    @param bone_mapping: Bone mapping information.
     @return: The index of the armature bone that corresponds to the given PSA bone, or None if no such bone exists.
     """
+    # Use regular expressions for bone name matching.
+    pattern = psa_bone_name
+    flags = 0
+
+    if bone_mapping.should_ignore_trailing_whitespace:
+        psa_bone_name = psa_bone_name.rstrip()
+        pattern += r'\s*'
+    
+    if not bone_mapping.is_case_sensitive:
+        flags = re.IGNORECASE
+    
+    pattern = re.compile(pattern, flags)
+
     for armature_bone_index, armature_bone_name in enumerate(armature_bone_names):
-        if bone_mapping_mode == 'CASE_INSENSITIVE':
-            if armature_bone_name.lower() == psa_bone_name.lower():
-                return armature_bone_index
-        else:
-            if armature_bone_name == psa_bone_name:
-                return armature_bone_index
+        if re.fullmatch(pattern, armature_bone_name):
+            return armature_bone_index
+
     return None
 
-def _get_sample_frame_times(source_frame_count: int, frame_step: float) -> typing.Iterable[float]:
-    # TODO: for correctness, we should also emit the target frame time as well (because the last frame can be a
-    #  fractional frame).
-    time = 0.0
-    while time < source_frame_count - 1:
-        yield time
-        time += frame_step
-    yield source_frame_count - 1
 
 def _resample_sequence_data_matrix(sequence_data_matrix: np.ndarray, frame_step: float = 1.0) -> np.ndarray:
     """
     Resamples the sequence data matrix to the target frame count.
+
     @param sequence_data_matrix: FxBx7 matrix where F is the number of frames, B is the number of bones, and X is the
     number of data elements per bone.
     @param frame_step: The step between frames in the resampled sequence.
     @return: The resampled sequence data matrix, or sequence_data_matrix if no resampling is necessary.
     """
+
+    def _get_sample_frame_times(source_frame_count: int, frame_step: float) -> Iterable[float]:
+        # TODO: for correctness, we should also emit the target frame time as well (because the last frame can be a
+        #  fractional frame).
+        assert frame_step > 0.0, 'Frame step must be greater than 0'
+        time = 0.0
+        while time < source_frame_count - 1:
+            yield time
+            time += frame_step
+        yield source_frame_count - 1
+
     if frame_step == 1.0:
         # No resampling is necessary.
         return sequence_data_matrix
@@ -125,10 +172,41 @@ def _resample_sequence_data_matrix(sequence_data_matrix: np.ndarray, frame_step:
     return resampled_sequence_data_matrix
 
 
+def _read_sequence_data_matrix(psa_reader: PsaReader, sequence_name: str) -> np.ndarray:
+    """
+    Reads and returns the data matrix for the given sequence.
+    The order of the data in the third axis is Qw, Qx, Qy, Qz, Lx, Ly, Lz, Sx, Sy, Sz
+    
+    @param sequence_name: The name of the sequence.
+    @return: An FxBx10 matrix where F is the number of frames, B is the number of bones.
+    """
+    sequence = psa_reader.sequences[sequence_name]
+    keys = psa_reader.read_sequence_keys(sequence_name)
+    bone_count = len(psa_reader.bones)
+    matrix_size = sequence.frame_count, bone_count, 10
+    matrix = np.ones(matrix_size)
+    keys_iter = iter(keys)
+    # Populate rotation and location data.
+    for frame_index in range(sequence.frame_count):
+        for bone_index in range(bone_count):
+            matrix[frame_index, bone_index, :7] = list(next(keys_iter).data)
+    # Populate scale data, if it exists.
+    scale_keys = psa_reader.read_sequence_scale_keys(sequence_name)
+    if len(scale_keys) > 0:
+        scale_keys_iter = iter(scale_keys)
+        for frame_index in range(sequence.frame_count):
+            for bone_index in range(bone_count):
+                matrix[frame_index, bone_index, 7:] = list(next(scale_keys_iter).data)
+    return matrix
+
+
 def import_psa(context: Context, psa_reader: PsaReader, armature_object: Object, options: PsaImportOptions) -> PsaImportResult:
+
+    assert context.window_manager
+
     result = PsaImportResult()
     sequences = [psa_reader.sequences[x] for x in options.sequence_names]
-    armature_data = typing.cast(bpy.types.Armature, armature_object.data)
+    armature_data = typing_cast(Armature, armature_object.data)
 
     # Create an index mapping from bones in the PSA to bones in the target armature.
     psa_to_armature_bone_indices = {}
@@ -139,7 +217,7 @@ def import_psa(context: Context, psa_reader: PsaReader, armature_object: Object,
 
     for psa_bone_index, psa_bone in enumerate(psa_reader.bones):
         psa_bone_name: str = psa_bone.name.decode('windows-1252')
-        armature_bone_index = _get_armature_bone_index_for_psa_bone(psa_bone_name, armature_bone_names, options.bone_mapping_mode)
+        armature_bone_index = _get_armature_bone_index_for_psa_bone(psa_bone_name, armature_bone_names, options.bone_mapping)
         if armature_bone_index is not None:
             # Ensure that no other PSA bone has been mapped to this armature bone yet.
             if armature_bone_index not in armature_to_psa_bone_indices:
@@ -170,6 +248,8 @@ def import_psa(context: Context, psa_reader: PsaReader, armature_object: Object,
         )
     del armature_bone_names
 
+    assert armature_object.pose
+
     # Create intermediate bone data for import operations.
     import_bones = []
     psa_bone_names_to_import_bones = dict()
@@ -233,21 +313,27 @@ def import_psa(context: Context, psa_reader: PsaReader, armature_object: Object,
             action = bpy.data.actions[action_name]
         else:
             action = bpy.data.actions.new(name=action_name)
+            action_slot = action.slots.new('OBJECT', armature_object.name)
+
+        # TODO: Wish there was a better way to do this.
+        action_slot = action.slots[f'OB{armature_object.name}']
+
+        assert action_slot
 
         # Calculate the target FPS.
         match options.fps_source:
             case 'CUSTOM':
                 target_fps = options.fps_custom
             case 'SCENE':
+                assert context.scene
                 target_fps = context.scene.render.fps
             case 'SEQUENCE':
                 target_fps = sequence.fps
             case _:
-                raise ValueError(f'Unknown FPS source: {options.fps_source}')
+                assert False, f'Invalid FPS source: {options.fps_source}'
 
         if options.should_write_keyframes:            
-            # Remove existing f-curves.
-            action.fcurves.clear()
+            channelbag = anim_utils.action_ensure_channelbag_for_slot(action, action_slot)
 
             # Create f-curves for the rotation and location of each bone.
             for psa_bone_index, armature_bone_index in psa_to_armature_bone_indices.items():
@@ -256,20 +342,29 @@ def import_psa(context: Context, psa_reader: PsaReader, armature_object: Object,
                 pose_bone = import_bone.pose_bone
                 rotation_data_path = pose_bone.path_from_id('rotation_quaternion')
                 location_data_path = pose_bone.path_from_id('location')
+                scale_data_path = pose_bone.path_from_id('scale')
                 add_rotation_fcurves = (bone_track_flags & REMOVE_TRACK_ROTATION) == 0
                 add_location_fcurves = (bone_track_flags & REMOVE_TRACK_LOCATION) == 0
+                add_scale_fcurves = psa_reader.has_scale_keys and options.should_write_scale_keys
                 import_bone.fcurves = [
-                    action.fcurves.new(rotation_data_path, index=0, action_group=pose_bone.name) if add_rotation_fcurves else None,  # Qw
-                    action.fcurves.new(rotation_data_path, index=1, action_group=pose_bone.name) if add_rotation_fcurves else None,  # Qx
-                    action.fcurves.new(rotation_data_path, index=2, action_group=pose_bone.name) if add_rotation_fcurves else None,  # Qy
-                    action.fcurves.new(rotation_data_path, index=3, action_group=pose_bone.name) if add_rotation_fcurves else None,  # Qz
-                    action.fcurves.new(location_data_path, index=0, action_group=pose_bone.name) if add_location_fcurves else None,  # Lx
-                    action.fcurves.new(location_data_path, index=1, action_group=pose_bone.name) if add_location_fcurves else None,  # Ly
-                    action.fcurves.new(location_data_path, index=2, action_group=pose_bone.name) if add_location_fcurves else None,  # Lz
+                    channelbag.fcurves.ensure(rotation_data_path, index=0, group_name=pose_bone.name) if add_rotation_fcurves else None,  # Qw
+                    channelbag.fcurves.ensure(rotation_data_path, index=1, group_name=pose_bone.name) if add_rotation_fcurves else None,  # Qx
+                    channelbag.fcurves.ensure(rotation_data_path, index=2, group_name=pose_bone.name) if add_rotation_fcurves else None,  # Qy
+                    channelbag.fcurves.ensure(rotation_data_path, index=3, group_name=pose_bone.name) if add_rotation_fcurves else None,  # Qz
+                    channelbag.fcurves.ensure(location_data_path, index=0, group_name=pose_bone.name) if add_location_fcurves else None,  # Lx
+                    channelbag.fcurves.ensure(location_data_path, index=1, group_name=pose_bone.name) if add_location_fcurves else None,  # Ly
+                    channelbag.fcurves.ensure(location_data_path, index=2, group_name=pose_bone.name) if add_location_fcurves else None,  # Lz
+                    channelbag.fcurves.ensure(scale_data_path,    index=0, group_name=pose_bone.name) if add_scale_fcurves    else None,  # Sx
+                    channelbag.fcurves.ensure(scale_data_path,    index=1, group_name=pose_bone.name) if add_scale_fcurves    else None,  # Sy
+                    channelbag.fcurves.ensure(scale_data_path,    index=2, group_name=pose_bone.name) if add_scale_fcurves    else None,  # Sz
                 ]
 
             # Read the sequence data matrix from the PSA.
-            sequence_data_matrix = psa_reader.read_sequence_data_matrix(sequence_name)
+            sequence_data_matrix = _read_sequence_data_matrix(psa_reader, sequence_name)
+
+            if options.translation_scale != 1.0:
+                # Scale the translation data.
+                sequence_data_matrix[:, :, 4:7] *= options.translation_scale
 
             # Convert the sequence's data from world-space to local-space.
             for bone_index, import_bone in enumerate(import_bones):
@@ -298,6 +393,7 @@ def import_psa(context: Context, psa_reader: PsaReader, armature_object: Object,
                 for fcurve_index, fcurve in enumerate(import_bone.fcurves):
                     if fcurve is None:
                         continue
+                    fcurve.keyframe_points.clear()
                     fcurve_data[1::2] = resampled_sequence_data_matrix[:, bone_index, fcurve_index]
                     fcurve.keyframe_points.add(target_frame_count)
                     fcurve.keyframe_points.foreach_set('co', fcurve_data)
@@ -306,12 +402,13 @@ def import_psa(context: Context, psa_reader: PsaReader, armature_object: Object,
 
             if options.should_convert_to_samples:
                 # Bake the curve to samples.
-                for fcurve in action.fcurves:
+                for fcurve in channelbag.fcurves:
                     fcurve.convert_to_samples(start=0, end=sequence.frame_count)
 
         # Write meta-data.
         if options.should_write_metadata:
-            action.psa_export.fps = target_fps
+            pg = typing_cast(PSX_PG_action_export, getattr(action, 'psa_export'))
+            pg.fps = target_fps
 
         action.use_fake_user = options.should_use_fake_user
 
@@ -321,10 +418,11 @@ def import_psa(context: Context, psa_reader: PsaReader, armature_object: Object,
 
     # If the user specifies, store the new animations as strips on a non-contributing NLA track.
     if options.should_stash:
-        if armature_object.animation_data is None:
-            armature_object.animation_data_create()
+        animation_data = armature_object.animation_data
+        if animation_data is None:
+            animation_data = armature_object.animation_data_create()
         for action in actions:
-            nla_track = armature_object.animation_data.nla_tracks.new()
+            nla_track = animation_data.nla_tracks.new()
             nla_track.name = action.name
             nla_track.mute = True
             nla_track.strips.new(name=action.name, start=0, action=action)

io_scene_psk_psa/psa/reader.py

@@ -1,117 +0,0 @@
-import ctypes
-
-import numpy as np
-
-from .data import *
-
-
-def _try_fix_cue4parse_issue_103(sequences) -> bool:
-    # Detect if the file was exported from CUE4Parse prior to the fix for issue #103.
-    # https://github.com/FabianFG/CUE4Parse/issues/103
-    # The issue was that the frame_start_index was not being set correctly, and was always being set to the same value
-    # as the frame_count.
-    # This fix will eventually be deprecated as it is only necessary for files exported prior to the fix.
-    if len(sequences) > 0 and sequences[0].frame_start_index == sequences[0].frame_count:
-        # Manually set the frame_start_index for each sequence. This assumes that the sequences are in order with
-        # no shared frames between sequences (all exporters that I know of do this, so it's a safe assumption).
-        frame_start_index = 0
-        for i, sequence in enumerate(sequences):
-            sequence.frame_start_index = frame_start_index
-            frame_start_index += sequence.frame_count
-        return True
-    return False
-
-
-class PsaReader(object):
-    """
-    This class reads the sequences and bone information immediately upon instantiation and holds onto a file handle.
-    The keyframe data is not read into memory upon instantiation due to its potentially very large size.
-    To read the key data for a particular sequence, call :read_sequence_keys.
-    """
-
-    def __init__(self, path):
-        self.keys_data_offset: int = 0
-        self.fp = open(path, 'rb')
-        self.psa: Psa = self._read(self.fp)
-
-    @property
-    def bones(self):
-        return self.psa.bones
-
-    @property
-    def sequences(self):
-        return self.psa.sequences
-
-    def read_sequence_data_matrix(self, sequence_name: str) -> np.ndarray:
-        """
-        Reads and returns the data matrix for the given sequence.
-        @param sequence_name: The name of the sequence.
-        @return: An FxBx7 matrix where F is the number of frames, B is the number of bones.
-        """
-        sequence = self.psa.sequences[sequence_name]
-        keys = self.read_sequence_keys(sequence_name)
-        bone_count = len(self.bones)
-        matrix_size = sequence.frame_count, bone_count, 7
-        matrix = np.zeros(matrix_size)
-        keys_iter = iter(keys)
-        for frame_index in range(sequence.frame_count):
-            for bone_index in range(bone_count):
-                matrix[frame_index, bone_index, :] = list(next(keys_iter).data)
-        return matrix
-
-    def read_sequence_keys(self, sequence_name: str) -> List[Psa.Key]:
-        """
-        Reads and returns the key data for a sequence.
-
-        @param sequence_name: The name of the sequence.
-        @return: A list of Psa.Keys.
-        """
-        # Set the file reader to the beginning of the keys data
-        sequence = self.psa.sequences[sequence_name]
-        data_size = sizeof(Psa.Key)
-        bone_count = len(self.psa.bones)
-        buffer_length = data_size * bone_count * sequence.frame_count
-        sequence_keys_offset = self.keys_data_offset + (sequence.frame_start_index * bone_count * data_size)
-        self.fp.seek(sequence_keys_offset, 0)
-        buffer = self.fp.read(buffer_length)
-        offset = 0
-        keys = []
-        for _ in range(sequence.frame_count * bone_count):
-            key = Psa.Key.from_buffer_copy(buffer, offset)
-            keys.append(key)
-            offset += data_size
-        return keys
-
-    @staticmethod
-    def _read_types(fp, data_class, section: Section, data):
-        buffer_length = section.data_size * section.data_count
-        buffer = fp.read(buffer_length)
-        offset = 0
-        for _ in range(section.data_count):
-            data.append(data_class.from_buffer_copy(buffer, offset))
-            offset += section.data_size
-
-    def _read(self, fp) -> Psa:
-        psa = Psa()
-        while fp.read(1):
-            fp.seek(-1, 1)
-            section = Section.from_buffer_copy(fp.read(ctypes.sizeof(Section)))
-            if section.name == b'ANIMHEAD':
-                pass
-            elif section.name == b'BONENAMES':
-                PsaReader._read_types(fp, Psa.Bone, section, psa.bones)
-            elif section.name == b'ANIMINFO':
-                sequences = []
-                PsaReader._read_types(fp, Psa.Sequence, section, sequences)
-                # Try to fix CUE4Parse bug, if necessary.
-                _try_fix_cue4parse_issue_103(sequences)
-                for sequence in sequences:
-                    psa.sequences[sequence.name.decode()] = sequence
-            elif section.name == b'ANIMKEYS':
-                # Skip keys on this pass. We will keep this file open and read from it as needed.
-                self.keys_data_offset = fp.tell()
-                fp.seek(section.data_size * section.data_count, 1)
-            else:
-                fp.seek(section.data_size * section.data_count, 1)
-                print(f'Unrecognized section in PSA: "{section.name}"')
-        return psa

io_scene_psk_psa/psa/writer.py

@@ -1,25 +0,0 @@
-from ctypes import Structure, sizeof
-from typing import Type
-
-from .data import Psa
-from ..shared.data import Section
-
-
-def write_section(fp, name: bytes, data_type: Type[Structure] = None, data: list = None):
-    section = Section()
-    section.name = name
-    if data_type is not None and data is not None:
-        section.data_size = sizeof(data_type)
-        section.data_count = len(data)
-    fp.write(section)
-    if data is not None:
-        for datum in data:
-            fp.write(datum)
-
-
-def write_psa(psa: Psa, path: str):
-    with open(path, 'wb') as fp:
-        write_section(fp, b'ANIMHEAD')
-        write_section(fp, b'BONENAMES', Psa.Bone, psa.bones)
-        write_section(fp, b'ANIMINFO', Psa.Sequence, list(psa.sequences.values()))
-        write_section(fp, b'ANIMKEYS', Psa.Key, psa.keys)

io_scene_psk_psa/psk/builder.py

@@ -1,262 +1,307 @@
-from typing import Optional
-
 import bmesh
 import bpy
 import numpy as np
-from bpy.types import Armature, Material, Collection, Context
-
-from .data import *
+from bpy.types import Armature, Context, Object, Mesh
+from mathutils import Matrix, Quaternion
+from typing import Iterable, cast as typing_cast
+from psk_psa_py.shared.data import PsxBone, Vector3
+from psk_psa_py.psk.data import Psk
 from .properties import triangle_type_and_bit_flags_to_poly_flags
-from ..shared.helpers import *
-
-
-class PskInputObjects(object):
-    def __init__(self):
-        self.mesh_objects = []
-        self.armature_object: Optional[Object] = None
+from ..shared.helpers import (
+    ObjectNode,
+    ObjectTree,
+    PskInputObjects,
+    PsxBoneCollection,
+    convert_bpy_quaternion_to_psx_quaternion,
+    convert_string_to_cp1252_bytes,
+    create_psx_bones,
+    get_armature_for_mesh_object,
+    get_coordinate_system_transform,
+    get_materials_for_mesh_objects,
+)
 
 
 class PskBuildOptions(object):
     def __init__(self):
         self.bone_filter_mode = 'ALL'
-        self.bone_collection_indices: List[int] = []
+        self.bone_collection_indices: list[PsxBoneCollection] = []
         self.object_eval_state = 'EVALUATED'
-        self.materials: List[Material] = []
-        self.should_enforce_bone_name_restrictions = False
-
-
-def get_mesh_objects_for_collection(collection: Collection):
-    for obj in collection.all_objects:
-        if obj.type == 'MESH':
-            yield obj
-
-
-def get_mesh_objects_for_context(context: Context):
-    for obj in context.view_layer.objects.selected:
-        if obj.type == 'MESH':
-            yield obj
-
-
-def get_armature_for_mesh_objects(mesh_objects: List[Object]) -> Optional[Object]:
-    # Ensure that there are either no armature modifiers (static mesh) or that there is exactly one armature modifier
-    # object shared between all meshes.
-    armature_modifier_objects = set()
-    for mesh_object in mesh_objects:
-        modifiers = [x for x in mesh_object.modifiers if x.type == 'ARMATURE']
-        if len(modifiers) == 0:
-            continue
-        elif len(modifiers) > 1:
-            raise RuntimeError(f'Mesh "{mesh_object.name}" must have only one armature modifier')
-        armature_modifier_objects.add(modifiers[0].object)
-
-    if len(armature_modifier_objects) > 1:
-        armature_modifier_names = [x.name for x in armature_modifier_objects]
-        raise RuntimeError(
-            f'All meshes must have the same armature modifier, encountered {len(armature_modifier_names)} ({", ".join(armature_modifier_names)})')
-    elif len(armature_modifier_objects) == 1:
-        return list(armature_modifier_objects)[0]
-    else:
-        return None
-
-
-def _get_psk_input_objects(mesh_objects: List[Object]) -> PskInputObjects:
-    if len(mesh_objects) == 0:
-        raise RuntimeError('At least one mesh must be selected')
-
-    for mesh_object in mesh_objects:
-        if len(mesh_object.data.materials) == 0:
-            raise RuntimeError(f'Mesh "{mesh_object.name}" must have at least one material')
-
-    input_objects = PskInputObjects()
-    input_objects.mesh_objects = mesh_objects
-    input_objects.armature_object = get_armature_for_mesh_objects(mesh_objects)
-
-    return input_objects
-
-
-def get_psk_input_objects_for_context(context: Context) -> PskInputObjects:
-    mesh_objects = list(get_mesh_objects_for_context(context))
-    return _get_psk_input_objects(mesh_objects)
-
-
-def get_psk_input_objects_for_collection(collection: Collection) -> PskInputObjects:
-    mesh_objects = list(get_mesh_objects_for_collection(collection))
-    return _get_psk_input_objects(mesh_objects)
+        self.material_order_mode = 'AUTOMATIC'
+        self.material_name_list: list[str] = []
+        self.scale = 1.0
+        self.export_space = 'WORLD'
+        self.forward_axis = 'X'
+        self.up_axis = 'Z'
 
 
 class PskBuildResult(object):
-    def __init__(self):
-        self.psk = None
-        self.warnings: List[str] = []
+    def __init__(self, psk: Psk, warnings: list[str]):
+        self.psk: Psk = psk
+        self.warnings: list[str] = warnings
 
 
-def build_psk(context, input_objects: PskInputObjects, options: PskBuildOptions) -> PskBuildResult:
-    armature_object: bpy.types.Object = input_objects.armature_object
+def _get_mesh_export_space_matrix(node: ObjectNode | None, export_space: str) -> Matrix:
+    if node is None:
+        return Matrix.Identity(4)
     
-    result = PskBuildResult()
-    psk = Psk()
-    bones = []
+    armature_object = node.object
+    root_armature_object = node.root.object
 
-    if armature_object is None or len(armature_object.data.bones) == 0:
-        # If the mesh has no armature object or no bones, simply assign it a dummy bone at the root to satisfy the
-        # requirement that a PSK file must have at least one bone.
-        psk_bone = Psk.Bone()
-        psk_bone.name = bytes('root', encoding='windows-1252')
-        psk_bone.flags = 0
-        psk_bone.children_count = 0
-        psk_bone.parent_index = 0
-        psk_bone.location = Vector3.zero()
-        psk_bone.rotation = Quaternion.identity()
-        psk.bones.append(psk_bone)
-    else:
-        bone_names = get_export_bone_names(armature_object, options.bone_filter_mode, options.bone_collection_indices)
-        armature_data = typing.cast(Armature, armature_object.data)
-        bones = [armature_data.bones[bone_name] for bone_name in bone_names]
+    def get_object_space_matrix(obj: Object) -> Matrix:
+        translation, rotation, _ = obj.matrix_world.decompose()
+        # We neutralize the scale here because the scale is already applied to the mesh objects implicitly.
+        return Matrix.Translation(translation) @ rotation.to_matrix().to_4x4()
 
-        # Check that all bone names are valid.
-        if options.should_enforce_bone_name_restrictions:
-            check_bone_names(map(lambda x: x.name, bones))
+    armature_space_matrix = get_object_space_matrix(armature_object)
+    root_armature_space_matrix = get_object_space_matrix(root_armature_object)
+    relative_matrix = root_armature_space_matrix @ armature_space_matrix.inverted()
 
-        for bone in bones:
-            psk_bone = Psk.Bone()
-            try:
-                psk_bone.name = bytes(bone.name, encoding='windows-1252')
-            except UnicodeEncodeError:
-                raise RuntimeError(
-                    f'Bone name "{bone.name}" contains characters that cannot be encoded in the Windows-1252 codepage')
-            psk_bone.flags = 0
-            psk_bone.children_count = 0
+    match export_space:
+        case 'WORLD':
+            return Matrix.Identity(4)
+        case 'ARMATURE':
+            return (armature_space_matrix @ relative_matrix).inverted()
+        case 'ROOT':
+            root_armature_data = typing_cast(Armature, root_armature_object.data)
+            if len(root_armature_data.bones) == 0:
+                raise RuntimeError(f'Armature {root_armature_data.name} has no bones')
+            return (armature_space_matrix @ relative_matrix @ root_armature_data.bones[0].matrix_local).inverted()
+        case _:
+            assert False, f'Invalid export space: {export_space}'
 
-            try:
-                parent_index = bones.index(bone.parent)
-                psk_bone.parent_index = parent_index
-                psk.bones[parent_index].children_count += 1
-            except ValueError:
-                psk_bone.parent_index = 0
 
-            if bone.parent is not None:
-                rotation = bone.matrix.to_quaternion().conjugated()
-                inverse_parent_rotation = bone.parent.matrix.to_quaternion().inverted()
-                parent_head = inverse_parent_rotation @ bone.parent.head
-                parent_tail = inverse_parent_rotation @ bone.parent.tail
-                location = (parent_tail - parent_head) + bone.head
-            else:
-                armature_local_matrix = armature_object.matrix_local
-                location = armature_local_matrix @ bone.head
-                bone_rotation = bone.matrix.to_quaternion().conjugated()
-                local_rotation = armature_local_matrix.to_3x3().to_quaternion().conjugated()
-                rotation = bone_rotation @ local_rotation
-                rotation.conjugate()
-
-            psk_bone.location.x = location.x
-            psk_bone.location.y = location.y
-            psk_bone.location.z = location.z
-
-            psk_bone.rotation.w = rotation.w
-            psk_bone.rotation.x = rotation.x
-            psk_bone.rotation.y = rotation.y
-            psk_bone.rotation.z = rotation.z
-
-            psk.bones.append(psk_bone)
-
-    # MATERIALS
-    for material in options.materials:
-        psk_material = Psk.Material()
+def _get_material_name_indices(obj: Object, material_names: list[str]) -> Iterable[int]:
+    """
+    Returns the index of the material in the list of material names.
+    If the material is not found or the slot is empty, the index of 'None' is returned.
+    """
+    for material_slot in obj.material_slots:
         try:
-            psk_material.name = bytes(material.name, encoding='windows-1252')
-        except UnicodeEncodeError:
-            raise RuntimeError(f'Material name "{material.name}" contains characters that cannot be encoded in the Windows-1252 codepage')
+            material_name = material_slot.material.name if material_slot.material is not None else 'None'
+            yield material_names.index(material_name)
+        except ValueError:
+            yield 0
+
+
+def build_psk(context: Context, input_objects: PskInputObjects, options: PskBuildOptions) -> PskBuildResult:
+
+    assert context.window_manager
+
+    armature_objects = list(input_objects.armature_objects)
+    armature_object_tree = ObjectTree(input_objects.armature_objects)    
+
+    warnings: list[str] = []
+    psk = Psk()
+
+    psx_bone_create_result = create_psx_bones(
+        armature_objects=armature_objects,
+        export_space=options.export_space,
+        forward_axis=options.forward_axis,
+        up_axis=options.up_axis,
+        scale=options.scale,
+        bone_filter_mode=options.bone_filter_mode,
+        bone_collection_indices=options.bone_collection_indices
+    )
+
+    psk.bones = [bone.psx_bone for bone in psx_bone_create_result.bones]
+
+    if len(psk.bones) == 0:
+        # Add a default root bone if there are no bones to export.
+        # This is necessary because Unreal Engine requires at least one bone in the PSK file.
+        psx_bone = PsxBone()
+        psx_bone.name = b'ROOT'
+        psx_bone.rotation = convert_bpy_quaternion_to_psx_quaternion(Quaternion())
+        psk.bones.append(psx_bone)
+
+    # Materials
+    mesh_objects = [dfs_object.obj for dfs_object in input_objects.mesh_dfs_objects]
+    
+    match options.material_order_mode:
+        case 'AUTOMATIC':
+            materials = list(get_materials_for_mesh_objects(context.evaluated_depsgraph_get(), mesh_objects))
+        case 'MANUAL':
+            # The material name list may contain materials that are not on the mesh objects.
+            # Therefore, we can take the material_name_list as gospel and simply use it as a lookup table.
+            # If a look-up fails, replace it with an empty material.
+            materials = [bpy.data.materials.get(x, None) for x in options.material_name_list]
+            
+            # Check if any mesh needs a None material (has no slots or empty slots)
+            needs_none_material = False
+            for mesh_object in mesh_objects:
+                evaluated_mesh_object = mesh_object.evaluated_get(context.evaluated_depsgraph_get())
+                if len(evaluated_mesh_object.material_slots) == 0:
+                    needs_none_material = True
+                    break
+                for material_slot in evaluated_mesh_object.material_slots:
+                    if material_slot.material is None:
+                        needs_none_material = True
+                        break
+                if needs_none_material:
+                    break
+            
+            # Append None at the end if needed and not already present
+            if needs_none_material and None not in materials:
+                materials.append(None)
+        case _:
+            assert False, f'Invalid material order mode: {options.material_order_mode}'
+
+    for material in materials:
+        psk_material = Psk.Material()
+        psk_material.name = convert_string_to_cp1252_bytes(material.name if material else 'None')
         psk_material.texture_index = len(psk.materials)
-        psk_material.poly_flags = triangle_type_and_bit_flags_to_poly_flags(material.psk.mesh_triangle_type,
-                                                                            material.psk.mesh_triangle_bit_flags)
+        if material is not None:
+            psk_material.poly_flags = triangle_type_and_bit_flags_to_poly_flags(material.psk.mesh_triangle_type,
+                                                                                material.psk.mesh_triangle_bit_flags)
         psk.materials.append(psk_material)
 
-    context.window_manager.progress_begin(0, len(input_objects.mesh_objects))
+    # Ensure at least one material exists
+    if len(psk.materials) == 0:
+        # Add a default material if no materials are present.
+        psk_material = Psk.Material()
+        psk_material.name = convert_string_to_cp1252_bytes('None')
+        psk.materials.append(psk_material)
 
-    material_names = [m.name for m in options.materials]
+    context.window_manager.progress_begin(0, len(input_objects.mesh_dfs_objects))
+    coordinate_system_matrix = get_coordinate_system_transform(options.forward_axis, options.up_axis)
+    root_armature_object = next(iter(armature_object_tree), None)
 
-    for object_index, input_mesh_object in enumerate(input_objects.mesh_objects):
+    # Calculate the export spaces for the armature objects.
+    # This is used later to transform the mesh object geometry into the export space.
+    armature_mesh_export_space_matrices: dict[Object | None, Matrix] = {None: Matrix.Identity(4)}
 
+    if options.export_space == 'ARMATURE':
+        # For meshes without an armature modifier, we need to set the export space to the first armature object.
+        armature_mesh_export_space_matrices[None] = _get_mesh_export_space_matrix(root_armature_object, options.export_space)
+    
+    # TODO: also handle the case of multiple roots; dont' just assume we have one!
+    for armature_node in iter(armature_object_tree):
+        armature_mesh_export_space_matrices[armature_node.object] = _get_mesh_export_space_matrix(armature_node, options.export_space)
+    
+    # Temporarily force the armature into the rest position.
+    # The original pose position setting will be restored at the end.
+    original_armature_object_pose_positions = {a: a.data.pose_position for a in armature_objects}
+    for armature_object in armature_objects:
+        armature_data = typing_cast(Armature, armature_object.data)
+        armature_data.pose_position = 'REST'
+
+    material_names = [m.name if m is not None else 'None' for m in materials]
+
+    scale_matrix = Matrix.Scale(options.scale, 4)
+
+    for object_index, input_mesh_object in enumerate(input_objects.mesh_dfs_objects):
+        obj, matrix_world = input_mesh_object.obj, input_mesh_object.matrix_world
+        armature_object = get_armature_for_mesh_object(obj)
         should_flip_normals = False
 
-        # MATERIALS
-        material_indices = [material_names.index(material_slot.material.name) for material_slot in input_mesh_object.material_slots]
+        # Material indices
+        material_indices = list(_get_material_name_indices(obj, material_names))
 
-        # MESH DATA
+        if len(material_indices) == 0:
+            # If the mesh has no material slots, map to the 'None' material index
+            try:
+                none_material_index = material_names.index('None')
+            except ValueError:
+                none_material_index = 0
+            material_indices = [none_material_index]
+
+        # Store the reference to the evaluated object and data so that we can clean them up later.
+        evaluated_mesh_object = None
+        evaluated_mesh_data = None
+
+        # Mesh data
         match options.object_eval_state:
             case 'ORIGINAL':
-                mesh_object = input_mesh_object
-                mesh_data = input_mesh_object.data
+                mesh_object = obj
+                mesh_data = typing_cast(Mesh, obj.data)
             case 'EVALUATED':
                 # Create a copy of the mesh object after non-armature modifiers are applied.
-
-                # Temporarily force the armature into the rest position.
-                # We will undo this later.
-                old_pose_position = None
-                if armature_object is not None:
-                    old_pose_position = armature_object.data.pose_position
-                    armature_object.data.pose_position = 'REST'
-
                 depsgraph = context.evaluated_depsgraph_get()
                 bm = bmesh.new()
-                bm.from_object(input_mesh_object, depsgraph)
-                mesh_data = bpy.data.meshes.new('')
+
+                try:
+                    bm.from_object(obj, depsgraph)
+                except ValueError as e:
+                    del bm
+                    raise RuntimeError(f'Object "{obj.name}" is not evaluated.\n'
+                    'This is likely because the object is in a collection that has been excluded from the view layer.') from e
+
+                evaluated_mesh_data = bpy.data.meshes.new('')
+                mesh_data = evaluated_mesh_data
                 bm.to_mesh(mesh_data)
                 del bm
-                mesh_object = bpy.data.objects.new('', mesh_data)
-                mesh_object.matrix_world = input_mesh_object.matrix_world
+                evaluated_mesh_object = bpy.data.objects.new('', mesh_data)
+                mesh_object = evaluated_mesh_object
+                mesh_object.matrix_world = matrix_world
 
-                scale = (input_mesh_object.scale.x, input_mesh_object.scale.y, input_mesh_object.scale.z)
+                # Extract the scale from the matrix.
+                _, _, scale = matrix_world.decompose()
 
-                # Negative scaling in Blender results in inverted normals after the scale is applied. However, if the scale
-                # is not applied, the normals will appear unaffected in the viewport. The evaluated mesh data used in the
-                # export will have the scale applied, but this behavior is not obvious to the user.
+                # Negative scaling in Blender results in inverted normals after the scale is applied. However, if the
+                # scale is not applied, the normals will appear unaffected in the viewport. The evaluated mesh data used
+                # in the export will have the scale applied, but this behavior is not obvious to the user.
                 #
-                # In order to have the exporter be as WYSIWYG as possible, we need to check for negative scaling and invert
-                # the normals if necessary. If two axes have negative scaling and the third has positive scaling, the
-                # normals will be correct. We can detect this by checking if the number of negative scaling axes is odd. If
-                # it is, we need to invert the normals of the mesh by swapping the order of the vertices in each face.
-                should_flip_normals = sum(1 for x in scale if x < 0) % 2 == 1
+                # In order to have the exporter be as WYSIWYG as possible, we need to check for negative scaling and
+                # invert the normals if necessary. If two axes have negative scaling and the third has positive scaling,
+                # the normals will be correct. We can detect this by checking if the number of negative scaling axes is
+                # odd. If it is, we need to invert the normals of the mesh by swapping the order of the vertices in each
+                # face.
+                if not should_flip_normals:
+                    should_flip_normals = sum(1 for x in scale if x < 0) % 2 == 1
 
                 # Copy the vertex groups
-                for vertex_group in input_mesh_object.vertex_groups:
+                for vertex_group in obj.vertex_groups:
                     mesh_object.vertex_groups.new(name=vertex_group.name)
+            case _:
+                assert False, f'Invalid object evaluation state: {options.object_eval_state}'
 
-                # Restore the previous pose position on the armature.
-                if old_pose_position is not None:
-                    armature_object.data.pose_position = old_pose_position
+        match options.export_space:
+            case 'ARMATURE' | 'ROOT':
+                mesh_export_space_matrix = armature_mesh_export_space_matrices[armature_object]
+            case 'WORLD':
+                mesh_export_space_matrix = armature_mesh_export_space_matrices[armature_object]
+            case _:
+                assert False, f'Invalid export space: {options.export_space}'
 
+        vertex_transform_matrix = scale_matrix @ coordinate_system_matrix.inverted() @ mesh_export_space_matrix
+        point_transform_matrix = vertex_transform_matrix @ mesh_object.matrix_world
+
+        # Vertices
         vertex_offset = len(psk.points)
-
-        # VERTICES
         for vertex in mesh_data.vertices:
             point = Vector3()
-            v = mesh_object.matrix_world @ vertex.co
+            v = point_transform_matrix @ vertex.co
             point.x = v.x
             point.y = v.y
             point.z = v.z
             psk.points.append(point)
 
-        uv_layer = mesh_data.uv_layers.active.data
-
-        # WEDGES
+        # Wedges
         mesh_data.calc_loop_triangles()
 
+        if mesh_data.uv_layers.active is None:
+            warnings.append(f'"{mesh_object.name}" has no active UV Map')
+
         # Build a list of non-unique wedges.
         wedges = []
-        for loop_index, loop in enumerate(mesh_data.loops):
-            wedges.append(Psk.Wedge(
-                point_index=loop.vertex_index + vertex_offset,
-                u=uv_layer[loop_index].uv[0],
-                v=1.0 - uv_layer[loop_index].uv[1]
-            ))
+        if mesh_data.uv_layers.active:
+            uv_layer = mesh_data.uv_layers.active.data
+            for loop_index, loop in enumerate(mesh_data.loops):
+                wedges.append(Psk.Wedge(
+                    point_index=loop.vertex_index + vertex_offset,
+                    u=uv_layer[loop_index].uv[0],
+                    v=1.0 - uv_layer[loop_index].uv[1]
+                ))
+        else:
+            for loop_index, loop in enumerate(mesh_data.loops):
+                wedges.append(Psk.Wedge(point_index=loop.vertex_index + vertex_offset, u=0.0, v=0.0))
+
 
         # Assign material indices to the wedges.
         for triangle in mesh_data.loop_triangles:
             for loop_index in triangle.loops:
                 wedges[loop_index].material_index = material_indices[triangle.material_index]
 
-        # Populate the list of wedges with unique wedges & build a look-up table of loop indices to wedge indices
+        # Populate the list of wedges with unique wedges & build a look-up table of loop indices to wedge indices.
         wedge_indices = dict()
         loop_wedge_indices = np.full(len(mesh_data.loops), -1)
         for loop_index, wedge in enumerate(wedges):
@@ -269,34 +314,35 @@ def build_psk(context, input_objects: PskInputObjects, options: PskBuildOptions)
                 psk.wedges.append(wedge)
                 loop_wedge_indices[loop_index] = wedge_index
 
-        # FACES
+        # Faces
         poly_groups, groups = mesh_data.calc_smooth_groups(use_bitflags=True)
         psk_face_start_index = len(psk.faces)
         for f in mesh_data.loop_triangles:
-            face = Psk.Face()
-            face.material_index = material_indices[f.material_index]
-            face.wedge_indices[0] = loop_wedge_indices[f.loops[2]]
-            face.wedge_indices[1] = loop_wedge_indices[f.loops[1]]
-            face.wedge_indices[2] = loop_wedge_indices[f.loops[0]]
-            face.smoothing_groups = poly_groups[f.polygon_index]
+            face = Psk.Face(
+                wedge_indices=(loop_wedge_indices[f.loops[2]], loop_wedge_indices[f.loops[1]], loop_wedge_indices[f.loops[0]]),
+                material_index=material_indices[f.material_index],
+                smoothing_groups=poly_groups[f.polygon_index],
+            )
             psk.faces.append(face)
 
         if should_flip_normals:
             # Invert the normals of the faces.
             for face in psk.faces[psk_face_start_index:]:
-                face.wedge_indices[0], face.wedge_indices[2] = face.wedge_indices[2], face.wedge_indices[0]
+                face.wedge_indices = (face.wedge_indices[2], face.wedge_indices[1], face.wedge_indices[0])
 
-        # WEIGHTS
+        # Weights
         if armature_object is not None:
-            armature_data = typing.cast(Armature, armature_object.data)
+            armature_data = typing_cast(Armature, armature_object.data)
+            bone_index_offset = psx_bone_create_result.armature_object_root_bone_indices[armature_object]
             # Because the vertex groups may contain entries for which there is no matching bone in the armature,
             # we must filter them out and not export any weights for these vertex groups.
-            bone_names = [x.name for x in bones]
+
+            bone_names = psx_bone_create_result.armature_object_bone_names[armature_object]
             vertex_group_names = [x.name for x in mesh_object.vertex_groups]
-            vertex_group_bone_indices = dict()
+            vertex_group_bone_indices: dict[int, int] = dict()
             for vertex_group_index, vertex_group_name in enumerate(vertex_group_names):
                 try:
-                    vertex_group_bone_indices[vertex_group_index] = bone_names.index(vertex_group_name)
+                    vertex_group_bone_indices[vertex_group_index] = bone_names.index(vertex_group_name) + bone_index_offset
                 except ValueError:
                     # The vertex group does not have a matching bone in the list of bones to be exported.
                     # Check to see if there is an associated bone for this vertex group that exists in the armature.
@@ -306,8 +352,7 @@ def build_psk(context, input_objects: PskInputObjects, options: PskBuildOptions)
                         bone = armature_data.bones[vertex_group_name]
                         while bone is not None:
                             try:
-                                bone_index = bone_names.index(bone.name)
-                                vertex_group_bone_indices[vertex_group_index] = bone_index
+                                vertex_group_bone_indices[vertex_group_index] = bone_names.index(bone.name) + bone_index_offset
                                 break
                             except ValueError:
                                 bone = bone.parent
@@ -336,24 +381,34 @@ def build_psk(context, input_objects: PskInputObjects, options: PskBuildOptions)
                     psk.weights.append(w)
                     vertices_assigned_weights[vertex_index] = True
 
-            # Assign vertices that have not been assigned weights to the root bone.
+            # Assign vertices that have not been assigned weights to the root bone of the armature.
+            fallback_weight_bone_index = psx_bone_create_result.armature_object_root_bone_indices[armature_object]
             for vertex_index, assigned in enumerate(vertices_assigned_weights):
                 if not assigned:
                     w = Psk.Weight()
-                    w.bone_index = 0
+                    w.bone_index = fallback_weight_bone_index
                     w.point_index = vertex_offset + vertex_index
                     w.weight = 1.0
                     psk.weights.append(w)
 
-        if options.object_eval_state == 'EVALUATED':
+        if evaluated_mesh_object is not None:
             bpy.data.objects.remove(mesh_object)
+            del mesh_object
+
+        if evaluated_mesh_data is not None:
             bpy.data.meshes.remove(mesh_data)
             del mesh_data
 
         context.window_manager.progress_update(object_index)
 
+    # Restore the original pose position of the armature objects.
+    for armature_object, pose_position in original_armature_object_pose_positions.items():
+        armature_data = typing_cast(Armature, armature_object.data)
+        armature_data.pose_position = pose_position
+
+    # https://github.com/DarklightGames/io_scene_psk_psa/issues/129.
+    psk.sort_and_normalize_weights()
+
     context.window_manager.progress_end()
 
-    result.psk = psk
-
-    return result
+    return PskBuildResult(psk, warnings)

io_scene_psk_psa/psk/data.py

@@ -1,127 +0,0 @@
-from typing import List
-
-from ..shared.data import *
-
-
-class Psk(object):
-    class Wedge(object):
-        def __init__(self, point_index: int, u: float, v: float, material_index: int = 0):
-            self.point_index: int = point_index
-            self.u: float = u
-            self.v: float = v
-            self.material_index = material_index
-
-        def __hash__(self):
-            return hash(f'{self.point_index}-{self.u}-{self.v}-{self.material_index}')
-
-    class Wedge16(Structure):
-        _fields_ = [
-            ('point_index', c_uint32),
-            ('u', c_float),
-            ('v', c_float),
-            ('material_index', c_uint8),
-            ('reserved', c_int8),
-            ('padding2', c_int16)
-        ]
-
-    class Wedge32(Structure):
-        _fields_ = [
-            ('point_index', c_uint32),
-            ('u', c_float),
-            ('v', c_float),
-            ('material_index', c_uint32)
-        ]
-
-    class Face(Structure):
-        _fields_ = [
-            ('wedge_indices', c_uint16 * 3),
-            ('material_index', c_uint8),
-            ('aux_material_index', c_uint8),
-            ('smoothing_groups', c_int32)
-        ]
-
-    class Face32(Structure):
-        _pack_ = 1
-        _fields_ = [
-            ('wedge_indices', c_uint32 * 3),
-            ('material_index', c_uint8),
-            ('aux_material_index', c_uint8),
-            ('smoothing_groups', c_int32)
-        ]
-
-    class Material(Structure):
-        _fields_ = [
-            ('name', c_char * 64),
-            ('texture_index', c_int32),
-            ('poly_flags', c_int32),
-            ('aux_material', c_int32),
-            ('aux_flags', c_int32),
-            ('lod_bias', c_int32),
-            ('lod_style', c_int32)
-        ]
-
-    class Bone(Structure):
-        _fields_ = [
-            ('name', c_char * 64),
-            ('flags', c_int32),
-            ('children_count', c_int32),
-            ('parent_index', c_int32),
-            ('rotation', Quaternion),
-            ('location', Vector3),
-            ('length', c_float),
-            ('size', Vector3)
-        ]
-
-    class Weight(Structure):
-        _fields_ = [
-            ('weight', c_float),
-            ('point_index', c_int32),
-            ('bone_index', c_int32),
-        ]
-
-    class MorphInfo(Structure):
-        _fields_ = [
-            ('name', c_char * 64),
-            ('vertex_count', c_int32)
-        ]
-
-    class MorphData(Structure):
-        _fields_ = [
-            ('position_delta', Vector3),
-            ('tangent_z_delta', Vector3),
-            ('point_index', c_int32)
-        ]
-
-    @property
-    def has_extra_uvs(self):
-        return len(self.extra_uvs) > 0
-
-    @property
-    def has_vertex_colors(self):
-        return len(self.vertex_colors) > 0
-
-    @property
-    def has_vertex_normals(self):
-        return len(self.vertex_normals) > 0
-
-    @property
-    def has_material_references(self):
-        return len(self.material_references) > 0
-
-    @property
-    def has_morph_data(self):
-        return len(self.morph_infos) > 0
-    
-    def __init__(self):
-        self.points: List[Vector3] = []
-        self.wedges: List[Psk.Wedge] = []
-        self.faces: List[Psk.Face] = []
-        self.materials: List[Psk.Material] = []
-        self.weights: List[Psk.Weight] = []
-        self.bones: List[Psk.Bone] = []
-        self.extra_uvs: List[Vector2] = []
-        self.vertex_colors: List[Color] = []
-        self.vertex_normals: List[Vector3] = []
-        self.morph_infos: List[Psk.MorphInfo] = []
-        self.morph_data: List[Psk.MorphData] = []
-        self.material_references: List[str] = []

io_scene_psk_psa/psk/export/operators.py

@@ -1,84 +1,232 @@
-from typing import List
+from pathlib import Path
+from typing import Iterable, cast as typing_cast
 
 import bpy
-from bpy.props import StringProperty, BoolProperty, EnumProperty
-from bpy.types import Operator, Context, Object
+from bpy.props import StringProperty
+from bpy.types import Context, Depsgraph, Material, Object, Operator, Scene
 from bpy_extras.io_utils import ExportHelper
 
-from .properties import object_eval_state_items
-from ..builder import build_psk, PskBuildOptions, get_psk_input_objects_for_context, \
-    get_psk_input_objects_for_collection
-from ..writer import write_psk
-from ...shared.helpers import populate_bone_collection_list
+from .properties import PSK_PG_export, PskExportMixin
+from ..builder import (
+    PskBuildOptions,
+    build_psk,
+    get_materials_for_mesh_objects,
+)
+from psk_psa_py.psk.writer import write_psk_to_path
+from ...shared.helpers import PsxBoneCollection, get_collection_export_operator_from_context, get_psk_input_objects_for_collection, populate_bone_collection_list, get_psk_input_objects_for_context
+from ...shared.ui import draw_bone_filter_mode
+from ...shared.operators import PSK_OT_bone_collection_list_populate, PSK_OT_bone_collection_list_select_all
 
 
-def is_bone_filter_mode_item_available(context, identifier):
-    input_objects = get_psk_input_objects_for_context(context)
-    armature_object = input_objects.armature_object
-    if identifier == 'BONE_COLLECTIONS':
-        if armature_object is None or armature_object.data is None or len(armature_object.data.collections) == 0:
-            return False
-    return True
+def populate_material_name_list(depsgraph: Depsgraph, mesh_objects: Iterable[Object], material_list):
+    materials = list(get_materials_for_mesh_objects(depsgraph, mesh_objects))
 
+    # Order the mesh object materials by the order any existing entries in the material list.
+    # This way, if the user has already set up the material list, we don't change the order.
+    material_names = [x.material_name for x in material_list]
+    materials = get_sorted_materials_by_names(materials, material_names)
 
-def get_materials_for_mesh_objects(mesh_objects: List[Object]):
-    materials = []
-    for mesh_object in mesh_objects:
-        for i, material_slot in enumerate(mesh_object.material_slots):
-            material = material_slot.material
-            if material is None:
-                raise RuntimeError('Material slot cannot be empty (index ' + str(i) + ')')
-            if material not in materials:
-                materials.append(material)
-    return materials
-
-def populate_material_list(mesh_objects, material_list):
-    materials =  get_materials_for_mesh_objects(mesh_objects)
     material_list.clear()
     for index, material in enumerate(materials):
         m = material_list.add()
-        m.material = material
+        m.material_name = material.name if material is not None else 'None'
         m.index = index
 
 
+class PSK_OT_populate_material_name_list(Operator):
+    bl_idname = 'psk.export_populate_material_name_list'
+    bl_label = 'Populate Material Name List'
+    bl_description = 'Populate the material name list from the objects that will be used in this export'
+    bl_options = {'INTERNAL'}
+
+    def execute(self, context):
+        export_operator = get_collection_export_operator_from_context(context)
+        if export_operator is None:
+            self.report({'ERROR_INVALID_CONTEXT'}, 'No valid export operator found in context')
+            return {'CANCELLED'}
+        export_operator = typing_cast(PskExportMixin, export_operator)
+        depsgraph = context.evaluated_depsgraph_get()
+        assert context.collection
+        input_objects = get_psk_input_objects_for_collection(context.collection)
+        try:
+            populate_material_name_list(depsgraph, [x.obj for x in input_objects.mesh_dfs_objects], export_operator.material_name_list)
+        except RuntimeError as e:
+            self.report({'ERROR_INVALID_CONTEXT'}, str(e))
+            return {'CANCELLED'}
+        return {'FINISHED'}
+
+
+
+def material_list_names_search_cb(self, context: Context, edit_text: str):
+    for material in bpy.data.materials:
+        yield material.name
+
+
+class PSK_OT_material_list_name_add(Operator):
+    bl_idname = 'psk.export_material_name_list_item_add'
+    bl_label = 'Add Material'
+    bl_description = 'Add a material to the material name list (useful if you want to add a material slot that is not actually used in the mesh)'
+    bl_options = {'INTERNAL'}
+
+    name: StringProperty(search=material_list_names_search_cb, name='Material Name', default='None')
+
+    def invoke(self, context, event):
+        assert context.window_manager
+        return context.window_manager.invoke_props_dialog(self)
+
+    def execute(self, context):
+        export_operator = get_collection_export_operator_from_context(context)
+        if export_operator is None:
+            self.report({'ERROR_INVALID_CONTEXT'}, 'No valid export operator found in context')
+            return {'CANCELLED'}
+        export_operator = typing_cast(PskExportMixin, export_operator)
+        m = export_operator.material_name_list.add()
+        m.material_name = self.name
+        m.index = len(export_operator.material_name_list) - 1
+        return {'FINISHED'}
+
+
+
 class PSK_OT_material_list_move_up(Operator):
-    bl_idname = 'psk_export.material_list_item_move_up'
+    bl_idname = 'psk.export_material_list_item_move_up'
     bl_label = 'Move Up'
     bl_options = {'INTERNAL'}
     bl_description = 'Move the selected material up one slot'
 
     @classmethod
     def poll(cls, context):
-        pg = getattr(context.scene, 'psk_export')
-        return pg.material_list_index > 0
+        pg = typing_cast(PSK_PG_export, getattr(context.scene, 'psk_export'))
+        return pg.material_name_list_index > 0
 
     def execute(self, context):
-        pg = getattr(context.scene, 'psk_export')
-        pg.material_list.move(pg.material_list_index, pg.material_list_index - 1)
-        pg.material_list_index -= 1
+        pg = typing_cast(PSK_PG_export, getattr(context.scene, 'psk_export'))
+        pg.material_name_list.move(pg.material_name_list_index, pg.material_name_list_index - 1)
+        pg.material_name_list_index -= 1
         return {'FINISHED'}
 
 
 class PSK_OT_material_list_move_down(Operator):
-    bl_idname = 'psk_export.material_list_item_move_down'
+    bl_idname = 'psk.export_material_list_item_move_down'
     bl_label = 'Move Down'
     bl_options = {'INTERNAL'}
     bl_description = 'Move the selected material down one slot'
 
     @classmethod
     def poll(cls, context):
-        pg = getattr(context.scene, 'psk_export')
-        return pg.material_list_index < len(pg.material_list) - 1
+        pg = typing_cast(PSK_PG_export, getattr(context.scene, 'psk_export'))
+        return pg.material_name_list_index < len(pg.material_name_list) - 1
 
     def execute(self, context):
-        pg = getattr(context.scene, 'psk_export')
-        pg.material_list.move(pg.material_list_index, pg.material_list_index + 1)
-        pg.material_list_index += 1
+        pg = typing_cast(PSK_PG_export, getattr(context.scene, 'psk_export'))
+        pg.material_name_list.move(pg.material_name_list_index, pg.material_name_list_index + 1)
+        pg.material_name_list_index += 1
         return {'FINISHED'}
 
 
-class PSK_OT_export_collection(Operator, ExportHelper):
-    bl_idname = 'export.psk_collection'
+class PSK_OT_material_list_name_move_up(Operator):
+    bl_idname = 'psk.export_material_name_list_item_move_up'
+    bl_label = 'Move Up'
+    bl_options = {'INTERNAL'}
+    bl_description = 'Move the selected material name up one slot'
+
+    @classmethod
+    def poll(cls, context):
+        export_operator = get_collection_export_operator_from_context(context)
+        if export_operator is None:
+            return False
+        export_operator = typing_cast(PskExportMixin, export_operator)
+        return export_operator.material_name_list_index > 0
+
+    def execute(self, context):
+        export_operator = get_collection_export_operator_from_context(context)
+        if export_operator is None:
+            self.report({'ERROR_INVALID_CONTEXT'}, 'No valid export operator found in context')
+            return {'CANCELLED'}
+        export_operator = typing_cast(PskExportMixin, export_operator)
+        export_operator.material_name_list.move(export_operator.material_name_list_index, export_operator.material_name_list_index - 1)
+        export_operator.material_name_list_index -= 1
+        return {'FINISHED'}
+
+
+class PSK_OT_material_list_name_move_down(Operator):
+    bl_idname = 'psk.export_material_name_list_item_move_down'
+    bl_label = 'Move Down'
+    bl_options = {'INTERNAL'}
+    bl_description = 'Move the selected material name down one slot'
+
+    @classmethod
+    def poll(cls, context):
+        export_operator = get_collection_export_operator_from_context(context)
+        if export_operator is None:
+            return False
+        export_operator = typing_cast(PskExportMixin, export_operator)
+        return export_operator.material_name_list_index < len(export_operator.material_name_list) - 1
+
+    def execute(self, context):
+        export_operator = get_collection_export_operator_from_context(context)
+        if export_operator is None:
+            self.report({'ERROR_INVALID_CONTEXT'}, 'No valid export operator found in context')
+            return {'CANCELLED'}
+        export_operator = typing_cast(PskExportMixin, export_operator)
+        export_operator.material_name_list.move(export_operator.material_name_list_index, export_operator.material_name_list_index + 1)
+        export_operator.material_name_list_index += 1
+        return {'FINISHED'}
+
+
+def get_sorted_materials_by_names(materials: Iterable[Material | None], material_names: list[str]) -> list[Material | None]:
+    """
+    Sorts the materials by the order of the material names list. Any materials not in the list will be appended to the
+    end of the list in the order they are found. None materials (representing empty material slots) are always
+    appended at the very end.
+
+    @param materials: A list of materials to sort (can include None)
+    @param material_names: A list of material names to sort by
+    @return: A sorted list of materials (with None at the end if present)
+    """
+    materials = list(materials)
+    has_none = None in materials
+    materials = [m for m in materials if m is not None]
+    
+    materials_in_collection = [m for m in materials if m.name in material_names]
+    materials_not_in_collection = [m for m in materials if m.name not in material_names]
+    materials_in_collection = sorted(materials_in_collection, key=lambda x: material_names.index(x.name))
+    
+    result: list[Material | None] = []
+    result.extend(materials_in_collection)
+    result.extend(materials_not_in_collection)
+    
+    if has_none:
+        result.append(None)
+    
+    return result
+
+
+def get_psk_build_options_from_property_group(scene: Scene, pg: PskExportMixin) -> PskBuildOptions:
+    options = PskBuildOptions()
+    options.object_eval_state = pg.object_eval_state
+    options.export_space = pg.export_space
+    options.bone_filter_mode = pg.bone_filter_mode
+    options.bone_collection_indices = [PsxBoneCollection(x.armature_object_name, x.armature_data_name, x.index) for x in pg.bone_collection_list if x.is_selected]
+    options.material_order_mode = pg.material_order_mode
+    options.material_name_list = [x.material_name for x in pg.material_name_list]
+    
+    match pg.transform_source:
+        case 'SCENE':
+            transform_source = getattr(scene, 'psx_export')
+        case 'CUSTOM':
+            transform_source = pg
+        case _:
+            assert False, f'Invalid transform source: {pg.transform_source}'
+    
+    options.scale = transform_source.scale
+    options.forward_axis = transform_source.forward_axis
+    options.up_axis = transform_source.up_axis
+
+    return options
+
+
+class PSK_OT_export_collection(Operator, ExportHelper, PskExportMixin):
+    bl_idname = 'psk.export_collection'
     bl_label = 'Export'
     bl_options = {'INTERNAL'}
     filename_ext = '.psk'
@@ -91,20 +239,11 @@ class PSK_OT_export_collection(Operator, ExportHelper):
         subtype='FILE_PATH')
     collection: StringProperty(options={'HIDDEN'})
 
-    object_eval_state: EnumProperty(
-        items=object_eval_state_items,
-        name='Object Evaluation State',
-        default='EVALUATED'
-    )
-    should_enforce_bone_name_restrictions: BoolProperty(
-        default=False,
-        name='Enforce Bone Name Restrictions',
-        description='Enforce that bone names must only contain letters, numbers, spaces, hyphens and underscores.\n\n'
-                    'Depending on the engine, improper bone names might not be referenced correctly by scripts'
-    )
-
     def execute(self, context):
-        collection = bpy.data.collections.get(self.collection)
+        collection = bpy.data.collections.get(self.collection, None)
+
+        assert collection is not None
+        assert context.scene is not None
 
         try:
             input_objects = get_psk_input_objects_for_collection(collection)
@@ -112,21 +251,21 @@ class PSK_OT_export_collection(Operator, ExportHelper):
             self.report({'ERROR_INVALID_CONTEXT'}, str(e))
             return {'CANCELLED'}
 
-        options = PskBuildOptions()
-        options.bone_filter_mode = 'ALL'
-        options.object_eval_state = self.object_eval_state
-        options.materials = get_materials_for_mesh_objects(input_objects.mesh_objects)
-        options.should_enforce_bone_name_restrictions = self.should_enforce_bone_name_restrictions
+        options = get_psk_build_options_from_property_group(context.scene, self)
+        filepath = str(Path(self.filepath).resolve())
 
         try:
             result = build_psk(context, input_objects, options)
             for warning in result.warnings:
                 self.report({'WARNING'}, warning)
-            write_psk(result.psk, self.filepath)
+            write_psk_to_path(result.psk, filepath)
             if len(result.warnings) > 0:
                 self.report({'WARNING'}, f'PSK export successful with {len(result.warnings)} warnings')
             else:
                 self.report({'INFO'}, f'PSK export successful')
+        except IOError as e:
+            self.report({'ERROR'}, f'Failed to write PSK file ({filepath}): {e}')
+            return {'CANCELLED'}
         except RuntimeError as e:
             self.report({'ERROR_INVALID_CONTEXT'}, str(e))
             return {'CANCELLED'}
@@ -136,7 +275,13 @@ class PSK_OT_export_collection(Operator, ExportHelper):
     def draw(self, context: Context):
         layout = self.layout
 
-        # MESH
+        assert layout is not None
+
+        flow = layout.grid_flow(row_major=True)
+        flow.use_property_split = True
+        flow.use_property_decorate = False
+
+        # Mesh
         mesh_header, mesh_panel = layout.panel('Mesh', default_closed=False)
         mesh_header.label(text='Mesh', icon='MESH_DATA')
         if mesh_panel:
@@ -145,24 +290,81 @@ class PSK_OT_export_collection(Operator, ExportHelper):
             flow.use_property_decorate = False
             flow.prop(self, 'object_eval_state', text='Data')
 
-        # BONES
+        # Bones
         bones_header, bones_panel = layout.panel('Bones', default_closed=False)
         bones_header.label(text='Bones', icon='BONE_DATA')
         if bones_panel:
-            flow = bones_panel.grid_flow(row_major=True)
+            draw_bone_filter_mode(bones_panel, self, True)
+
+            if self.bone_filter_mode == 'BONE_COLLECTIONS':
+                row = bones_panel.row()
+                rows = max(3, min(len(self.bone_collection_list), 10))
+                row.template_list('PSX_UL_bone_collection_list', '', self, 'bone_collection_list', self, 'bone_collection_list_index', rows=rows)
+                col = row.column(align=True)
+                col.operator(PSK_OT_bone_collection_list_populate.bl_idname, text='', icon='FILE_REFRESH')
+                col.separator()
+                op = col.operator(PSK_OT_bone_collection_list_select_all.bl_idname, text='', icon='CHECKBOX_HLT')
+                op.is_selected = True
+                op = col.operator(PSK_OT_bone_collection_list_select_all.bl_idname, text='', icon='CHECKBOX_DEHLT')
+                op.is_selected = False
+
+        # Materials
+        materials_header, materials_panel = layout.panel('Materials', default_closed=False)
+        materials_header.label(text='Materials', icon='MATERIAL')
+
+        if materials_panel:
+            flow = materials_panel.grid_flow(row_major=True)
             flow.use_property_split = True
             flow.use_property_decorate = False
-            flow.prop(self, 'should_enforce_bone_name_restrictions')
+            flow.prop(self, 'material_order_mode', text='Material Order')
+
+            if self.material_order_mode == 'MANUAL':
+                rows = max(3, min(len(self.material_name_list), 10))
+                row = materials_panel.row()
+                row.template_list('PSK_UL_material_names', '', self, 'material_name_list', self, 'material_name_list_index', rows=rows)
+                col = row.column(align=True)
+                col.operator(PSK_OT_populate_material_name_list.bl_idname, text='', icon='FILE_REFRESH')
+                col.separator()
+                col.operator(PSK_OT_material_list_name_move_up.bl_idname, text='', icon='TRIA_UP')
+                col.operator(PSK_OT_material_list_name_move_down.bl_idname, text='', icon='TRIA_DOWN')
+                col.separator()
+                col.operator(PSK_OT_material_list_name_add.bl_idname, text='', icon='ADD')
+
+        # Transform
+        transform_header, transform_panel = layout.panel('Transform', default_closed=False)
+        transform_header.label(text='Transform')
+        if transform_panel:
+            flow = transform_panel.grid_flow(row_major=True)
+            flow.use_property_split = True
+            flow.use_property_decorate = False
+            flow.prop(self, 'export_space')
+            flow.prop(self, 'transform_source')
+
+            flow = transform_panel.grid_flow(row_major=True)
+            flow.use_property_split = True
+            flow.use_property_decorate = False
+
+            match self.transform_source:
+                case 'SCENE':
+                    transform_source = getattr(context.scene, 'psx_export')
+                    flow.enabled = False
+                case 'CUSTOM':
+                    transform_source = self
+                case _:
+                    assert False, f'Invalid transform source: {self.transform_source}'
+        
+            flow.prop(transform_source, 'scale')
+            flow.prop(transform_source, 'forward_axis')
+            flow.prop(transform_source, 'up_axis')
 
 
 class PSK_OT_export(Operator, ExportHelper):
-    bl_idname = 'export.psk'
+    bl_idname = 'psk.export'
     bl_label = 'Export'
     bl_options = {'INTERNAL', 'UNDO'}
-    __doc__ = 'Export mesh and armature to PSK'
+    bl_description = 'Export selected meshes to PSK'
     filename_ext = '.psk'
     filter_glob: StringProperty(default='*.psk', options={'HIDDEN'})
-
     filepath: StringProperty(
         name='File Path',
         description='File path used for exporting the PSK file',
@@ -176,35 +378,31 @@ class PSK_OT_export(Operator, ExportHelper):
             self.report({'ERROR_INVALID_CONTEXT'}, str(e))
             return {'CANCELLED'}
 
-        pg = getattr(context.scene, 'psk_export')
+        pg = typing_cast(PSK_PG_export, getattr(context.scene, 'psk_export'))
 
-        populate_bone_collection_list(input_objects.armature_object, pg.bone_collection_list)
+        populate_bone_collection_list(pg.bone_collection_list, input_objects.armature_objects)
+
+        depsgraph = context.evaluated_depsgraph_get()
 
         try:
-            populate_material_list(input_objects.mesh_objects, pg.material_list)
+            populate_material_name_list(depsgraph, [x.obj for x in input_objects.mesh_dfs_objects], pg.material_name_list)
         except RuntimeError as e:
             self.report({'ERROR_INVALID_CONTEXT'}, str(e))
             return {'CANCELLED'}
 
+        assert context.window_manager
         context.window_manager.fileselect_add(self)
 
         return {'RUNNING_MODAL'}
 
-    @classmethod
-    def poll(cls, context):
-        try:
-            get_psk_input_objects_for_context(context)
-        except RuntimeError as e:
-            cls.poll_message_set(str(e))
-            return False
-        return True
-
     def draw(self, context):
         layout = self.layout
 
-        pg = getattr(context.scene, 'psk_export')
+        assert layout
 
-        # MESH
+        pg = typing_cast(PSK_PG_export, getattr(context.scene, 'psk_export'))
+
+        # Mesh
         mesh_header, mesh_panel = layout.panel('Mesh', default_closed=False)
         mesh_header.label(text='Mesh', icon='MESH_DATA')
         if mesh_panel:
@@ -213,57 +411,89 @@ class PSK_OT_export(Operator, ExportHelper):
             flow.use_property_decorate = False
             flow.prop(pg, 'object_eval_state', text='Data')
 
-        # BONES
+        # Bones
         bones_header, bones_panel = layout.panel('Bones', default_closed=False)
         bones_header.label(text='Bones', icon='BONE_DATA')
         if bones_panel:
-            bone_filter_mode_items = pg.bl_rna.properties['bone_filter_mode'].enum_items_static
-            row = bones_panel.row(align=True)
-            for item in bone_filter_mode_items:
-                identifier = item.identifier
-                item_layout = row.row(align=True)
-                item_layout.prop_enum(pg, 'bone_filter_mode', item.identifier)
-                item_layout.enabled = is_bone_filter_mode_item_available(context, identifier)
-
+            draw_bone_filter_mode(bones_panel, pg)
             if pg.bone_filter_mode == 'BONE_COLLECTIONS':
                 row = bones_panel.row()
                 rows = max(3, min(len(pg.bone_collection_list), 10))
                 row.template_list('PSX_UL_bone_collection_list', '', pg, 'bone_collection_list', pg, 'bone_collection_list_index', rows=rows)
 
-            bones_panel.prop(pg, 'should_enforce_bone_name_restrictions')
-
-        # MATERIALS
+        # Materials
         materials_header, materials_panel = layout.panel('Materials', default_closed=False)
         materials_header.label(text='Materials', icon='MATERIAL')
         if materials_panel:
-            row = materials_panel.row()
-            rows = max(3, min(len(pg.bone_collection_list), 10))
-            row.template_list('PSK_UL_materials', '', pg, 'material_list', pg, 'material_list_index', rows=rows)
-            col = row.column(align=True)
-            col.operator(PSK_OT_material_list_move_up.bl_idname, text='', icon='TRIA_UP')
-            col.operator(PSK_OT_material_list_move_down.bl_idname, text='', icon='TRIA_DOWN')
+            flow = materials_panel.grid_flow(row_major=True)
+            flow.use_property_split = True
+            flow.use_property_decorate = False
+            flow.prop(pg, 'material_order_mode', text='Material Order')
+
+            if pg.material_order_mode == 'MANUAL':
+                row = materials_panel.row()
+                rows = max(3, min(len(pg.bone_collection_list), 10))
+                row.template_list('PSK_UL_material_names', '', pg, 'material_name_list', pg, 'material_name_list_index', rows=rows)
+                col = row.column(align=True)
+                col.operator(PSK_OT_material_list_move_up.bl_idname, text='', icon='TRIA_UP')
+                col.operator(PSK_OT_material_list_move_down.bl_idname, text='', icon='TRIA_DOWN')
+
+        # Transform
+        transform_header, transform_panel = layout.panel('Transform', default_closed=False)
+        transform_header.label(text='Transform')
+        if transform_panel:
+            flow = transform_panel.grid_flow(row_major=True)
+            flow.use_property_split = True
+            flow.use_property_decorate = False
+            flow.prop(pg, 'export_space')
+            flow.prop(pg, 'transform_source')
+
+            flow = transform_panel.grid_flow(row_major=True)
+            flow.use_property_split = True
+            flow.use_property_decorate = False
+
+            match pg.transform_source:
+                case 'SCENE':
+                    transform_source = getattr(context.scene, 'psx_export')
+                    flow.enabled = False
+                case 'CUSTOM':
+                    transform_source = pg
+                case _:
+                    assert False, f'Invalid transform source: {pg.transform_source}'
+        
+            flow.prop(transform_source, 'scale')
+            flow.prop(transform_source, 'forward_axis')
+            flow.prop(transform_source, 'up_axis')
+        
+        # Extended Format
+        extended_format_header, extended_format_panel = layout.panel('Extended Format', default_closed=False)
+        extended_format_header.label(text='Extended Format')
+        if extended_format_panel:
+            flow = extended_format_panel.grid_flow(row_major=True)
+            flow.use_property_split = True
+            flow.use_property_decorate = False
+            flow.prop(pg, 'should_export_vertex_normals', text='Vertex Normals')
 
     def execute(self, context):
         pg = getattr(context.scene, 'psk_export')
 
-        input_objects = get_psk_input_objects_for_context(context)
+        assert context.scene
 
-        options = PskBuildOptions()
-        options.bone_filter_mode = pg.bone_filter_mode
-        options.bone_collection_indices = [x.index for x in pg.bone_collection_list if x.is_selected]
-        options.object_eval_state = pg.object_eval_state
-        options.materials = [m.material for m in pg.material_list]
-        options.should_enforce_bone_name_restrictions = pg.should_enforce_bone_name_restrictions
+        input_objects = get_psk_input_objects_for_context(context)
+        options = get_psk_build_options_from_property_group(context.scene, pg)
 
         try:
             result = build_psk(context, input_objects, options)
             for warning in result.warnings:
                 self.report({'WARNING'}, warning)
-            write_psk(result.psk, self.filepath)
+            write_psk_to_path(result.psk, self.filepath)
             if len(result.warnings) > 0:
                 self.report({'WARNING'}, f'PSK export successful with {len(result.warnings)} warnings')
             else:
                 self.report({'INFO'}, f'PSK export successful')
+        except IOError as e:
+            self.report({'ERROR'}, f'Failed to write PSK file ({self.filepath}): {e}')
+            return {'CANCELLED'}
         except RuntimeError as e:
             self.report({'ERROR_INVALID_CONTEXT'}, str(e))
             return {'CANCELLED'}
@@ -271,9 +501,16 @@ class PSK_OT_export(Operator, ExportHelper):
         return {'FINISHED'}
 
 
-classes = (
+_classes = (
     PSK_OT_material_list_move_up,
     PSK_OT_material_list_move_down,
     PSK_OT_export,
     PSK_OT_export_collection,
+    PSK_OT_populate_material_name_list,
+    PSK_OT_material_list_name_move_up,
+    PSK_OT_material_list_name_move_down,
+    PSK_OT_material_list_name_add,
 )
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)

io_scene_psk_psa/psk/export/properties.py

@@ -1,50 +1,60 @@
-from bpy.props import EnumProperty, CollectionProperty, IntProperty, BoolProperty, PointerProperty
-from bpy.types import PropertyGroup, Material
-
-from ...shared.types import PSX_PG_bone_collection_list_item
-
-empty_set = set()
+from bpy.props import (
+    BoolProperty,
+    CollectionProperty,
+    EnumProperty,
+    IntProperty,
+    StringProperty,
+)
+from bpy.types import PropertyGroup
 
+from ...shared.types import ExportSpaceMixin, TransformMixin, PsxBoneExportMixin, TransformSourceMixin
 
 object_eval_state_items = (
     ('EVALUATED', 'Evaluated', 'Use data from fully evaluated object'),
     ('ORIGINAL', 'Original', 'Use data from original object with no modifiers applied'),
 )
 
-class PSK_PG_material_list_item(PropertyGroup):
-    material: PointerProperty(type=Material)
+material_order_mode_items = (
+    ('AUTOMATIC', 'Automatic', 'Automatically order the materials'),
+    ('MANUAL', 'Manual', 'Manually arrange the materials'),
+)
+
+
+class PSK_PG_material_name_list_item(PropertyGroup):
+    material_name: StringProperty()
     index: IntProperty()
 
 
-class PSK_PG_export(PropertyGroup):
-    bone_filter_mode: EnumProperty(
-        name='Bone Filter',
-        options=empty_set,
-        description='',
-        items=(
-            ('ALL', 'All', 'All bones will be exported'),
-            ('BONE_COLLECTIONS', 'Bone Collections',
-             'Only bones belonging to the selected bone collections and their ancestors will be exported')
-        )
-    )
-    bone_collection_list: CollectionProperty(type=PSX_PG_bone_collection_list_item)
-    bone_collection_list_index: IntProperty(default=0)
+class PskExportMixin(ExportSpaceMixin, TransformMixin, PsxBoneExportMixin, TransformSourceMixin):
     object_eval_state: EnumProperty(
         items=object_eval_state_items,
         name='Object Evaluation State',
         default='EVALUATED'
     )
-    material_list: CollectionProperty(type=PSK_PG_material_list_item)
-    material_list_index: IntProperty(default=0)
-    should_enforce_bone_name_restrictions: BoolProperty(
+    material_order_mode: EnumProperty(
+        name='Material Order',
+        description='The order in which to export the materials',
+        items=material_order_mode_items,
+        default='AUTOMATIC'
+    )
+    material_name_list: CollectionProperty(type=PSK_PG_material_name_list_item)
+    material_name_list_index: IntProperty(default=0)
+    should_export_vertex_normals: BoolProperty(
+        name='Export Vertex Normals',
         default=False,
-        name='Enforce Bone Name Restrictions',
-        description='Enforce that bone names must only contain letters, numbers, spaces, hyphens and underscores.\n\n'
-                    'Depending on the engine, improper bone names might not be referenced correctly by scripts'
+        description='Export VTXNORMS section.'
     )
 
 
-classes = (
-    PSK_PG_material_list_item,
+class PSK_PG_export(PropertyGroup, PskExportMixin):
+    pass
+
+
+_classes = (
+    PSK_PG_material_name_list_item,
     PSK_PG_export,
 )
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)
+

io_scene_psk_psa/psk/export/properties.pyi

@@ -0,0 +1,18 @@
+from ...shared.types import BpyCollectionProperty, ExportSpaceMixin, TransformMixin, PsxBoneExportMixin, TransformSourceMixin
+
+
+class PSK_PG_material_name_list_item:
+    material_name: str
+    index: int
+
+
+class PskExportMixin(ExportSpaceMixin, TransformMixin, PsxBoneExportMixin, TransformSourceMixin):
+    object_eval_state: str
+    material_order_mode: str
+    material_name_list: BpyCollectionProperty[PSK_PG_material_name_list_item]
+    material_name_list_index: int
+    should_export_vertex_normals: bool
+
+
+class PSK_PG_export(PskExportMixin):
+    pass

io_scene_psk_psa/psk/export/ui.py

@@ -1,12 +1,48 @@
+import bpy
 from bpy.types import UIList
+from typing import cast as typing_cast
+
+from .properties import PSK_PG_material_name_list_item
 
 
-class PSK_UL_materials(UIList):
-    def draw_item(self, context, layout, data, item, icon, active_data, active_propname, index):
+class PSK_UL_material_names(UIList):
+    def draw_item(
+        self,
+        context,
+        layout,
+        data,
+        item,
+        icon,
+        active_data,
+        active_property,
+        index,
+        flt_flag
+    ):
         row = layout.row()
-        row.prop(item.material, 'name', text='', emboss=False, icon_value=layout.icon(item.material))
+        item = typing_cast(PSK_PG_material_name_list_item, item)
+        material = bpy.data.materials.get(item.material_name, None)
+
+        # If the material is not found by name and the name is not 'None', show a not found icon
+        if item.material_name == 'None':
+            icon = 'NODE_MATERIAL'
+        else:
+            icon = 'NOT_FOUND' if material is None else 'NONE'
+
+        row.prop(item, 'material_name', text='', emboss=False,
+                 icon_value=layout.icon(material) if material else 0,
+                 icon=icon)
+
+        # Add right-aligned "Not Found" label if material is not found
+        if item.material_name != 'None' and material is None:
+            label_row = row.row()
+            label_row.alignment = 'RIGHT'
+            label_row.enabled = False
+            label_row.label(text='Not Found')
 
 
-classes = (
-    PSK_UL_materials,
+_classes = (
+    PSK_UL_material_names,
 )
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)

io_scene_psk_psa/psk/import_/operators.py

@@ -1,33 +1,86 @@
 import os
-import sys
+from pathlib import Path
 
-from bpy.props import StringProperty, BoolProperty, EnumProperty, FloatProperty
-from bpy.types import Operator, FileHandler, Context
+from bpy.props import CollectionProperty, StringProperty
+from bpy.types import Context, FileHandler, Operator, OperatorFileListElement, UILayout
 from bpy_extras.io_utils import ImportHelper
 
 from ..importer import PskImportOptions, import_psk
-from ..reader import read_psk
-
-empty_set = set()
+from ..properties import PskImportMixin
+from psk_psa_py.psk.reader import read_psk_from_file
 
 
-class PSK_FH_import(FileHandler):
-    bl_idname = 'PSK_FH_import'
-    bl_label = 'Unreal PSK'
-    bl_import_operator = 'import_scene.psk'
-    bl_export_operator = 'export.psk_collection'
-    bl_file_extensions = '.psk;.pskx'
+def get_psk_import_options_from_properties(property_group: PskImportMixin):
+    options = PskImportOptions()
+    options.should_import_mesh = property_group.should_import_mesh
+    options.should_import_extra_uvs = property_group.should_import_extra_uvs
+    options.should_import_vertex_colors = property_group.should_import_vertex_colors
+    options.should_import_vertex_normals = property_group.should_import_vertex_normals
+    options.vertex_color_space = property_group.vertex_color_space
+    options.should_import_armature = property_group.should_import_armature
+    options.bone_length = property_group.bone_length
+    options.should_import_materials = property_group.should_import_materials
+    options.should_import_shape_keys = property_group.should_import_shape_keys
+    options.scale = property_group.scale
 
-    @classmethod
-    def poll_drop(cls, context: Context):
-        return context.area and context.area.type == 'VIEW_3D'
+    if property_group.bdk_repository_id:
+        options.bdk_repository_id = property_group.bdk_repository_id
+
+    return options
 
 
-class PSK_OT_import(Operator, ImportHelper):
-    bl_idname = 'import_scene.psk'
+def psk_import_draw(layout: UILayout, props: PskImportMixin):
+    row = layout.row()
+
+    col = row.column()
+    col.use_property_split = True
+    col.use_property_decorate = False
+    col.prop(props, 'components')
+
+    if props.should_import_mesh:
+        mesh_header, mesh_panel = layout.panel('mesh_panel_id', default_closed=False)
+        mesh_header.label(text='Mesh', icon='MESH_DATA')
+
+        if mesh_panel:
+            row = mesh_panel.row()
+            col = row.column()
+            col.use_property_split = True
+            col.use_property_decorate = False
+            col.prop(props, 'should_import_extra_uvs', text='Extra UVs')
+            col.prop(props, 'should_import_materials', text='Materials')
+            col.prop(props, 'should_import_vertex_colors', text='Vertex Colors')
+            if props.should_import_vertex_colors:
+                col.prop(props, 'vertex_color_space')
+            col.separator()
+            col.prop(props, 'should_import_vertex_normals', text='Vertex Normals')
+            col.prop(props, 'should_import_shape_keys', text='Shape Keys')
+
+    if props.should_import_armature:
+        armature_header, armature_panel = layout.panel('armature_panel_id', default_closed=False)
+        armature_header.label(text='Armature', icon='OUTLINER_DATA_ARMATURE')
+
+        if armature_panel:
+            row = armature_panel.row()
+            col = row.column()
+            col.use_property_split = True
+            col.use_property_decorate = False
+            col.prop(props, 'bone_length')
+
+    transform_header, transform_panel = layout.panel('transform_panel_id', default_closed=False)
+    transform_header.label(text='Transform')
+    if transform_panel:
+        row = transform_panel.row()
+        col = row.column()
+        col.use_property_split = True
+        col.use_property_decorate = False
+        col.prop(props, 'scale')
+
+
+class PSK_OT_import(Operator, ImportHelper, PskImportMixin):
+    bl_idname = 'psk.import_file'
     bl_label = 'Import'
     bl_options = {'INTERNAL', 'UNDO', 'PRESET'}
-    __doc__ = 'Load a PSK file'
+    bl_description = 'Import a PSK file'
     filename_ext = '.psk'
     filter_glob: StringProperty(default='*.psk;*.pskx', options={'HIDDEN'})
     filepath: StringProperty(
@@ -36,151 +89,97 @@ class PSK_OT_import(Operator, ImportHelper):
         maxlen=1024,
         default='')
 
-    should_import_vertex_colors: BoolProperty(
-        default=True,
-        options=empty_set,
-        name='Import Vertex Colors',
-        description='Import vertex colors, if available'
-    )
-    vertex_color_space: EnumProperty(
-        name='Vertex Color Space',
-        options=empty_set,
-        description='The source vertex color space',
-        default='SRGBA',
-        items=(
-            ('LINEAR', 'Linear', ''),
-            ('SRGBA', 'sRGBA', ''),
-        )
-    )
-    should_import_vertex_normals: BoolProperty(
-        default=True,
-        name='Import Vertex Normals',
-        options=empty_set,
-        description='Import vertex normals, if available'
-    )
-    should_import_extra_uvs: BoolProperty(
-        default=True,
-        name='Import Extra UVs',
-        options=empty_set,
-        description='Import extra UV maps, if available'
-    )
-    should_import_mesh: BoolProperty(
-        default=True,
-        name='Import Mesh',
-        options=empty_set,
-        description='Import mesh'
-    )
-    should_import_materials: BoolProperty(
-        default=True,
-        name='Import Materials',
-        options=empty_set,
-    )
-    should_import_skeleton: BoolProperty(
-        default=True,
-        name='Import Skeleton',
-        options=empty_set,
-        description='Import skeleton'
-    )
-    bone_length: FloatProperty(
-        default=1.0,
-        min=sys.float_info.epsilon,
-        step=100,
-        soft_min=1.0,
-        name='Bone Length',
-        options=empty_set,
-        subtype='DISTANCE',
-        description='Length of the bones'
-    )
-    should_import_shape_keys: BoolProperty(
-        default=True,
-        name='Import Shape Keys',
-        options=empty_set,
-        description='Import shape keys, if available'
-    )
-    scale: FloatProperty(
-        name='Scale',
-        default=1.0,
-        soft_min=0.0,
-    )
-    bdk_repository_id: StringProperty(
-        name='BDK Repository ID',
-        default='',
-        options=empty_set,
-        description='The ID of the BDK repository to use for loading materials'
-    )
-
     def execute(self, context):
-        psk = read_psk(self.filepath)
-
-        options = PskImportOptions()
-        options.name = os.path.splitext(os.path.basename(self.filepath))[0]
-        options.should_import_mesh = self.should_import_mesh
-        options.should_import_extra_uvs = self.should_import_extra_uvs
-        options.should_import_vertex_colors = self.should_import_vertex_colors
-        options.should_import_vertex_normals = self.should_import_vertex_normals
-        options.vertex_color_space = self.vertex_color_space
-        options.should_import_skeleton = self.should_import_skeleton
-        options.bone_length = self.bone_length
-        options.should_import_materials = self.should_import_materials
-        options.should_import_shape_keys = self.should_import_shape_keys
-        options.scale = self.scale
-
-        if self.bdk_repository_id:
-            options.bdk_repository_id = self.bdk_repository_id
-
-        if not options.should_import_mesh and not options.should_import_skeleton:
-            self.report({'ERROR'}, 'Nothing to import')
+        try:
+            psk = read_psk_from_file(self.filepath)
+        except OSError as e:
+            self.report({'ERROR'}, f'Failed to read "{self.filepath}". The file may be corrupted or not a valid PSK file: {e}')
             return {'CANCELLED'}
 
-        result = import_psk(psk, context, options)
+        name = os.path.splitext(os.path.basename(self.filepath))[0]
+        options = get_psk_import_options_from_properties(self)
+        result = import_psk(psk, context, name, options)
 
         if len(result.warnings):
-            message = f'PSK imported with {len(result.warnings)} warning(s)\n'
+            message = f'PSK imported as "{result.root_object.name}" with {len(result.warnings)} warning(s)\n'
             message += '\n'.join(result.warnings)
             self.report({'WARNING'}, message)
         else:
-            self.report({'INFO'}, f'PSK imported ({options.name})')
+            self.report({'INFO'}, f'PSK imported as "{result.root_object.name}"')
 
         return {'FINISHED'}
 
     def draw(self, context):
-        layout = self.layout
-
-        row = layout.row()
-
-        col = row.column()
-        col.use_property_split = True
-        col.use_property_decorate = False
-        col.prop(self, 'scale')
-
-        mesh_header, mesh_panel = layout.panel('mesh_panel_id', default_closed=False)
-        mesh_header.prop(self, 'should_import_mesh')
-
-        if mesh_panel and self.should_import_mesh:
-            row = mesh_panel.row()
-            col = row.column()
-            col.use_property_split = True
-            col.use_property_decorate = False
-            col.prop(self, 'should_import_materials', text='Materials')
-            col.prop(self, 'should_import_vertex_normals', text='Vertex Normals')
-            col.prop(self, 'should_import_extra_uvs', text='Extra UVs')
-            col.prop(self, 'should_import_vertex_colors', text='Vertex Colors')
-            if self.should_import_vertex_colors:
-                col.prop(self, 'vertex_color_space')
-            col.prop(self, 'should_import_shape_keys', text='Shape Keys')
-
-        skeleton_header, skeleton_panel = layout.panel('skeleton_panel_id', default_closed=False)
-        skeleton_header.prop(self, 'should_import_skeleton')
-
-        if skeleton_panel and self.should_import_skeleton:
-            row = skeleton_panel.row()
-            col = row.column()
-            col.use_property_split = True
-            col.use_property_decorate = False
-            col.prop(self, 'bone_length')
+        assert self.layout
+        psk_import_draw(self.layout, self)
 
 
-classes = (
+class PSK_OT_import_drag_and_drop(Operator, PskImportMixin):
+    bl_idname = 'psk.import_drag_and_drop'
+    bl_label = 'Import PSK'
+    bl_options = {'INTERNAL', 'UNDO', 'PRESET'}
+    bl_description = 'Import PSK files by dragging and dropping them onto the 3D view'
+
+    directory: StringProperty(subtype='FILE_PATH', options={'SKIP_SAVE', 'HIDDEN'})
+    files: CollectionProperty(type=OperatorFileListElement, options={'SKIP_SAVE', 'HIDDEN'})
+
+    @classmethod
+    def poll(cls, context) -> bool:
+        return context.area is not None and context.area.type == 'VIEW_3D'
+
+    def draw(self, context):
+        assert self.layout
+        psk_import_draw(self.layout, self)
+
+    def invoke(self, context, event):
+        assert context.window_manager
+        context.window_manager.invoke_props_dialog(self)
+        return {'RUNNING_MODAL'}
+
+    def execute(self, context):
+        warning_count = 0
+
+        options = get_psk_import_options_from_properties(self)
+
+        for file in self.files:
+            filepath = Path(self.directory) / file.name
+            try:
+                psk = read_psk_from_file(filepath)
+            except OSError as e:
+                self.report({'ERROR'}, f'Failed to read "{filepath}". The file may be corrupted or not a valid PSK file: {e}')
+                return {'CANCELLED'}
+
+            name = os.path.splitext(file.name)[0]
+            result = import_psk(psk, context, name, options)
+            if result.warnings:
+                warning_count += len(result.warnings)
+
+        if warning_count > 0:
+            self.report({'WARNING'}, f'Imported {len(self.files)} PSK file(s) with {warning_count} warning(s)')
+        else:
+            self.report({'INFO'}, f'Imported {len(self.files)} PSK file(s)')
+
+        return {'FINISHED'}
+
+
+# TODO: move to another file
+class PSK_FH_file_handler(FileHandler):
+    bl_idname = 'PSK_FH_import'
+    bl_label = 'Unreal PSK'
+    bl_import_operator = PSK_OT_import_drag_and_drop.bl_idname
+    bl_export_operator = 'psk.export_collection'
+    bl_file_extensions = '.psk;.pskx'
+
+    @classmethod
+    def poll_drop(cls, context: Context) -> bool:
+        return context.area is not None and context.area.type == 'VIEW_3D'
+
+
+_classes = (
     PSK_OT_import,
-    PSK_FH_import,
+    PSK_OT_import_drag_and_drop,
+    PSK_FH_file_handler,
 )
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)

io_scene_psk_psa/psk/importer.py

@@ -1,46 +1,45 @@
-from typing import Optional, List
-
 import bmesh
 import bpy
 import numpy as np
-from bpy.types import VertexGroup
-from mathutils import Quaternion, Vector, Matrix
 
-from .data import Psk
+from bpy.types import Context, Object, VertexGroup, ArmatureModifier, FloatColorAttribute
+from mathutils import Matrix, Quaternion, Vector
+from typing import cast as typing_cast
+
+from psk_psa_py.psk.data import Psk
+from psk_psa_py.shared.data import PsxBone
 from .properties import poly_flags_to_triangle_type_and_bit_flags
-from ..shared.helpers import rgb_to_srgb, is_bdk_addon_loaded
+from ..shared.helpers import is_bdk_addon_loaded, rgb_to_srgb
 
 
 class PskImportOptions:
     def __init__(self):
-        self.name = ''
         self.should_import_mesh = True
         self.should_reuse_materials = True
         self.should_import_vertex_colors = True
         self.vertex_color_space = 'SRGB'
         self.should_import_vertex_normals = True
         self.should_import_extra_uvs = True
-        self.should_import_skeleton = True
+        self.should_import_armature = True
         self.should_import_shape_keys = True
         self.bone_length = 1.0
         self.should_import_materials = True
         self.scale = 1.0
-        self.bdk_repository_id = None
+        self.bdk_repository_id: str | None = None
 
 
 class ImportBone:
-    '''
+    """
     Intermediate bone type for the purpose of construction.
-    '''
-    def __init__(self, index: int, psk_bone: Psk.Bone):
+    """
+    def __init__(self, index: int, psk_bone: PsxBone):
         self.index: int = index
-        self.psk_bone: Psk.Bone = psk_bone
-        self.parent: Optional[ImportBone] = None
+        self.psk_bone: PsxBone = psk_bone
+        self.parent: ImportBone | None = None
         self.local_rotation: Quaternion = Quaternion()
         self.local_translation: Vector = Vector()
         self.world_rotation_matrix: Matrix = Matrix()
         self.world_matrix: Matrix = Matrix()
-        self.vertex_group = None
         self.original_rotation: Quaternion = Quaternion()
         self.original_location: Vector = Vector()
         self.post_rotation: Quaternion = Quaternion()
@@ -48,18 +47,27 @@ class ImportBone:
 
 class PskImportResult:
     def __init__(self):
-        self.warnings: List[str] = []
+        self.warnings: list[str] = []
+        self.armature_object: Object | None = None
+        self.mesh_object: Object | None = None
+
+    @property
+    def root_object(self) -> Object:
+        return self.armature_object if self.armature_object is not None else self.mesh_object
 
 
-def import_psk(psk: Psk, context, options: PskImportOptions) -> PskImportResult:
+def import_psk(psk: Psk, context: Context, name: str, options: PskImportOptions) -> PskImportResult:
     result = PskImportResult()
     armature_object = None
     mesh_object = None
 
-    if options.should_import_skeleton:
-        # ARMATURE
-        armature_data = bpy.data.armatures.new(options.name)
-        armature_object = bpy.data.objects.new(options.name, armature_data)
+    assert context.scene
+    assert bpy.context.view_layer
+
+    if options.should_import_armature:
+        # Armature
+        armature_data = bpy.data.armatures.new(name)
+        armature_object = bpy.data.objects.new(name, armature_data)
         armature_object.show_in_front = True
 
         context.scene.collection.objects.link(armature_object)
@@ -74,7 +82,7 @@ def import_psk(psk: Psk, context, options: PskImportOptions) -> PskImportResult:
 
         bpy.ops.object.mode_set(mode='EDIT')
 
-        import_bones = []
+        import_bones: list[ImportBone] = []
 
         for bone_index, psk_bone in enumerate(psk.bones):
             import_bone = ImportBone(bone_index, psk_bone)
@@ -98,10 +106,16 @@ def import_psk(psk: Psk, context, options: PskImportOptions) -> PskImportResult:
             bone.world_rotation_matrix = bone.local_rotation.conjugated().to_matrix()
             bone.world_rotation_matrix.rotate(parent.world_rotation_matrix)
 
+        # Create all the bones up-front.
+        # This allows us to set up the parent-child relationships properly even if the parent bone comes after the child bone in the PSK file.
         for import_bone in import_bones:
             bone_name = import_bone.psk_bone.name.decode('utf-8')
             edit_bone = armature_data.edit_bones.new(bone_name)
 
+        for import_bone in import_bones:
+            bone_name = import_bone.psk_bone.name.decode('utf-8')
+            edit_bone = armature_data.edit_bones[bone_name]
+
             if import_bone.parent is not None:
                 edit_bone.parent = armature_data.edit_bones[import_bone.psk_bone.parent_index]
             else:
@@ -114,16 +128,17 @@ def import_psk(psk: Psk, context, options: PskImportOptions) -> PskImportResult:
             edit_bone_matrix.translation = import_bone.world_matrix.translation
             edit_bone.matrix = edit_bone_matrix
 
-    # MESH
+    # Mesh
     if options.should_import_mesh:
-        mesh_data = bpy.data.meshes.new(options.name)
-        mesh_object = bpy.data.objects.new(options.name, mesh_data)
+        mesh_data = bpy.data.meshes.new(name)
+        mesh_object = bpy.data.objects.new(name, mesh_data)
 
-        # MATERIALS
+        # Materials
         if options.should_import_materials:
             for material_index, psk_material in enumerate(psk.materials):
                 material_name = psk_material.name.decode('utf-8')
                 material = None
+
                 if options.should_reuse_materials and material_name in bpy.data.materials:
                     # Material already exists, just re-use it.
                     material = bpy.data.materials[material_name]
@@ -131,30 +146,35 @@ def import_psk(psk: Psk, context, options: PskImportOptions) -> PskImportResult:
                     # Material does not yet exist, and we have the BDK addon installed.
                     # Attempt to load it using BDK addon's operator.
                     material_reference = psk.material_references[material_index]
-                    if material_reference and bpy.ops.bdk.link_material(reference=material_reference, repository_id=options.bdk_repository_id) == {'FINISHED'}:
+                    repository_id = options.bdk_repository_id if options.bdk_repository_id is not None else ''
+                    if material_reference and bpy.ops.bdk.link_material(reference=material_reference, repository_id=repository_id) == {'FINISHED'}:
                         material = bpy.data.materials[material_name]
-                else:
-                    # Just create a blank material.
+                
+                if material is None:
+                    # Material was unable to be loaded, so just create a blank material.
                     material = bpy.data.materials.new(material_name)
                     mesh_triangle_type, mesh_triangle_bit_flags = poly_flags_to_triangle_type_and_bit_flags(psk_material.poly_flags)
                     material.psk.mesh_triangle_type = mesh_triangle_type
                     material.psk.mesh_triangle_bit_flags = mesh_triangle_bit_flags
-                    material.use_nodes = True
+                
                 mesh_data.materials.append(material)
 
         bm = bmesh.new()
 
-        # VERTICES
+        # Vertices
         for point in psk.points:
             bm.verts.new(tuple(point))
 
         bm.verts.ensure_lookup_table()
 
-        # FACES
+        # Faces
         invalid_face_indices = set()
         for face_index, face in enumerate(psk.faces):
-            point_indices = map(lambda i: psk.wedges[i].point_index, reversed(face.wedge_indices))
-            points = [bm.verts[i] for i in point_indices]
+            points = (
+                bm.verts[psk.wedges[face.wedge_indices[2]].point_index],
+                bm.verts[psk.wedges[face.wedge_indices[1]].point_index],
+                bm.verts[psk.wedges[face.wedge_indices[0]].point_index],
+            )
             try:
                 bm_face = bm.faces.new(points)
                 bm_face.material_index = face.material_index
@@ -168,47 +188,47 @@ def import_psk(psk: Psk, context, options: PskImportOptions) -> PskImportResult:
         if len(invalid_face_indices) > 0:
             result.warnings.append(f'Discarded {len(invalid_face_indices)} invalid face(s).')
 
+        face_count = len(bm.faces)
+
         bm.to_mesh(mesh_data)
 
-        # TEXTURE COORDINATES
+        # Texture Coordinates
         uv_layer_data_index = 0
-        uv_layer = mesh_data.uv_layers.new(name='UVMap')
+        uv_layer_data = np.zeros((face_count * 3, 2), dtype=np.float32)
         for face_index, face in enumerate(psk.faces):
             if face_index in invalid_face_indices:
                 continue
-            face_wedges = [psk.wedges[i] for i in reversed(face.wedge_indices)]
-            for wedge in face_wedges:
-                uv_layer.data[uv_layer_data_index].uv = wedge.u, 1.0 - wedge.v
+            for wedge in map(lambda i: psk.wedges[i], reversed(face.wedge_indices)):
+                uv_layer_data[uv_layer_data_index] = wedge.u, 1.0 - wedge.v
                 uv_layer_data_index += 1
+        uv_layer = mesh_data.uv_layers.new(name='UVMap')
+        uv_layer.uv.foreach_set('vector', uv_layer_data.ravel())
 
-        # EXTRA UVS
+        # Extra UVs
         if psk.has_extra_uvs and options.should_import_extra_uvs:
-            extra_uv_channel_count = int(len(psk.extra_uvs) / len(psk.wedges))
-            wedge_index_offset = 0
-            for extra_uv_index in range(extra_uv_channel_count):
+            for extra_uv_index, extra_uvs in enumerate(psk.extra_uvs):
+                uv_layer_data = np.zeros((face_count * 3, 2), dtype=np.float32)
                 uv_layer_data_index = 0
-                uv_layer = mesh_data.uv_layers.new(name=f'EXTRAUV{extra_uv_index}')
                 for face_index, face in enumerate(psk.faces):
                     if face_index in invalid_face_indices:
                         continue
                     for wedge_index in reversed(face.wedge_indices):
-                        u, v = psk.extra_uvs[wedge_index_offset + wedge_index]
-                        uv_layer.data[uv_layer_data_index].uv = u, 1.0 - v
+                        u, v = extra_uvs[wedge_index]
+                        uv_layer_data[uv_layer_data_index] = u, 1.0 - v
                         uv_layer_data_index += 1
-                wedge_index_offset += len(psk.wedges)
+                uv_layer = mesh_data.uv_layers.new(name=f'EXTRAUV{extra_uv_index}')
+                uv_layer.uv.foreach_set('vector', uv_layer_data.ravel())
 
-        # VERTEX COLORS
+        # Vertex Colors
         if psk.has_vertex_colors and options.should_import_vertex_colors:
-            # Convert vertex colors to sRGB if necessary.
             psk_vertex_colors = np.zeros((len(psk.vertex_colors), 4))
             for vertex_color_index in range(len(psk.vertex_colors)):
-                psk_vertex_colors[vertex_color_index,:] = psk.vertex_colors[vertex_color_index].normalized()
-            match options.vertex_color_space:
-                case 'SRGBA':
-                    for i in range(psk_vertex_colors.shape[0]):
-                        psk_vertex_colors[i, :3] = tuple(map(lambda x: rgb_to_srgb(x), psk_vertex_colors[i, :3]))
-                case _:
-                    pass
+                psk_vertex_colors[vertex_color_index] = tuple(psk.vertex_colors[vertex_color_index])
+            psk_vertex_colors /= 255.0
+
+            # Convert vertex colors to sRGB if necessary.
+            if options.vertex_color_space == 'SRGBA':
+                psk_vertex_colors[:, :3] = np.vectorize(rgb_to_srgb)(psk_vertex_colors[:, :3])
 
             # Map the PSK vertex colors to the face corners.
             face_count = len(psk.faces) - len(invalid_face_indices)
@@ -223,9 +243,10 @@ def import_psk(psk: Psk, context, options: PskImportOptions) -> PskImportResult:
 
             # Create the vertex color attribute.
             face_corner_color_attribute = mesh_data.attributes.new(name='VERTEXCOLOR', type='FLOAT_COLOR', domain='CORNER')
-            face_corner_color_attribute.data.foreach_set('color', face_corner_colors.flatten())
+            face_corner_color_attribute = typing_cast(FloatColorAttribute, face_corner_color_attribute)
+            face_corner_color_attribute.data.foreach_set('color', face_corner_colors.ravel())
 
-        # VERTEX NORMALS
+        # Vertex Normals
         if psk.has_vertex_normals and options.should_import_vertex_normals:
             mesh_data.polygons.foreach_set('use_smooth', [True] * len(mesh_data.polygons))
             normals = []
@@ -238,17 +259,17 @@ def import_psk(psk: Psk, context, options: PskImportOptions) -> PskImportResult:
         bm.normal_update()
         bm.free()
 
-        # WEIGHTS
+        # Weights
         # Get a list of all bones that have weights associated with them.
         vertex_group_bone_indices = set(map(lambda weight: weight.bone_index, psk.weights))
-        vertex_groups: List[Optional[VertexGroup]] = [None] * len(psk.bones)
+        vertex_groups: list[VertexGroup | None] = [None] * len(psk.bones)
         for bone_index, psk_bone in map(lambda x: (x, psk.bones[x]), vertex_group_bone_indices):
             vertex_groups[bone_index] = mesh_object.vertex_groups.new(name=psk_bone.name.decode('windows-1252'))
 
         for weight in psk.weights:
             vertex_groups[weight.bone_index].add((weight.point_index,), weight.weight, 'ADD')
 
-        # MORPHS (SHAPE KEYS)
+        # Morphs (Shape Keys)
         if options.should_import_shape_keys:
             morph_data_iterator = iter(psk.morph_data)
 
@@ -257,6 +278,7 @@ def import_psk(psk: Psk, context, options: PskImportOptions) -> PskImportResult:
 
             for morph_info in psk.morph_infos:
                 shape_key = mesh_object.shape_key_add(name=morph_info.name.decode('windows-1252'), from_mix=False)
+                shape_key.value = 0.0
 
                 for _ in range(morph_info.vertex_count):
                     morph_data = next(morph_data_iterator)
@@ -266,12 +288,14 @@ def import_psk(psk: Psk, context, options: PskImportOptions) -> PskImportResult:
         context.scene.collection.objects.link(mesh_object)
 
         # Add armature modifier to our mesh object.
-        if options.should_import_skeleton:
+        if options.should_import_armature:
             armature_modifier = mesh_object.modifiers.new(name='Armature', type='ARMATURE')
+            armature_modifier = typing_cast(ArmatureModifier, armature_modifier)
             armature_modifier.object = armature_object
             mesh_object.parent = armature_object
 
-    root_object = armature_object if options.should_import_skeleton else mesh_object
+    root_object = armature_object if options.should_import_armature else mesh_object
+    assert root_object
     root_object.scale = (options.scale, options.scale, options.scale)
 
     try:
@@ -279,4 +303,7 @@ def import_psk(psk: Psk, context, options: PskImportOptions) -> PskImportResult:
     except:
         pass
 
+    result.armature_object = armature_object
+    result.mesh_object = mesh_object
+
     return result

io_scene_psk_psa/psk/properties.py

@@ -1,4 +1,6 @@
-from bpy.props import EnumProperty
+import sys
+
+from bpy.props import BoolProperty, EnumProperty, FloatProperty, StringProperty
 from bpy.types import PropertyGroup
 
 mesh_triangle_types_items = (
@@ -18,9 +20,15 @@ mesh_triangle_bit_flags_items = (
 )
 
 class PSX_PG_material(PropertyGroup):
-    mesh_triangle_type: EnumProperty(items=mesh_triangle_types_items, name='Triangle Type')
-    mesh_triangle_bit_flags: EnumProperty(items=mesh_triangle_bit_flags_items, name='Triangle Bit Flags',
-                                          options={'ENUM_FLAG'})
+    mesh_triangle_type: EnumProperty(
+        name='Triangle Type',
+        items=mesh_triangle_types_items
+        )
+    mesh_triangle_bit_flags: EnumProperty(
+        name='Triangle Bit Flags',
+        items=mesh_triangle_bit_flags_items,
+        options={'ENUM_FLAG'}
+        )
 
 mesh_triangle_types_items_dict = {item[0]: item[3] for item in mesh_triangle_types_items}
 mesh_triangle_bit_flags_items_dict = {item[0]: item[3] for item in mesh_triangle_bit_flags_items}
@@ -34,7 +42,7 @@ def triangle_type_and_bit_flags_to_poly_flags(mesh_triangle_type: str, mesh_tria
     return poly_flags
 
 
-def poly_flags_to_triangle_type_and_bit_flags(poly_flags: int) -> (str, set[str]):
+def poly_flags_to_triangle_type_and_bit_flags(poly_flags: int) -> tuple[str, set[str]]:
     try:
         triangle_type = next(item[0] for item in mesh_triangle_types_items if item[3] == (poly_flags & 15))
     except StopIteration:
@@ -43,6 +51,104 @@ def poly_flags_to_triangle_type_and_bit_flags(poly_flags: int) -> (str, set[str]
     return triangle_type, triangle_bit_flags
 
 
-classes = (
+def should_import_mesh_get(self):
+    return self.components in {'ALL', 'MESH'}
+
+
+def should_import_skleton_get(self):
+    return self.components in {'ALL', 'ARMATURE'}
+
+
+vertex_color_space_items = (
+    ('LINEAR', 'Linear', ''),
+    ('SRGBA', 'sRGBA', ''),
+)
+
+psk_import_components_items = (
+    ('ALL', 'Mesh & Armature', 'Import mesh and armature'),
+    ('MESH', 'Mesh Only', 'Import mesh only'),
+    ('ARMATURE', 'Armature Only', 'Import armature only'),
+)
+
+class PskImportMixin:
+    should_import_vertex_colors: BoolProperty(
+        default=True,
+        options=set(),
+        name='Import Vertex Colors',
+        description='Import vertex colors, if available'
+    )
+    vertex_color_space: EnumProperty(
+        name='Vertex Color Space',
+        options=set(),
+        description='The source vertex color space',
+        default='SRGBA',
+        items=vertex_color_space_items
+    )
+    should_import_vertex_normals: BoolProperty(
+        default=True,
+        name='Import Vertex Normals',
+        options=set(),
+        description='Import vertex normals, if available.\n\nThis is only supported for PSKX files'
+    )
+    should_import_extra_uvs: BoolProperty(
+        default=True,
+        name='Import Extra UVs',
+        options=set(),
+        description='Import extra UV maps, if available'
+    )
+    components: EnumProperty(
+        name='Components',
+        options=set(),
+        description='Which components to import',
+        items=psk_import_components_items,
+        default='ALL'
+    )
+    should_import_mesh: BoolProperty(
+        name='Import Mesh',
+        get=should_import_mesh_get,
+    )
+    should_import_materials: BoolProperty(
+        default=True,
+        name='Import Materials',
+        options=set(),
+    )
+    should_import_armature: BoolProperty(
+        name='Import Skeleton',
+        get=should_import_skleton_get,
+    )
+    bone_length: FloatProperty(
+        default=1.0,
+        min=sys.float_info.epsilon,
+        step=100,
+        soft_min=1.0,
+        name='Bone Length',
+        options=set(),
+        subtype='DISTANCE',
+        description='Length of the bones'
+    )
+    should_import_shape_keys: BoolProperty(
+        default=True,
+        name='Import Shape Keys',
+        options=set(),
+        description='Import shape keys, if available.\n\nThis is only supported for PSKX files'
+    )
+    scale: FloatProperty(
+        name='Scale',
+        default=1.0,
+        soft_min=0.0,
+    )
+    bdk_repository_id: StringProperty(
+        name='BDK Repository ID',
+        default='',
+        options=set(),
+        description='The ID of the BDK repository to use for loading materials'
+    )
+
+
+_classes = (
     PSX_PG_material,
 )
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)
+

io_scene_psk_psa/psk/properties.pyi

@@ -0,0 +1,23 @@
+class PSX_PG_material:
+    mesh_triangle_type: str
+    mesh_triangle_bit_flags: set[str]
+
+
+class PskImportMixin:
+    should_import_vertex_colors: bool
+    vertex_color_space: str
+    should_import_vertex_normals: bool
+    should_import_extra_uvs: bool
+    components: str
+    should_import_mesh: bool
+    should_import_materials: bool
+    should_import_armature: bool
+    bone_length: float
+    should_import_shape_keys: bool
+    scale: float
+    bdk_repository_id: str
+
+
+def triangle_type_and_bit_flags_to_poly_flags(mesh_triangle_type: str, mesh_triangle_bit_flags: set[str]) -> int: ...
+
+def poly_flags_to_triangle_type_and_bit_flags(poly_flags: int) -> tuple[str, set[str]]: ...

io_scene_psk_psa/psk/reader.py

@@ -1,93 +0,0 @@
-import ctypes
-import os
-import re
-import warnings
-from pathlib import Path
-
-from .data import *
-
-
-def _read_types(fp, data_class, section: Section, data):
-    buffer_length = section.data_size * section.data_count
-    buffer = fp.read(buffer_length)
-    offset = 0
-    for _ in range(section.data_count):
-        data.append(data_class.from_buffer_copy(buffer, offset))
-        offset += section.data_size
-
-
-def _read_material_references(path: str) -> List[str]:
-    property_file_path = Path(path).with_suffix('.props.txt')
-    if not property_file_path.is_file():
-        # Property file does not exist.
-        return []
-    # Do a crude regex match to find the Material list entries.
-    contents = property_file_path.read_text()
-    pattern = r'Material\s*=\s*([^\s^,]+)'
-    return re.findall(pattern, contents)
-
-
-def read_psk(path: str) -> Psk:
-
-    psk = Psk()
-
-    # Read the PSK file sections.
-    with open(path, 'rb') as fp:
-        while fp.read(1):
-            fp.seek(-1, 1)
-            section = Section.from_buffer_copy(fp.read(ctypes.sizeof(Section)))
-            if section.name == b'ACTRHEAD':
-                pass
-            elif section.name == b'PNTS0000':
-                _read_types(fp, Vector3, section, psk.points)
-            elif section.name == b'VTXW0000':
-                if section.data_size == ctypes.sizeof(Psk.Wedge16):
-                    _read_types(fp, Psk.Wedge16, section, psk.wedges)
-                elif section.data_size == ctypes.sizeof(Psk.Wedge32):
-                    _read_types(fp, Psk.Wedge32, section, psk.wedges)
-                else:
-                    raise RuntimeError('Unrecognized wedge format')
-            elif section.name == b'FACE0000':
-                _read_types(fp, Psk.Face, section, psk.faces)
-            elif section.name == b'MATT0000':
-                _read_types(fp, Psk.Material, section, psk.materials)
-            elif section.name == b'REFSKELT':
-                _read_types(fp, Psk.Bone, section, psk.bones)
-            elif section.name == b'RAWWEIGHTS':
-                _read_types(fp, Psk.Weight, section, psk.weights)
-            elif section.name == b'FACE3200':
-                _read_types(fp, Psk.Face32, section, psk.faces)
-            elif section.name == b'VERTEXCOLOR':
-                _read_types(fp, Color, section, psk.vertex_colors)
-            elif section.name.startswith(b'EXTRAUVS'):
-                _read_types(fp, Vector2, section, psk.extra_uvs)
-            elif section.name == b'VTXNORMS':
-                _read_types(fp, Vector3, section, psk.vertex_normals)
-            elif section.name == b'MRPHINFO':
-                _read_types(fp, Psk.MorphInfo, section, psk.morph_infos)
-            elif section.name == b'MRPHDATA':
-                _read_types(fp, Psk.MorphData, section, psk.morph_data)
-            else:
-                # Section is not handled, skip it.
-                fp.seek(section.data_size * section.data_count, os.SEEK_CUR)
-                warnings.warn(f'Unrecognized section "{section.name} at position {fp.tell():15}"')
-
-    '''
-    UEViewer exports a sidecar file (*.props.txt) with fully-qualified reference paths for each material
-    (e.g., Texture'Package.Group.Object').
-    '''
-    psk.material_references = _read_material_references(path)
-
-    '''
-    Tools like UEViewer and CUE4Parse write the point index as a 32-bit integer, exploiting the fact that due to struct
-    alignment, there were 16-bits of padding following the original 16-bit point index in the wedge struct.
-    However, this breaks compatibility with PSK files that were created with older tools that treated the
-    point index as a 16-bit integer and might have junk data written to the padding bits.
-    To work around this, we check if each point is still addressable using a 16-bit index, and if it is, assume the
-    point index is a 16-bit integer and truncate the high bits.
-    '''
-    if len(psk.points) <= 65536:
-        for wedge in psk.wedges:
-            wedge.point_index &= 0xFFFF
-
-    return psk

io_scene_psk_psa/psk/ui.py

@@ -15,6 +15,7 @@ class PSK_PT_material(Panel):
 
     def draw(self, context):
         layout = self.layout
+        assert layout is not None
         layout.use_property_split = True
         layout.use_property_decorate = False
         material = context.material
@@ -23,6 +24,10 @@ class PSK_PT_material(Panel):
         col.prop(material.psk, 'mesh_triangle_bit_flags', expand=True, text='Flags')
 
 
-classes = (
+_classes = (
     PSK_PT_material,
 )
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)
+

io_scene_psk_psa/psk/writer.py

@@ -1,58 +0,0 @@
-import os
-from ctypes import Structure, sizeof
-from typing import Type
-
-from .data import Psk
-from ..shared.data import Section, Vector3
-
-MAX_WEDGE_COUNT = 65536
-MAX_POINT_COUNT = 4294967296
-MAX_BONE_COUNT = 2147483647
-MAX_MATERIAL_COUNT = 256
-
-
-def _write_section(fp, name: bytes, data_type: Type[Structure] = None, data: list = None):
-    section = Section()
-    section.name = name
-    if data_type is not None and data is not None:
-        section.data_size = sizeof(data_type)
-        section.data_count = len(data)
-    fp.write(section)
-    if data is not None:
-        for datum in data:
-            fp.write(datum)
-
-
-def write_psk(psk: Psk, path: str):
-    if len(psk.wedges) > MAX_WEDGE_COUNT:
-        raise RuntimeError(f'Number of wedges ({len(psk.wedges)}) exceeds limit of {MAX_WEDGE_COUNT}')
-    if len(psk.points) > MAX_POINT_COUNT:
-        raise RuntimeError(f'Numbers of vertices ({len(psk.points)}) exceeds limit of {MAX_POINT_COUNT}')
-    if len(psk.materials) > MAX_MATERIAL_COUNT:
-        raise RuntimeError(f'Number of materials ({len(psk.materials)}) exceeds limit of {MAX_MATERIAL_COUNT}')
-    if len(psk.bones) > MAX_BONE_COUNT:
-        raise RuntimeError(f'Number of bones ({len(psk.bones)}) exceeds limit of {MAX_BONE_COUNT}')
-    elif len(psk.bones) == 0:
-        raise RuntimeError(f'At least one bone must be marked for export')
-
-    # Make the directory for the file if it doesn't exist.
-    os.makedirs(os.path.dirname(path), exist_ok=True)
-
-    with open(path, 'wb') as fp:
-        _write_section(fp, b'ACTRHEAD')
-        _write_section(fp, b'PNTS0000', Vector3, psk.points)
-
-        wedges = []
-        for index, w in enumerate(psk.wedges):
-            wedge = Psk.Wedge16()
-            wedge.material_index = w.material_index
-            wedge.u = w.u
-            wedge.v = w.v
-            wedge.point_index = w.point_index
-            wedges.append(wedge)
-
-        _write_section(fp, b'VTXW0000', Psk.Wedge16, wedges)
-        _write_section(fp, b'FACE0000', Psk.Face, psk.faces)
-        _write_section(fp, b'MATT0000', Psk.Material, psk.materials)
-        _write_section(fp, b'REFSKELT', Psk.Bone, psk.bones)
-        _write_section(fp, b'RAWWEIGHTS', Psk.Weight, psk.weights)

io_scene_psk_psa/shared/data.py

@@ -1,95 +0,0 @@
-from ctypes import *
-from typing import Tuple
-
-
-class Color(Structure):
-    _fields_ = [
-        ('r', c_ubyte),
-        ('g', c_ubyte),
-        ('b', c_ubyte),
-        ('a', c_ubyte),
-    ]
-
-    def __iter__(self):
-        yield self.r
-        yield self.g
-        yield self.b
-        yield self.a
-
-    def __eq__(self, other):
-        return all(map(lambda x: x[0] == x[1], zip(self, other)))
-
-    def __repr__(self):
-        return repr(tuple(self))
-
-    def normalized(self) -> Tuple:
-        return tuple(map(lambda x: x / 255.0, iter(self)))
-
-
-class Vector2(Structure):
-    _fields_ = [
-        ('x', c_float),
-        ('y', c_float),
-    ]
-
-    def __iter__(self):
-        yield self.x
-        yield self.y
-
-    def __repr__(self):
-        return repr(tuple(self))
-
-
-class Vector3(Structure):
-    _fields_ = [
-        ('x', c_float),
-        ('y', c_float),
-        ('z', c_float),
-    ]
-
-    def __iter__(self):
-        yield self.x
-        yield self.y
-        yield self.z
-
-    def __repr__(self):
-        return repr(tuple(self))
-
-    @classmethod
-    def zero(cls):
-        return Vector3(0, 0, 0)
-
-
-class Quaternion(Structure):
-    _fields_ = [
-        ('x', c_float),
-        ('y', c_float),
-        ('z', c_float),
-        ('w', c_float),
-    ]
-
-    def __iter__(self):
-        yield self.w
-        yield self.x
-        yield self.y
-        yield self.z
-
-    def __repr__(self):
-        return repr(tuple(self))
-
-    @classmethod
-    def identity(cls):
-        return Quaternion(0, 0, 0, 1)
-
-
-class Section(Structure):
-    _fields_ = [
-        ('name', c_char * 20),
-        ('type_flags', c_int32),
-        ('data_size', c_int32),
-        ('data_count', c_int32)
-    ]
-
-    def __init__(self, *args, **kw):
-        super().__init__(*args, **kw)
-        self.type_flags = 1999801

io_scene_psk_psa/shared/dfs.py

@@ -0,0 +1,148 @@
+"""
+Depth-first object iterator functions for Blender collections and view layers.
+
+These functions are used to iterate over objects in a collection or view layer in a depth-first manner, including
+instances. This is useful for exporters that need to traverse the object hierarchy in a predictable order.
+"""
+
+from typing import Iterable
+
+from bpy.types import Collection, Object, ViewLayer, LayerCollection
+from mathutils import Matrix
+
+
+class DfsObject:
+    """
+    Represents an object in a depth-first search.
+    """
+    def __init__(self, obj: Object, instance_objects: list[Object], matrix_world: Matrix):
+        self.obj = obj
+        self.instance_objects = instance_objects
+        self.matrix_world = matrix_world
+
+    @property
+    def is_visible(self) -> bool:
+        """
+        Check if the object is visible.
+
+        @return: True if the object is visible, False otherwise.
+        """
+        if self.instance_objects:
+            return self.instance_objects[-1].visible_get()
+        return self.obj.visible_get()
+
+    @property
+    def is_selected(self) -> bool:
+        """
+        Check if the object is selected.
+        @return: True if the object is selected, False otherwise.
+        """
+        if self.instance_objects:
+            return self.instance_objects[-1].select_get()
+        return self.obj.select_get()
+
+
+def _dfs_object_children(obj: Object, collection: Collection) -> Iterable[Object]:
+    """
+    Construct a list of objects in hierarchy order from `collection.objects`, only keeping those that are in the
+    collection.
+
+    @param obj: The object to start the search from.
+    @param collection:  The collection to search in.
+    @return: An iterable of objects in hierarchy order.
+    """
+    yield obj
+    for child in obj.children:
+        if child.name in collection.objects:
+            yield from _dfs_object_children(child, collection)
+
+
+def dfs_objects_in_collection(collection: Collection) -> Iterable[Object]:
+    """
+    Returns a depth-first iterator over all objects in a collection, only keeping those that are directly in the
+    collection.
+
+    @param collection: The collection to search in.
+    @return: An iterable of objects in hierarchy order.
+    """
+    objects_hierarchy = []
+    for obj in collection.objects:
+        if obj.parent is None or obj.parent not in set(collection.objects):
+            objects_hierarchy.append(obj)
+    for obj in objects_hierarchy:
+        yield from _dfs_object_children(obj, collection)
+
+
+def dfs_collection_objects(collection: Collection, visible_only: bool = False) -> Iterable[DfsObject]:
+    """
+    Depth-first search of objects in a collection, including recursing into instances.
+
+    @param collection: The collection to search in.
+    @return: An iterable of tuples containing the object, the instance objects, and the world matrix.
+    """
+    yield from _dfs_collection_objects_recursive(collection)
+
+
+def _dfs_collection_objects_recursive(
+        collection: Collection,
+        instance_objects: list[Object] | None = None,
+        matrix_world: Matrix = Matrix.Identity(4),
+        visited: set[Object] | None = None
+) -> Iterable[DfsObject]:
+    """
+    Depth-first search of objects in a collection, including recursing into instances.
+    This is a recursive function.
+
+    @param collection: The collection to search in.
+    @param instance_objects: The running hierarchy of instance objects.
+    @param matrix_world: The world matrix of the current object.
+    @param visited: A set of visited object-instance pairs.
+    @return: An iterable of tuples containing the object, the instance objects, and the world matrix.
+    """
+
+    # We want to also yield the top-level instance object so that callers can inspect the selection status etc.
+    if visited is None:
+        visited = set()
+
+    if instance_objects is None:
+        instance_objects = list()
+
+    # First, yield all objects in child collections.
+    for child in collection.children:
+        yield from _dfs_collection_objects_recursive(child, instance_objects, matrix_world.copy(), visited)
+
+    # Then, evaluate all objects in this collection.
+    for obj in dfs_objects_in_collection(collection):
+        visited_pair = (obj, instance_objects[-1] if instance_objects else None)
+        if visited_pair in visited:
+            continue
+        # If this an instance, we need to recurse into it.
+        if obj.instance_collection is not None:
+            # Calculate the instance transform.
+            instance_offset_matrix = Matrix.Translation(-obj.instance_collection.instance_offset)
+            # Recurse into the instance collection.
+            yield from _dfs_collection_objects_recursive(obj.instance_collection,
+                                                         instance_objects + [obj],
+                                                         matrix_world @ (obj.matrix_world @ instance_offset_matrix),
+                                                         visited)
+        else:
+            # Object is not an instance, yield it.
+            yield DfsObject(obj, instance_objects, matrix_world @ obj.matrix_world)
+            visited.add(visited_pair)
+
+
+def dfs_view_layer_objects(view_layer: ViewLayer) -> Iterable[DfsObject]:
+    """
+    Depth-first iterator over all objects in a view layer, including recursing into instances.
+
+    @param view_layer: The view layer to inspect.
+    @return: An iterable of tuples containing the object, the instance objects, and the world matrix.
+    """
+    visited = set()
+    def layer_collection_objects_recursive(layer_collection: LayerCollection):
+        for child in layer_collection.children:
+            yield from layer_collection_objects_recursive(child)
+        # Iterate only the top-level objects in this collection first.
+        yield from _dfs_collection_objects_recursive(layer_collection.collection, visited=visited)
+
+    yield from layer_collection_objects_recursive(view_layer.layer_collection)

io_scene_psk_psa/shared/helpers.py

@@ -1,22 +1,20 @@
-import re
-import typing
-from typing import List, Iterable
+import bpy
+from collections import Counter
+from typing import Iterable, cast as typing_cast
+from bpy.types import Armature, AnimData, Collection, Context, Object, ArmatureModifier, SpaceProperties, PropertyGroup, Material
+from mathutils import Matrix, Vector, Quaternion as BpyQuaternion
+from psk_psa_py.shared.data import PsxBone, Quaternion, Vector3
 
-import bpy.types
-from bpy.types import NlaStrip, Object, AnimData
+from ..shared.types import BpyCollectionProperty, PSX_PG_bone_collection_list_item
 
 
-def rgb_to_srgb(c: float):
+def rgb_to_srgb(c: float) -> float:
     if c > 0.0031308:
         return 1.055 * (pow(c, (1.0 / 2.4))) - 0.055
-    else:
-        return 12.92 * c
+    return 12.92 * c
 
 
-def get_nla_strips_in_frame_range(animation_data: AnimData, frame_min: float, frame_max: float) -> List[NlaStrip]:
-    if animation_data is None:
-        return []
-    strips = []
+def get_nla_strips_in_frame_range(animation_data: AnimData, frame_min: float, frame_max: float):
     for nla_track in animation_data.nla_tracks:
         if nla_track.mute:
             continue
@@ -24,21 +22,35 @@ def get_nla_strips_in_frame_range(animation_data: AnimData, frame_min: float, fr
             if (strip.frame_start < frame_min and strip.frame_end > frame_max) or \
                     (frame_min <= strip.frame_start < frame_max) or \
                     (frame_min < strip.frame_end <= frame_max):
-                strips.append(strip)
-    return strips
+                yield strip
 
 
-def populate_bone_collection_list(armature_object: Object, bone_collection_list: bpy.props.CollectionProperty) -> None:
+def populate_bone_collection_list(
+        bone_collection_list: BpyCollectionProperty[PSX_PG_bone_collection_list_item], 
+        armature_objects: Iterable[Object],
+        primary_key: str = 'OBJECT'
+        ):
     """
-    Updates the bone collections collection.
+    Updates the bone collection list.
 
-    Bone collection selections are preserved between updates unless none of the groups were previously selected;
-    otherwise, all collections are selected by default.
+    Selection is preserved between updates unless none of the groups were previously selected.
+    Otherwise, all collections are selected by default.
+
+    The primary key is used to determine how to group the armature objects. For example, if the primary key is
+    'DATA', then all bone collections with the same armature data-block will be under one entry.
+
+    :param bone_collection_list: The list to update.
+    :param armature_objects: The armature objects to populate the collection with.
+    :param primary_key: The primary key to use for the collection (one of 'OBJECT' or 'DATA').
+    :return: None
     """
     has_selected_collections = any([g.is_selected for g in bone_collection_list])
     unassigned_collection_is_selected, selected_assigned_collection_names = True, []
 
-    if armature_object is None:
+    if primary_key not in ('OBJECT', 'DATA'):
+        assert False, f'Invalid primary key: {primary_key}'
+
+    if not armature_objects:
         return
 
     if has_selected_collections:
@@ -51,59 +63,67 @@ def populate_bone_collection_list(armature_object: Object, bone_collection_list:
         selected_assigned_collection_names = [
             g.name for i, g in enumerate(bone_collection_list) if i != unassigned_collection_idx and g.is_selected]
 
+
     bone_collection_list.clear()
 
-    armature = armature_object.data
+    unique_armature_data = set()
 
-    if armature is None:
-        return
+    for armature_object in armature_objects:
+        armature_data = typing_cast(Armature, armature_object.data)
 
-    item = bone_collection_list.add()
-    item.name = 'Unassigned'
-    item.index = -1
-    # Count the number of bones without an assigned bone collection
-    item.count = sum(map(lambda bone: 1 if len(bone.collections) == 0 else 0, armature.bones))
-    item.is_selected = unassigned_collection_is_selected
+        if armature_data is None:
+            continue
 
-    for bone_collection_index, bone_collection in enumerate(armature.collections):
-        item = bone_collection_list.add()
-        item.name = bone_collection.name
-        item.index = bone_collection_index
-        item.count = len(bone_collection.bones)
-        item.is_selected = bone_collection.name in selected_assigned_collection_names if has_selected_collections else True
+        if primary_key == 'DATA':
+            if armature_data in unique_armature_data:
+                # Skip this armature since we have already added an entry for it and we are using the data as the key.
+                continue
+            unique_armature_data.add(armature_data)
+        
+        unassigned_bone_count = sum(map(lambda bone: 1 if len(bone.collections) == 0 else 0, armature_data.bones))
+
+        if unassigned_bone_count > 0:
+            item = bone_collection_list.add()
+            item.armature_object_name = armature_object.name
+            item.armature_data_name = armature_data.name if armature_data else ''
+            item.name = 'Unassigned'
+            item.index = -1
+            # Count the number of bones without an assigned bone collection
+            item.count = unassigned_bone_count
+            item.is_selected = unassigned_collection_is_selected
+
+        for bone_collection_index, bone_collection in enumerate(armature_data.collections_all):
+            item = bone_collection_list.add()
+            item.armature_object_name = armature_object.name
+            item.armature_data_name = armature_data.name if armature_data else ''
+            item.name = bone_collection.name
+            item.index = bone_collection_index
+            item.count = len(bone_collection.bones)
+            item.is_selected = bone_collection.name in selected_assigned_collection_names if has_selected_collections else True
 
 
-def check_bone_names(bone_names: Iterable[str]):
-    pattern = re.compile(r'^[a-zA-Z\d_\- ]+$')
-    invalid_bone_names = [x for x in bone_names if pattern.match(x) is None]
-    if len(invalid_bone_names) > 0:
-        raise RuntimeError(f'The following bone names are invalid: {invalid_bone_names}.\n'
-                           f'Bone names must only contain letters, numbers, spaces, hyphens and underscores.\n'
-                           f'You can bypass this by disabling "Enforce Bone Name Restrictions" in the export settings.')
-
-
-def get_export_bone_names(armature_object: Object, bone_filter_mode: str, bone_collection_indices: List[int]) -> List[str]:
+def get_export_bone_names(armature_object: Object, bone_filter_mode: str, bone_collection_indices: Iterable[int]) -> list[str]:
     """
     Returns a sorted list of bone indices that should be exported for the given bone filter mode and bone collections.
 
     Note that the ancestors of bones within the bone collections will also be present in the returned list.
 
-    :param armature_object: Blender object with type 'ARMATURE'
-    :param bone_filter_mode: One of ['ALL', 'BONE_COLLECTIONS']
-    :param bone_collection_indices: List of bone collection indices to be exported.
+    :param armature_object: Blender object with type `'ARMATURE'`
+    :param bone_filter_mode: One of `['ALL', 'BONE_COLLECTIONS']`
+    :param bone_collection_indices: A list of bone collection indices to export.
     :return: A sorted list of bone indices that should be exported.
     """
     if armature_object is None or armature_object.type != 'ARMATURE':
         raise ValueError('An armature object must be supplied')
 
-    armature_data = typing.cast(bpy.types.Armature, armature_object.data)
+    armature_data = typing_cast(Armature, armature_object.data)
     bones = armature_data.bones
     bone_names = [x.name for x in bones]
 
     # Get a list of the bone indices that we are explicitly including.
     bone_index_stack = []
     is_exporting_unassigned_bone_collections = -1 in bone_collection_indices
-    bone_collections = list(armature_data.collections)
+    bone_collections = list(armature_data.collections_all)
 
     for bone_index, bone in enumerate(bones):
         # Check if this bone is in any of the collections in the bone collection indices list.
@@ -135,35 +155,556 @@ def get_export_bone_names(armature_object: Object, bone_filter_mode: str, bone_c
     # We use the bone names for the return values because the bone name is a more universal way of referencing them.
     # For example, users of this function may modify bone lists, which would invalidate the indices and require an
     # index mapping scheme to resolve it. Using strings is more comfy and results in less code downstream.
-    instigator_bone_names = [bones[x[1]].name if x[1] is not None else None for x in bone_indices]
     bone_names = [bones[x[0]].name for x in bone_indices]
 
-    # Ensure that the hierarchy we are sending back has a single root bone.
-    bone_indices = [x[0] for x in bone_indices]
-    root_bones = [bones[bone_index] for bone_index in bone_indices if bones[bone_index].parent is None]
-    if len(root_bones) > 1:
-        # There is more than one root bone.
-        # Print out why each root bone was included by linking it to one of the explicitly included bones.
-        root_bone_names = [bone.name for bone in root_bones]
-        for root_bone_name in root_bone_names:
-            bone_name = root_bone_name
-            while True:
-                # Traverse the instigator chain until the end to find the true instigator bone.
-                # TODO: in future, it would be preferential to have a readout of *all* instigator bones.
-                instigator_bone_name = instigator_bone_names[bone_names.index(bone_name)]
-                if instigator_bone_name is None:
-                    print(f'Root bone "{root_bone_name}" was included because {bone_name} was marked for export')
-                    break
-                bone_name = instigator_bone_name
-
-        raise RuntimeError('Exported bone hierarchy must have a single root bone.\n'
-                           f'The bone hierarchy marked for export has {len(root_bones)} root bones: {root_bone_names}.\n'
-                           f'Additional debugging information has been written to the console.')
-
     return bone_names
 
 
-def is_bdk_addon_loaded():
-    # TODO: this does not work anymore for *reasons*. Just check if bpy.ops.bdk.link_material exists.
-    # return addon_utils.check('bdk_addon')[1]
-    return bpy.ops.bdk.link_material is not None
+def is_bdk_addon_loaded() -> bool:
+    return 'bdk' in dir(bpy.ops)
+
+
+def convert_string_to_cp1252_bytes(string: str) -> bytes:
+    try:
+        return bytes(string, encoding='windows-1252')
+    except UnicodeEncodeError as e:
+        raise RuntimeError(f'The string "{string}" contains characters that cannot be encoded in the Windows-1252 codepage') from e
+
+
+def create_psx_bones_from_blender_bones(
+        bones: list[bpy.types.Bone],
+        armature_object_matrix_world: Matrix,
+) -> list[PsxBone]:
+    """
+    Creates PSX bones from the given Blender bones.
+    
+    The bones are in world space based on the armature object's world matrix.
+    """
+    # Apply the scale of the armature object to the bone location.
+    _, _, armature_object_scale = armature_object_matrix_world.decompose()
+
+    psx_bones: list[PsxBone] = []
+    for bone in bones:
+        psx_bone = PsxBone()
+        psx_bone.name = convert_string_to_cp1252_bytes(bone.name)
+
+        if bone.parent is not None:
+            try:
+                parent_index = bones.index(bone.parent)
+                psx_bone.parent_index = parent_index
+                psx_bones[parent_index].children_count += 1
+            except ValueError:
+                pass
+
+        if bone.parent is not None:
+            # Child bone.
+            rotation = bone.matrix.to_quaternion().conjugated()
+            inverse_parent_rotation = bone.parent.matrix.to_quaternion().inverted()
+            parent_head = inverse_parent_rotation @ bone.parent.head
+            parent_tail = inverse_parent_rotation @ bone.parent.tail
+            location = (parent_tail - parent_head) + bone.head
+        else:
+            location = armature_object_matrix_world @ bone.head
+            bone_rotation = bone.matrix.to_quaternion().conjugated()
+            rotation = bone_rotation @ armature_object_matrix_world.to_3x3().to_quaternion()
+            rotation.conjugate()
+
+        location.x *= armature_object_scale.x
+        location.y *= armature_object_scale.y
+        location.z *= armature_object_scale.z
+
+        # Copy the calculated location and rotation to the bone.
+        psx_bone.location = convert_vector_to_vector3(location)
+        psx_bone.rotation = convert_bpy_quaternion_to_psx_quaternion(rotation)
+
+        psx_bones.append(psx_bone)
+
+    return psx_bones
+
+
+class PsxBoneResult:
+    def __init__(self, psx_bone: PsxBone, armature_object: Object | None) -> None:
+        self.psx_bone: PsxBone = psx_bone
+        self.armature_object: Object | None = armature_object
+
+
+class PsxBoneCreateResult:
+    def __init__(self,
+                 bones: list[PsxBoneResult],  # List of tuples of (psx_bone, armature_object)
+                 armature_object_root_bone_indices: dict[Object, int],
+                 armature_object_bone_names: dict[Object, list[str]],
+                 ):
+        self.bones = bones
+        self.armature_object_root_bone_indices = armature_object_root_bone_indices
+        self.armature_object_bone_names = armature_object_bone_names
+
+
+def convert_vector_to_vector3(vector: Vector) -> Vector3:
+    """
+    Convert a Blender mathutils.Vector to a psk_psa_py Vector3.
+    """
+    vector3 = Vector3()
+    vector3.x = vector.x
+    vector3.y = vector.y
+    vector3.z = vector.z
+    return vector3
+
+
+def convert_bpy_quaternion_to_psx_quaternion(quaternion: BpyQuaternion) -> Quaternion:
+    """
+    Convert a Blender mathutils.Quaternion to a psk_psa_py Quaternion.
+    """
+    psx_quaternion = Quaternion()
+    psx_quaternion.x = quaternion.x
+    psx_quaternion.y = quaternion.y
+    psx_quaternion.z = quaternion.z
+    psx_quaternion.w = quaternion.w
+    return psx_quaternion
+
+
+class PsxBoneCollection:
+    """
+    Stores the armature's object name, data-block name and bone collection index.
+    """
+    def __init__(self, armature_object_name: str, armature_data_name: str, index: int):
+        self.armature_object_name = armature_object_name
+        self.armature_data_name = armature_data_name
+        self.index = index
+
+
+class ObjectNode:
+    def __init__(self, obj: Object):
+        self.object = obj
+        self.parent: ObjectNode | None = None
+        self.children: list[ObjectNode] = []
+    
+    @property
+    def root(self):
+        """
+        Gets the root in the object hierarchy. This can return itself if this node has no parent.
+        """
+        n = self
+        while n.parent is not None:
+            n = n.parent
+        return n
+
+
+class ObjectTree:
+    '''
+    A tree of the armature objects based on their hierarchy.
+    '''
+    def __init__(self, objects: Iterable[Object]):
+        self.root_nodes: list[ObjectNode] = []
+        object_node_map: dict[Object, ObjectNode] = {x: ObjectNode(x) for x in objects}
+        
+        for obj, object_node in object_node_map.items():
+            if obj.parent in object_node_map:
+                parent_node = object_node_map[obj.parent]
+                object_node.parent = parent_node
+                parent_node.children.append(object_node)
+            else:
+                self.root_nodes.append(object_node)
+
+    def __iter__(self):
+        """
+        An depth-first iterator over the armature tree.
+        """
+        node_stack = [] + self.root_nodes
+        while node_stack:
+            node = node_stack.pop()
+            yield node
+            node_stack = node.children + node_stack
+    
+    def objects_iterator(self):
+        for node in self:
+            yield node.object
+    
+    def dump(self):
+        # Print out the hierarchy of armature objects for debugging using the root nodes, with indentation to show parent-child relationships.
+        for root_node in self.root_nodes:
+            def print_object_node(node: ObjectNode, indent: int = 0):
+                print(' ' * indent + f'- {node.object.name}')
+                for child_node in node.children:
+                    print_object_node(child_node, indent + 2)
+            print_object_node(root_node)
+
+
+def create_psx_bones(
+        armature_objects: list[Object],
+        export_space: str = 'WORLD',
+        forward_axis: str = 'X',
+        up_axis: str = 'Z',
+        scale: float = 1.0,
+        bone_filter_mode: str = 'ALL',
+        bone_collection_indices: list[PsxBoneCollection] | None = None,
+        bone_collection_primary_key: str = 'OBJECT',
+) -> PsxBoneCreateResult:
+    """
+    Creates a list of PSX bones from the given armature objects and options.
+    This function will throw a RuntimeError if multiple armature objects are passed in and the export space is not WORLD.
+    It will also throw a RuntimeError if the bone names are not unique when compared case-insensitively.
+    """
+    if bone_collection_indices is None:
+        bone_collection_indices = []
+
+    armature_tree = ObjectTree(armature_objects)
+
+    if len(armature_tree.root_nodes) >= 2:
+        root_bone_names = []
+        for root_node in armature_tree.root_nodes:
+            root_bone_names.append(root_node.object.name)
+        raise RuntimeError(
+            f'Multiple root armature objects were found: {root_bone_names}.\n'
+            'Only one root armature object is allowed.\n'
+            'To use multiple armature objects, parent them to one another in a hierarchy using Bone parenting.'
+        )
+
+    # TODO: confirm this to be working with non-bone parented armature hierarchies.
+
+    total_bone_count = 0
+    for armature_object in filter(lambda x: x.data is not None, armature_objects):
+        armature_data = typing_cast(Armature, armature_object.data)
+        total_bone_count += len(armature_data.bones)
+
+    # Store the bone names to be exported for each armature object.
+    armature_object_bone_names: dict[Object, list[str]] = dict()
+    for armature_object in  armature_objects:
+        armature_bone_collection_indices: list[int] = []
+        match bone_collection_primary_key:
+            case 'OBJECT':
+                armature_bone_collection_indices.extend([x.index for x in bone_collection_indices if x.armature_object_name == armature_object.name])
+            case 'DATA':
+                armature_bone_collection_indices.extend([x.index for x in bone_collection_indices if armature_object.data and x.armature_data_name == armature_object.data.name])
+            case _:
+                assert False, f'Invalid primary key: {bone_collection_primary_key}'
+        bone_names = get_export_bone_names(armature_object, bone_filter_mode, armature_bone_collection_indices)
+        armature_object_bone_names[armature_object] = bone_names
+
+    # Store the index of the root bone for each armature object.
+    # We will need this later to correctly assign vertex weights.
+    armature_object_root_bone_indices: dict[Object | None, int] = dict()
+    bones: list[PsxBoneResult] = []
+
+    # Iterate through all the armature objects.
+    for armature_object in armature_objects:
+        bone_names = armature_object_bone_names[armature_object]
+        armature_data = typing_cast(Armature, armature_object.data)
+        armature_bones = [armature_data.bones[bone_name] for bone_name in bone_names]
+
+        # Ensure that we don't have multiple root bones in this armature.
+        root_bone_count = sum(1 for bone in armature_bones if bone.parent is None)
+        if root_bone_count > 1:
+            raise RuntimeError(f'Armature object \'{armature_object.name}\' has multiple root bones. '
+                               f'Only one root bone is allowed per armature.'
+                               )
+
+        armature_psx_bones = create_psx_bones_from_blender_bones(
+            bones=armature_bones,
+            armature_object_matrix_world=armature_object.matrix_world,
+        )
+
+        if len(armature_psx_bones) == 0:
+            continue
+
+        # We have the bones in world space. If we are attaching this armature to a parent bone, we need to convert
+        # the root bone to be relative to the target parent bone.
+        if armature_object.parent in armature_objects:
+            match armature_object.parent_type:
+                case 'BONE':
+                    # Parent to a bone in the parent armature object.
+                    # We just need to get the world-space location of each of the bones and get the relative pose, then
+                    # assign that location and rotation to the root bone.
+                    parent_bone_name = armature_object.parent_bone
+
+                    if parent_bone_name == '':
+                        raise RuntimeError(f'Armature object \'{armature_object.name}\' is parented to a bone but no parent bone name is specified.')
+
+                    parent_armature_data = typing_cast(Armature, armature_object.parent.data)
+                    if parent_armature_data is None:
+                        raise RuntimeError(f'Parent object \'{armature_object.parent.name}\' is not an armature.')
+                    try:
+                        parent_bone = parent_armature_data.bones[parent_bone_name]
+                    except KeyError:
+                        raise RuntimeError(f'Bone \'{parent_bone_name}\' could not be found in armature \'{armature_object.parent.name}\'.')    
+                    
+                    parent_bone_world_matrix = armature_object.parent.matrix_world @ parent_bone.matrix_local.to_4x4()
+                    parent_bone_world_location, parent_bone_world_rotation, _ = parent_bone_world_matrix.decompose()
+
+                    # Convert the root bone location to be relative to the parent bone.
+                    root_bone = armature_psx_bones[0]
+                    root_bone_location = Vector((root_bone.location.x, root_bone.location.y, root_bone.location.z))
+                    relative_location = parent_bone_world_rotation.inverted() @ (root_bone_location - parent_bone_world_location)
+                    root_bone.location = convert_vector_to_vector3(relative_location)
+                    # Convert the root bone rotation to be relative to the parent bone.
+                    root_bone_rotation = BpyQuaternion((root_bone.rotation.w, root_bone.rotation.x, root_bone.rotation.y, root_bone.rotation.z))
+                    relative_rotation = parent_bone_world_rotation.inverted() @ root_bone_rotation
+                    root_bone.rotation = convert_bpy_quaternion_to_psx_quaternion(relative_rotation)
+                case _:
+                    raise RuntimeError(f'Unhandled parent type ({armature_object.parent_type}) for object {armature_object.name}.\n'
+                                        f'Parent type must be \'Bone\'.'
+                                        )
+
+        # If we are appending these bones to an existing list of bones, we need to adjust the parent indices for
+        # all the non-root bones.
+        if len(bones) > 0:
+            parent_index_offset = len(bones)
+            for bone in armature_psx_bones[1:]:
+                bone.parent_index += parent_index_offset
+
+        armature_object_root_bone_indices[armature_object] = len(bones)
+
+        bones.extend(PsxBoneResult(psx_bone, armature_object) for psx_bone in armature_psx_bones)
+
+    # Check that we have any bones to export at this point. If not, we can skip the rest of the processing.
+    if len(bones) == 0:
+        return PsxBoneCreateResult(
+            bones=[],
+            armature_object_root_bone_indices=armature_object_root_bone_indices,
+            armature_object_bone_names=armature_object_bone_names,
+        )
+
+    # Check if any of the armatures are parented to one another.
+    # If so, adjust the hierarchy as though they are part of the same armature object.
+    # This will let us re-use rig components without destructively joining them.
+    for armature_object in armature_objects:
+        if armature_object.parent not in armature_objects:
+            continue
+
+        # This armature object is parented to another armature object that we are exporting.
+        # First fetch the root bone indices for the two armature objects.
+        root_bone_index = armature_object_root_bone_indices.get(armature_object, None)
+        parent_root_bone_index = armature_object_root_bone_indices.get(armature_object.parent, None)
+
+        if root_bone_index is None or parent_root_bone_index is None:
+            raise RuntimeError(f'Could not find root bone index for armature object \'{armature_object.name}\' or its parent \'{armature_object.parent.name}\'.\n'
+                               'This likely means that one of the armatures does not have any bones that are being exported, which is not allowed when using armature parenting between multiple armatures.'
+                               )
+
+        match armature_object.parent_type:
+            case 'OBJECT':
+                # Parent this armature's root bone to the root bone of the parent object.
+                bones[root_bone_index].psx_bone.parent_index = parent_root_bone_index
+            case 'BONE':
+                # Parent this armature's root bone to the specified bone in the parent.
+                new_parent_index = None
+                for bone_index, bone in enumerate(bones):
+                    if bone.psx_bone.name == convert_string_to_cp1252_bytes(armature_object.parent_bone) and bone.armature_object == armature_object.parent:
+                        new_parent_index = bone_index
+                        break
+                if new_parent_index == None:
+                    raise RuntimeError(f'Bone \'{armature_object.parent_bone}\' could not be found in armature \'{armature_object.parent.name}\'.')
+                bones[root_bone_index].psx_bone.parent_index = new_parent_index
+            case _:
+                raise RuntimeError(f'Unhandled parent type ({armature_object.parent_type}) for object {armature_object.name}.\n'
+                                    f'Parent type must be \'Object\' or \'Bone\'.'
+                                    )
+
+    match export_space:
+        case 'WORLD':
+            # No action needed, bones are already in world space.
+            pass
+        case 'ARMATURE':
+            # The bone is in world-space. We need to convert it to armature (object) space.
+            # Get this from matrix_local.
+            root_bone, root_bone_armature_object = bones[0].psx_bone, bones[0].armature_object
+            if root_bone_armature_object is None:
+                raise RuntimeError('Cannot export to Armature space when multiple armatures are being exported.')
+        
+            armature_data = typing_cast(Armature, root_bone_armature_object.data)
+            matrix_local = armature_data.bones[root_bone.name.decode('windows-1252')].matrix_local
+            location, rotation, _ = matrix_local.decompose()
+            root_bone.location = convert_vector_to_vector3(location)
+            root_bone.rotation = convert_bpy_quaternion_to_psx_quaternion(rotation)
+        case 'ROOT':
+            # Zero out the root bone transforms.
+            root_bone = bones[0].psx_bone
+            root_bone.location = Vector3.zero()
+            root_bone.rotation = Quaternion.identity()
+        case _:
+            assert False, f'Invalid export space: {export_space}'
+
+    # Check if there are bone name conflicts between armatures.
+    bone_name_counts = Counter(bone.psx_bone.name.decode('windows-1252').upper() for bone in bones)
+    for bone_name, count in bone_name_counts.items():
+        if count > 1:
+            raise RuntimeError(
+                f'Found {count} bones with the name "{bone_name}". '
+                f'Bone names must be unique when compared case-insensitively.'
+            )
+    
+    # Apply the scale to the bone locations.
+    for bone in bones:
+        bone.psx_bone.location.x *= scale
+        bone.psx_bone.location.y *= scale
+        bone.psx_bone.location.z *= scale
+    
+    coordinate_system_matrix = get_coordinate_system_transform(forward_axis, up_axis)
+    coordinate_system_default_rotation = coordinate_system_matrix.to_quaternion()
+
+    # Apply the coordinate system transform to the root bone.
+    root_psx_bone = bones[0].psx_bone
+    # Get transform matrix from root bone location and rotation.
+    root_bone_location = Vector((root_psx_bone.location.x, root_psx_bone.location.y, root_psx_bone.location.z))
+    root_bone_rotation = BpyQuaternion((root_psx_bone.rotation.w, root_psx_bone.rotation.x, root_psx_bone.rotation.y, root_psx_bone.rotation.z))
+    root_bone_matrix = (
+        Matrix.Translation(root_bone_location) @
+        root_bone_rotation.to_matrix().to_4x4()
+    )
+    root_bone_matrix = coordinate_system_default_rotation.inverted().to_matrix().to_4x4() @ root_bone_matrix
+    location, rotation, _ = root_bone_matrix.decompose()
+    root_psx_bone.location = convert_vector_to_vector3(location)
+    root_psx_bone.rotation = convert_bpy_quaternion_to_psx_quaternion(rotation)
+
+    convert_bpy_quaternion_to_psx_quaternion(coordinate_system_default_rotation)
+
+    return PsxBoneCreateResult(
+        bones=bones,
+        armature_object_root_bone_indices=armature_object_root_bone_indices,
+        armature_object_bone_names=armature_object_bone_names,
+    )
+
+
+def get_vector_from_axis_identifier(axis_identifier: str) -> Vector:
+    match axis_identifier:
+        case 'X':
+            return Vector((1.0, 0.0, 0.0))
+        case 'Y':
+            return Vector((0.0, 1.0, 0.0))
+        case 'Z':
+            return Vector((0.0, 0.0, 1.0))
+        case '-X':
+            return Vector((-1.0, 0.0, 0.0))
+        case '-Y':
+            return Vector((0.0, -1.0, 0.0))
+        case '-Z':
+            return Vector((0.0, 0.0, -1.0))
+        case _:
+            assert False, f'Invalid axis identifier: {axis_identifier}'
+
+
+def get_coordinate_system_transform(forward_axis: str = 'X', up_axis: str = 'Z') -> Matrix:
+    forward = get_vector_from_axis_identifier(forward_axis)
+    up = get_vector_from_axis_identifier(up_axis)
+    left = up.cross(forward)
+    return Matrix((
+        (forward.x, forward.y, forward.z, 0.0),
+        (left.x, left.y, left.z, 0.0),
+        (up.x, up.y, up.z, 0.0),
+        (0.0, 0.0, 0.0, 1.0)
+    ))
+
+
+def get_armatures_for_mesh_objects(mesh_objects: Iterable[Object]):
+    """
+    Returns a generator of unique armature objects that are used by the given mesh objects.
+    """
+    armature_objects: set[Object] = set()
+    for mesh_object in mesh_objects:
+        armature_modifiers = [typing_cast(ArmatureModifier, x) for x in mesh_object.modifiers if x.type == 'ARMATURE']
+        for armature_object in map(lambda x: x.object, armature_modifiers):
+            if armature_object is not None:
+                armature_objects.add(armature_object)
+    yield from armature_objects
+
+
+def get_collection_from_context(context: Context) -> Collection | None:
+    if context.space_data is None or context.space_data.type != 'PROPERTIES':
+        return None
+    space_data = typing_cast(SpaceProperties, context.space_data)
+    if space_data.use_pin_id:
+        return typing_cast(Collection, space_data.pin_id)
+    else:
+        return context.collection
+
+
+def get_collection_export_operator_from_context(context: Context) -> PropertyGroup | None:
+    collection = get_collection_from_context(context)
+    if collection is None or collection.active_exporter_index is None:
+        return None
+    if 0 > collection.active_exporter_index >= len(collection.exporters):
+        return None
+    exporter = collection.exporters[collection.active_exporter_index]
+    return exporter.export_properties
+
+
+from ..shared.dfs import DfsObject, dfs_collection_objects, dfs_view_layer_objects
+from typing import Set
+from bpy.types import Depsgraph
+
+
+class PskInputObjects(object):
+    def __init__(self):
+        self.mesh_dfs_objects: list[DfsObject] = []
+        self.armature_objects: list[Object] = []
+
+
+def get_materials_for_mesh_objects(depsgraph: Depsgraph, mesh_objects: Iterable[Object]):
+    '''
+    Yields unique materials used by the given mesh objects.
+    If any mesh has no material slots or any empty material slots, None is yielded at the end.
+    '''
+    yielded_materials: Set[Material] = set()
+    has_none_material = False
+    for mesh_object in mesh_objects:
+        evaluated_mesh_object = mesh_object.evaluated_get(depsgraph)
+        # Check if mesh has no material slots or any empty material slots
+        if len(evaluated_mesh_object.material_slots) == 0:
+            has_none_material = True
+        else:
+            for material_slot in evaluated_mesh_object.material_slots:
+                material = material_slot.material
+                if material is None:
+                    has_none_material = True
+                else:
+                    if material not in yielded_materials:
+                        yielded_materials.add(material)
+                        yield material
+    # Yield None at the end if any mesh had no material slots or empty material slots
+    if has_none_material:
+        yield None
+
+
+def get_mesh_objects_for_collection(collection: Collection) -> Iterable[DfsObject]:
+    return filter(lambda x: x.obj.type == 'MESH', dfs_collection_objects(collection))
+
+
+def get_mesh_objects_for_context(context: Context) -> Iterable[DfsObject]:
+    if context.view_layer is None:
+        return
+    for dfs_object in dfs_view_layer_objects(context.view_layer):
+        if dfs_object.obj.type == 'MESH' and dfs_object.is_selected:
+            yield dfs_object
+
+
+def get_armature_for_mesh_object(mesh_object: Object) -> Object | None:
+    if mesh_object.type != 'MESH':
+        return None
+    # Get the first armature modifier with a non-empty armature object.
+    for modifier in filter(lambda x: x.type == 'ARMATURE', mesh_object.modifiers):
+            armature_modifier = typing_cast(ArmatureModifier, modifier)
+            if armature_modifier.object is not None:
+                return armature_modifier.object
+    return None
+
+
+def _get_psk_input_objects(mesh_dfs_objects: Iterable[DfsObject]) -> PskInputObjects:
+    mesh_dfs_objects = list(mesh_dfs_objects)
+    if len(mesh_dfs_objects) == 0:
+        raise RuntimeError('No mesh objects were found to export.')
+    input_objects = PskInputObjects()
+    input_objects.mesh_dfs_objects = mesh_dfs_objects
+    # Get the armature objects used on all the meshes being exported.
+    armature_objects = get_armatures_for_mesh_objects(map(lambda x: x.obj, mesh_dfs_objects))
+    # Sort them in hierarchy order.
+    input_objects.armature_objects = list(ObjectTree(armature_objects).objects_iterator())
+    return input_objects
+
+
+def get_psk_input_objects_for_context(context: Context) -> PskInputObjects:
+    mesh_objects = list(get_mesh_objects_for_context(context))
+    return _get_psk_input_objects(mesh_objects)
+
+
+def get_psk_input_objects_for_collection(collection: Collection) -> PskInputObjects:
+    mesh_objects = get_mesh_objects_for_collection(collection)
+    return _get_psk_input_objects(mesh_objects)

io_scene_psk_psa/shared/operators.py

@@ -0,0 +1,72 @@
+from bpy.types import Operator
+from bpy.props import BoolProperty
+
+from .types import PsxBoneExportMixin
+from typing import cast as typing_cast
+
+from .helpers import get_collection_export_operator_from_context, get_psk_input_objects_for_collection, populate_bone_collection_list
+
+
+
+class PSK_OT_bone_collection_list_populate(Operator):
+    bl_idname = 'psk.bone_collection_list_populate'
+    bl_label = 'Populate Bone Collection List'
+    bl_description = 'Populate the bone collection list from the armature that will be used in this collection export'
+    bl_options = {'INTERNAL'}
+
+    def execute(self, context):
+        export_operator = get_collection_export_operator_from_context(context)
+        if export_operator is None:
+            self.report({'ERROR_INVALID_CONTEXT'}, 'No valid export operator found in context')
+            return {'CANCELLED'}
+        if context.collection is None:
+            self.report({'ERROR_INVALID_CONTEXT'}, 'No active collection')
+            return {'CANCELLED'}
+        try:
+            input_objects = get_psk_input_objects_for_collection(context.collection)
+        except RuntimeError as e:
+            self.report({'ERROR_INVALID_CONTEXT'}, str(e))
+            return {'CANCELLED'}
+        if not input_objects.armature_objects:
+            self.report({'ERROR_INVALID_CONTEXT'}, 'No armature modifiers found on mesh objects')
+            return {'CANCELLED'}
+        export_operator = typing_cast(PsxBoneExportMixin, export_operator)
+
+        # Save and restore the selected status of the bones collections.
+        selected_status: dict[int, bool] = dict()
+        for bone_collection in export_operator.bone_collection_list:
+            selected_status[hash(bone_collection)] = bone_collection.is_selected
+
+        populate_bone_collection_list(export_operator.bone_collection_list, input_objects.armature_objects)
+
+        for bone_collection in export_operator.bone_collection_list:
+            bone_collection.is_selected = selected_status.get(hash(bone_collection), False)
+
+        return {'FINISHED'}
+
+
+class PSK_OT_bone_collection_list_select_all(Operator):
+    bl_idname = 'psk.bone_collection_list_select_all'
+    bl_label = 'Select All'
+    bl_description = 'Select all bone collections'
+    bl_options = {'INTERNAL'}
+
+    is_selected: BoolProperty(default=True)
+
+    def execute(self, context):
+        export_operator = get_collection_export_operator_from_context(context)
+        if export_operator is None:
+            self.report({'ERROR_INVALID_CONTEXT'}, 'No valid export operator found in context')
+            return {'CANCELLED'}
+        export_operator = typing_cast(PsxBoneExportMixin, export_operator)
+        for item in export_operator.bone_collection_list:
+            item.is_selected = self.is_selected
+        return {'FINISHED'}
+
+
+_classes = (
+    PSK_OT_bone_collection_list_populate,
+    PSK_OT_bone_collection_list_select_all,
+)
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)

io_scene_psk_psa/shared/types.py

@@ -1,24 +1,55 @@
-from bpy.props import StringProperty, IntProperty, BoolProperty, FloatProperty
+from typing import Generic, Iterable, Sized, TypeVar
+import bpy
+from bpy.props import CollectionProperty, EnumProperty, StringProperty, IntProperty, BoolProperty, FloatProperty
 from bpy.types import PropertyGroup, UIList, UILayout, Context, AnyType, Panel
 
+T = TypeVar('T')
+
+# Don't actually use this, this is just for typing.
+class BpyCollectionProperty(Generic[T], Iterable[T], Sized):
+    def add(self) -> T:
+        return T() # type: ignore
+
+    def clear(self) -> None:
+        pass
+
+    def move(self, src_index: int, dst_index: int):
+        pass
+
+    def remove(self, index: int):
+        pass
+
 
 class PSX_UL_bone_collection_list(UIList):
 
     def draw_item(self, context: Context, layout: UILayout, data: AnyType, item: AnyType, icon: int,
                   active_data: AnyType, active_property: str, index: int = 0, flt_flag: int = 0):
         row = layout.row()
+
         row.prop(item, 'is_selected', text=getattr(item, 'name'))
         row.label(text=str(getattr(item, 'count')), icon='BONE_DATA')
 
+        armature_object = bpy.data.objects.get(item.armature_object_name, None)
+        if armature_object is None:
+            row.label(icon='ERROR')
+        else:
+            row.label(text=armature_object.name, icon='ARMATURE_DATA')
+
 
 class PSX_PG_bone_collection_list_item(PropertyGroup):
+    armature_object_name: StringProperty()
+    armature_data_name: StringProperty()
     name: StringProperty()
     index: IntProperty()
     count: IntProperty()
     is_selected: BoolProperty(default=False)
 
+    def __hash__(self) -> int:
+        return hash(f'{self.name}/{self.armature_object_name}/{self.armature_data_name}')
+
 
 class PSX_PG_action_export(PropertyGroup):
+    group: StringProperty(name='Group', description='The group of the sequence', maxlen=64)
     compression_ratio: FloatProperty(name='Compression Ratio', default=1.0, min=0.0, max=1.0, subtype='FACTOR', description='The key sampling ratio of the exported sequence.\n\nA compression ratio of 1.0 will export all frames, while a compression ratio of 0.5 will export half of the frames')
     key_quota: IntProperty(name='Key Quota', default=0, min=1, description='The minimum number of frames to be exported')
     fps: FloatProperty(name='FPS', default=30.0, min=0.0, description='The frame rate of the exported sequence')
@@ -34,22 +65,133 @@ class PSX_PT_action(Panel):
 
     @classmethod
     def poll(cls, context: 'Context'):
-        return context.active_object and context.active_object.type == 'ARMATURE' and context.active_action is not None
+        return context.active_object is not None and context.active_object.type == 'ARMATURE' and context.active_action is not None
 
     def draw(self, context: 'Context'):
         action = context.active_action
         layout = self.layout
+        assert layout is not None
         flow = layout.grid_flow(columns=1)
         flow.use_property_split = True
         flow.use_property_decorate = False
-        flow.prop(action.psa_export, 'compression_ratio')
-        flow.prop(action.psa_export, 'key_quota')
-        flow.prop(action.psa_export, 'fps')
+        psa_export = getattr(action, 'psa_export')
+        assert psa_export
+        flow.prop(psa_export, 'compression_ratio')
+        flow.prop(psa_export, 'key_quota')
+        flow.prop(psa_export, 'fps')
+        flow.prop(psa_export, 'group', placeholder='Group')
 
 
-classes = (
+bone_filter_mode_items = (
+    ('ALL', 'All', 'All bones will be exported'),
+    ('BONE_COLLECTIONS', 'Bone Collections', 'Only bones belonging to the selected bone collections and their ancestors will be exported')
+)
+
+axis_identifiers = ('X', 'Y', 'Z', '-X', '-Y', '-Z')
+forward_items = (
+    ('X', 'X Forward', ''),
+    ('Y', 'Y Forward', ''),
+    ('Z', 'Z Forward', ''),
+    ('-X', '-X Forward', ''),
+    ('-Y', '-Y Forward', ''),
+    ('-Z', '-Z Forward', ''),
+)
+
+up_items = (
+    ('X', 'X Up', ''),
+    ('Y', 'Y Up', ''),
+    ('Z', 'Z Up', ''),
+    ('-X', '-X Up', ''),
+    ('-Y', '-Y Up', ''),
+    ('-Z', '-Z Up', ''),
+)
+
+
+def forward_axis_update(self, context):
+    if self.forward_axis == self.up_axis:
+        # Automatically set the up axis to the next available axis
+        self.up_axis = next((axis for axis in axis_identifiers if axis != self.forward_axis), 'Z')
+
+
+def up_axis_update(self, context):
+    if self.up_axis == self.forward_axis:
+        # Automatically set the forward axis to the next available axis
+        self.forward_axis = next((axis for axis in axis_identifiers if axis != self.up_axis), 'X')
+
+
+class AxisMixin:
+    forward_axis: EnumProperty(
+        name='Forward',
+        items=forward_items,
+        default='X',
+        update=forward_axis_update
+    )
+    up_axis: EnumProperty(
+        name='Up',
+        items=up_items,
+        default='Z',
+        update=up_axis_update
+    )
+
+
+class TransformMixin(AxisMixin):
+    scale: FloatProperty(
+        name='Scale',
+        default=1.0,
+        description='Scale factor to apply to all location data',
+        soft_min=0.0,
+        soft_max=100.0
+    )
+
+
+export_space_items = [
+    ('WORLD', 'World', 'Export in world space'),
+    ('ARMATURE', 'Armature', 'Export the local space of the armature object'),
+    ('ROOT', 'Root', 'Export in the space of the root bone')
+]
+
+
+class ExportSpaceMixin:
+    export_space: EnumProperty(
+        name='Export Space',
+        items=export_space_items,
+        default='WORLD'
+    )
+ 
+transform_source_items = (
+    ('SCENE', 'Scene', 'Use the scene transform settings'),
+    ('CUSTOM', 'Custom', 'Use custom transform settings'),
+)
+
+class TransformSourceMixin:
+    transform_source: EnumProperty(
+        items=transform_source_items,
+        name='Transform Source',
+        default='SCENE'
+    )
+ 
+class PsxBoneExportMixin:
+    bone_filter_mode: EnumProperty(
+        name='Bone Filter',
+        options=set(),
+        description='',
+        items=bone_filter_mode_items,
+    )
+    bone_collection_list: CollectionProperty(type=PSX_PG_bone_collection_list_item)
+    bone_collection_list_index: IntProperty(default=0, name='', description='')
+
+
+class PSX_PG_scene_export(PropertyGroup, TransformMixin):
+    pass
+
+
+_classes = (
+    PSX_PG_scene_export,
     PSX_PG_action_export,
     PSX_PG_bone_collection_list_item,
     PSX_UL_bone_collection_list,
     PSX_PT_action,
 )
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)

io_scene_psk_psa/shared/types.pyi

@@ -0,0 +1,62 @@
+from typing import Generic, TypeVar, Iterable, Sized
+
+T = TypeVar("T")
+
+# https://docs.blender.org/api/current/bpy.types.bpy_prop_collection_idprop.html#bpy.types.bpy_prop_collection_idprop
+class BpyCollectionProperty(Generic[T], Iterable[T], Sized):
+    def add(self) -> T:
+        pass
+
+    def clear(self) -> None:
+        pass
+
+    def move(self, src_index: int, dst_index: int):
+        pass
+
+    def remove(self, index: int):
+        pass
+
+
+class PSX_PG_bone_collection_list_item:
+    armature_object_name: str
+    armature_data_name: str
+    name: str
+    index: int
+    count: int
+    is_selected: bool
+
+
+class PSX_PG_action_export:
+    group: str
+    compression_ratio: float
+    key_quota: int
+    fps: float
+
+
+class AxisMixin:
+    forward_axis: str
+    up_axis: str
+
+
+class TransformMixin(AxisMixin):
+    scale: float
+
+
+class ExportSpaceMixin:
+    export_space: str
+
+
+class TransformSourceMixin:
+    transform_source: str
+
+
+class PsxBoneExportMixin:
+    bone_filter_mode: str
+    bone_collection_list: BpyCollectionProperty[PSX_PG_bone_collection_list_item]
+    bone_collection_list_index: int
+
+
+class PSX_PG_scene_export(TransformSourceMixin):
+    pass
+
+bone_filter_mode_items: tuple[tuple[str, str, str]]

io_scene_psk_psa/shared/ui.py

@@ -0,0 +1,59 @@
+import bpy
+from bpy.types import Context, UILayout, Panel
+
+from .types import bone_filter_mode_items
+
+
+def is_bone_filter_mode_item_available(pg, identifier):
+    if identifier == 'BONE_COLLECTIONS' and len(pg.bone_collection_list) == 0:
+        return False
+    return True
+
+
+def draw_bone_filter_mode(layout: UILayout, pg, should_always_show_bone_collections=False):
+    row = layout.row(align=True)
+    for item_identifier, _, _ in bone_filter_mode_items:
+        identifier = item_identifier
+        item_layout = row.row(align=True)
+        item_layout.prop_enum(pg, 'bone_filter_mode', item_identifier)
+        item_layout.enabled = should_always_show_bone_collections or is_bone_filter_mode_item_available(pg, identifier)
+
+
+class PSX_PT_scene(Panel):
+    bl_idname = 'PSX_PT_scene'
+    bl_label = 'PSK Export'
+    bl_space_type = 'PROPERTIES'
+    bl_region_type = 'WINDOW'
+    bl_context = 'scene'
+    bl_category = 'PSK/PSA'
+
+    @classmethod
+    def poll(cls, context):
+        return context.scene is not None
+    
+    def draw(self, context: Context):
+        layout = self.layout
+        scene = bpy.context.scene
+        psx_export = getattr(scene, 'psx_export', None)
+        if psx_export is None:
+            return
+        
+        # Transform
+        transform_header, transform_panel = layout.panel('Transform', default_closed=False)
+        transform_header.label(text='Transform')
+        if transform_panel:
+            flow = layout.grid_flow(columns=1)
+            flow.use_property_split = True
+            flow.use_property_decorate = False
+            flow.prop(psx_export, 'scale')
+            flow.prop(psx_export, 'forward_axis')
+            flow.prop(psx_export, 'up_axis')
+
+
+_classes = (
+    PSX_PT_scene,
+)
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)
+

pyproject.toml

@@ -0,0 +1,15 @@
+[project]
+name = "io_scene_psk_psa"
+
+[pytest]
+blender-addons-dirs = "io_scene_psk_psa"
+testpaths = "../tests"
+
+[tool.coverage.run]
+branch = true
+
+[tool.coverage.report]
+ignore_errors = true
+
+[tool.pyright]
+reportInvalidTypeForm = false

test.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+
+# Exit immediately if a command exits with a non-zero status
+set -e
+
+# Function to find an available container command (podman or docker)
+find_container_cli() {
+    if command -v podman &> /dev/null; then
+        echo "podman"
+    elif command -v docker &> /dev/null; then
+        echo "docker"
+    else
+        echo ""
+    fi
+}
+
+CONTAINER_CLI=$(find_container_cli)
+
+if [ -z "$CONTAINER_CLI" ]; then
+    echo "Error: Neither Podman nor Docker was found. Please install one of them to proceed."
+    exit 1
+fi
+
+echo "Using container CLI: $CONTAINER_CLI"
+
+# Build the image and capture its ID
+# The '-q' flag is supported by both podman and docker build to suppress output and return only the image ID.
+IMAGE_ID=$($CONTAINER_CLI build -q .)
+
+# Run the container using the selected CLI and captured image ID
+$CONTAINER_CLI run -it \
+    --volume "${PWD}:/io_scene_psk_psa:z" \
+    --volume "${PWD}/io_scene_psk_psa:/addons/io_scene_psk_psa:z" \
+    --volume "${PWD}/tests:/tests:z" \
+    "$IMAGE_ID"

tests/psa_import_test.py

@@ -0,0 +1,65 @@
+import bpy
+import pytest
+
+SHREK_PSK_FILEPATH = 'tests/data/Shrek.psk'
+SHREK_PSA_FILEPATH = 'tests/data/Shrek.psa'
+
+
+@pytest.fixture(autouse=True)
+def run_before_and_after_Tests(tmpdir):
+    # Setup: Run before the tests
+    bpy.ops.wm.read_homefile(app_template='')
+    yield
+    # Teardown: Run after the tests
+    pass
+
+
+def test_psa_import_all():
+    assert bpy.ops.psk.import_file(
+        filepath=SHREK_PSK_FILEPATH,
+        components='ALL',
+        ) == {'FINISHED'}, "PSK import failed."
+
+    armature_object = bpy.data.objects.get('Shrek', None)
+    assert armature_object is not None, "Armature object not found in the scene."
+    assert armature_object.type == 'ARMATURE', "Object is not of type ARMATURE."
+
+    # Select the armature object
+    bpy.context.view_layer.objects.active = armature_object
+    armature_object.select_set(True)
+
+    # Import the associated PSA file with import_all operator.
+    assert bpy.ops.psa.import_all(
+        filepath=SHREK_PSA_FILEPATH
+        ) == {'FINISHED'}, "PSA import failed."
+    
+    # TODO: More thorough tests on the imported data for the animations.
+    EXPECTED_ACTION_COUNT = 135
+    assert len(bpy.data.actions) == EXPECTED_ACTION_COUNT, \
+        f"Expected {EXPECTED_ACTION_COUNT} actions, but found {len(bpy.data.actions)}."
+
+
+def test_psa_import_convert_to_samples():
+    assert bpy.ops.psk.import_file(
+        filepath=SHREK_PSK_FILEPATH,
+        components='ALL',
+        ) == {'FINISHED'}, "PSK import failed."
+
+    armature_object = bpy.data.objects.get('Shrek', None)
+    assert armature_object is not None, "Armature object not found in the scene."
+    assert armature_object.type == 'ARMATURE', "Object is not of type ARMATURE."
+
+    # Select the armature object
+    bpy.context.view_layer.objects.active = armature_object
+    armature_object.select_set(True)
+
+    # Import the associated PSA file with import_all operator, and convert to samples.
+    assert bpy.ops.psa.import_all(
+        filepath=SHREK_PSA_FILEPATH,
+        should_convert_to_samples=True
+        ) == {'FINISHED'}, "PSA import failed."
+    
+    # TODO: More thorough tests on the imported data for the animations.
+    EXPECTED_ACTION_COUNT = 135
+    assert len(bpy.data.actions) == EXPECTED_ACTION_COUNT, \
+        f"Expected {EXPECTED_ACTION_COUNT} actions, but found {len(bpy.data.actions)}."

tests/psk_export_test.py

@@ -0,0 +1,62 @@
+import bpy
+import pytest
+import tempfile
+from psk_psa_py.psk.reader import read_psk_from_file
+
+
+@pytest.fixture(autouse=True)
+def run_before_and_after_tests(tmpdir):
+    # Setup: Run before the tests
+    bpy.ops.wm.read_homefile(filepath='tests/data/psk_export_tests.blend')
+
+    yield
+    # Teardown: Run after the tests
+    pass
+
+
+def export_psk_and_read_back(collection_name: str):
+    collection = bpy.data.collections.get(collection_name, None)
+    assert collection is not None, f"Collection {collection_name} not found in the scene."
+
+    # Select the collection to make it the active collection.
+    view_layer = bpy.context.view_layer
+    assert view_layer is not None, "No active view layer found."
+    view_layer.active_layer_collection = view_layer.layer_collection.children[collection_name]
+
+    filepath = str(tempfile.gettempdir() + f'/{collection_name}.psk')
+
+    collection.exporters[0].filepath = filepath
+
+    assert bpy.ops.collection.exporter_export() == {'FINISHED'}, "PSK export failed."
+
+    # Now load the exported PSK file and return its contents.
+    psk = read_psk_from_file(filepath)
+    return psk
+
+
+def test_psk_export_cube_no_bones():
+    psk = export_psk_and_read_back('cube_no_bones')
+
+    # There should be one bone when no armature is present, this is added automatically to serve as the root bone for the mesh.
+    assert len(psk.bones) == 1, f"Expected 1 bone, but found {len(psk.bones)}."
+    assert len(psk.points) == 8, f"Expected 8 points, but found {len(psk.points)}."
+    assert len(psk.faces) == 12, f"Expected 12 faces, but found {len(psk.faces)}."
+    assert len(psk.materials) == 1, f"Expected 1 material, but found {len(psk.materials)}."
+
+
+def test_cube_edge_split():
+    # The cube has all the edges set to split with a modifier.
+    psk = export_psk_and_read_back('cube_edge_split')
+
+    assert len(psk.bones) == 1, f"Expected 1 bone, but found {len(psk.bones)}."
+    assert len(psk.points) == 24, f"Expected 24 points, but found {len(psk.points)}."
+    assert len(psk.faces) == 12, f"Expected 12 faces, but found {len(psk.faces)}."
+    assert len(psk.materials) == 1, f"Expected 1 material, but found {len(psk.materials)}."
+
+
+def test_cube_with_simple_armature():
+    # The cube has all the edges set to split with a modifier.
+    psk = export_psk_and_read_back('cube_with_simple_armature')
+
+    assert len(psk.bones) == 1, f"Expected 1 bone, but found {len(psk.bones)}."
+    assert psk.bones[0].name == b'ROOT', f"Expected bone name 'ROOT', but found {psk.bones[0].name}."

tests/psk_import_test.py

@@ -0,0 +1,340 @@
+import bpy
+import pytest
+
+from typing import cast as typing_cast
+from bpy.types import Mesh, Armature
+
+SUZANNE_FILEPATH = 'tests/data/Suzanne.psk'
+SARGE_FILEPATH = 'tests/data/CS_Sarge_S0_Skelmesh.pskx'
+SLURP_MONSTER_AXE_FILEPATH = 'tests/data/Slurp_Monster_Axe_LOD0.psk'
+BAT_FILEPATH = 'tests/data/Bat.psk'
+BLACK_WIDOW_FILEPATH = 'tests/data/SK_1033_1033001.pskx'
+
+
+@pytest.fixture(autouse=True)
+def run_before_and_after_Tests(tmpdir):
+    # Setup: Run before the tests
+    bpy.ops.wm.read_homefile(app_template='')
+    yield
+    # Teardown: Run after the tests
+    pass
+
+
+def test_psk_import_all():
+    assert bpy.ops.psk.import_file(
+        filepath=SUZANNE_FILEPATH,
+        components='ALL',
+        ) == {'FINISHED'}
+
+    armature_object = bpy.data.objects.get('Suzanne', None)
+
+    assert armature_object is not None, "Armature object not found in the scene"
+    assert armature_object.type == 'ARMATURE', "Armature object type should be ARMATURE"
+    assert armature_object is not None, "Armature object not found in the scene"
+    assert len(armature_object.children) == 1, "Armature object should have one child"
+
+    armature_data = typing_cast(Armature, armature_object.data)
+
+    assert len(armature_data.bones) == 1, "Armature should have one bone"
+
+    mesh_object = bpy.data.objects.get('Suzanne.001', None)
+    assert mesh_object is not None, "Mesh object not found in the scene"
+
+    mesh_data = typing_cast(Mesh, mesh_object.data)
+
+    assert len(mesh_data.vertices) == 507
+    assert len(mesh_data.polygons) == 968
+
+
+def test_psk_import_armature_only():
+    assert bpy.ops.psk.import_file(
+        filepath=SUZANNE_FILEPATH,
+        components='ARMATURE',
+        ) == {'FINISHED'}
+
+    armature_object = bpy.data.objects.get('Suzanne', None)
+
+    assert armature_object is not None, "Armature object not found in the scene"
+    assert armature_object.type == 'ARMATURE', "Armature object type should be ARMATURE"
+    assert len(armature_object.children) == 0, "Armature object should have no children"
+
+    armature_data = typing_cast(Armature, armature_object.data)
+
+    assert len(armature_data.bones) == 1, "Armature should have one bone"
+
+
+def test_psk_import_mesh_only():
+    assert bpy.ops.psk.import_file(
+        filepath=SUZANNE_FILEPATH,
+        components='MESH',
+        ) == {'FINISHED'}
+
+    mesh_object = bpy.data.objects.get('Suzanne', None)
+    assert mesh_object is not None, "Mesh object not found in the scene"
+    assert mesh_object.type == 'MESH', "Mesh object type should be MESH"
+
+    mesh_data = typing_cast(Mesh, mesh_object.data)
+
+    assert len(mesh_data.vertices) == 507
+    assert len(mesh_data.polygons) == 968
+
+
+def test_psk_import_scale():
+    """
+    Test the import of a PSK file with a scale factor of 2.0.
+    The scale factor is applied to the armature object.
+    """
+    assert bpy.ops.psk.import_file(
+        filepath=SUZANNE_FILEPATH,
+        components='ALL',
+        scale=2.0,
+        ) == {'FINISHED'}
+
+    armature_object = bpy.data.objects.get('Suzanne', None)
+    assert armature_object is not None, "Armature object not found in the scene"
+    assert armature_object.type == 'ARMATURE', "Armature object type should be ARMATURE"
+    assert tuple(armature_object.scale) == (2.0, 2.0, 2.0), "Armature object scale should be (2.0, 2.0, 2.0)"
+
+
+def test_psk_import_bone_length():
+    bone_length = 1.25
+
+    assert bpy.ops.psk.import_file(
+        filepath=SUZANNE_FILEPATH,
+        components='ARMATURE',
+        bone_length=bone_length,
+        ) == {'FINISHED'}
+    
+    armature_object = bpy.data.objects.get('Suzanne', None)
+    assert armature_object is not None, "Armature object not found in the scene"
+    assert armature_object.type == 'ARMATURE', "Armature object type should be ARMATURE"
+
+    armature_data = typing_cast(Armature, armature_object.data)
+    assert armature_data is not None, "Armature data not found in the scene"
+    assert len(armature_data.bones) == 1, "Armature should have one bone"
+    assert 'ROOT' in armature_data.bones, "Armature should have a bone named 'ROOT'"
+
+    root_bone = armature_data.bones['ROOT']
+    assert tuple(root_bone.head) == (0.0, 0.0, 0.0), "Bone head should be (0.0, 0.0, 0.0)"
+    assert tuple(root_bone.tail) == (0.0, bone_length, 0.0), f"Bone tail should be (0.0, {bone_length}, 0.0)"
+
+
+def test_psk_import_with_vertex_normals():
+    assert bpy.ops.psk.import_file(
+        filepath=SARGE_FILEPATH,
+        components='MESH',
+        should_import_vertex_normals=True,
+        ) == {'FINISHED'}
+
+    mesh_object = bpy.data.objects.get('CS_Sarge_S0_Skelmesh', None)
+    assert mesh_object is not None, "Mesh object not found in the scene"
+    assert mesh_object.type == 'MESH', "Mesh object type should be MESH"
+
+    mesh_data = typing_cast(Mesh, mesh_object.data)
+    assert mesh_data is not None, "Mesh data not found in the scene"
+    assert mesh_data.has_custom_normals, "Mesh should have custom normals"
+
+
+def test_psk_import_without_vertex_normals():
+    assert bpy.ops.psk.import_file(
+        filepath=SARGE_FILEPATH,
+        components='MESH',
+        should_import_vertex_normals=False,
+        ) == {'FINISHED'}
+
+    mesh_object = bpy.data.objects.get('CS_Sarge_S0_Skelmesh', None)
+    assert mesh_object is not None, "Mesh object not found in the scene"
+    assert mesh_object.type == 'MESH', "Mesh object type should be MESH"
+
+    mesh_data = typing_cast(Mesh, mesh_object.data)
+    assert mesh_data is not None, "Mesh data not found in the scene"
+    assert not mesh_data.has_custom_normals, "Mesh should not have custom normals"
+
+
+def test_psk_import_with_vertex_colors_srgba():
+    assert bpy.ops.psk.import_file(
+        filepath=SARGE_FILEPATH,
+        components='MESH',
+        should_import_vertex_colors=True,
+        vertex_color_space='SRGBA',
+        ) == {'FINISHED'}
+
+    mesh_object = bpy.data.objects.get('CS_Sarge_S0_Skelmesh', None)
+    assert mesh_object is not None, "Mesh object not found in the scene"
+    assert mesh_object.type == 'MESH', "Mesh object type should be MESH"
+
+    mesh_data = typing_cast(Mesh, mesh_object.data)
+    assert mesh_data is not None, "Mesh data not found in the scene"
+    assert len(mesh_data.color_attributes) == 1, "Mesh should have one vertex color layer"
+    assert mesh_data.color_attributes[0].name == 'VERTEXCOLOR', "Vertex color layer should be named 'VERTEXCOLOR'"
+    assert tuple(mesh_data.color_attributes[0].data[3303].color) == (0.34586891531944275, 0.0, 0.0, 1.0), "Unexpected vertex color value"
+
+
+def test_psk_import_vertex_colors_linear():
+    assert bpy.ops.psk.import_file(
+        filepath=SARGE_FILEPATH,
+        components='MESH',
+        should_import_vertex_colors=True,
+        vertex_color_space='LINEAR',
+        ) == {'FINISHED'}
+
+    mesh_object = bpy.data.objects.get('CS_Sarge_S0_Skelmesh', None)
+    assert mesh_object is not None, "Mesh object not found in the scene"
+    assert mesh_object.type == 'MESH', "Mesh object type should be MESH"
+
+    mesh_data = typing_cast(Mesh, mesh_object.data)
+    assert mesh_data is not None, "Mesh data not found in the scene"
+    assert len(mesh_data.color_attributes) == 1, "Mesh should have one vertex color layer"
+    assert mesh_data.color_attributes[0].name == 'VERTEXCOLOR', "Vertex color layer should be named 'VERTEXCOLOR'"
+    assert tuple(mesh_data.color_attributes[0].data[3303].color) == (0.09803921729326248, 0.0, 0.0, 1.0), "Unexpected vertex color value"
+
+
+def test_psk_import_without_vertex_colors():
+    assert bpy.ops.psk.import_file(
+        filepath=SARGE_FILEPATH,
+        components='MESH',
+        should_import_vertex_colors=False,
+        ) == {'FINISHED'}
+
+    mesh_object = bpy.data.objects.get('CS_Sarge_S0_Skelmesh', None)
+    assert mesh_object is not None, "Mesh object not found in the scene"
+    assert mesh_object.type == 'MESH', "Mesh object type should be MESH"
+
+    mesh_data = typing_cast(Mesh, mesh_object.data)
+    assert mesh_data is not None, "Mesh data not found in the scene"
+    assert len(mesh_data.color_attributes) == 0, "Mesh should not have any vertex color layers"
+
+
+def test_psk_import_extra_uvs():
+    assert bpy.ops.psk.import_file(
+        filepath=SARGE_FILEPATH,
+        components='MESH',
+        should_import_vertex_colors=True,
+        vertex_color_space='LINEAR',
+        ) == {'FINISHED'}
+
+    mesh_object = bpy.data.objects.get('CS_Sarge_S0_Skelmesh', None)
+    assert mesh_object is not None, "Mesh object not found in the scene"
+    assert mesh_object.type == 'MESH', "Mesh object type should be MESH"
+
+    mesh_data = typing_cast(Mesh, mesh_object.data)
+    assert mesh_data is not None, "Mesh data not found in the scene"
+    assert len(mesh_data.uv_layers) == 2, "Mesh should have two UV layers"
+
+    assert mesh_data.uv_layers[0].name == 'UVMap', "First UV layer should be named 'UVMap'"
+    assert mesh_data.uv_layers[1].name == 'EXTRAUV0', "Second UV layer should be named 'EXTRAUV0'"
+
+    # Verify that the data is actually different
+    assert mesh_data.uv_layers[0].uv[0].vector.x == 0.92480468750
+    assert mesh_data.uv_layers[0].uv[0].vector.y == 0.90533447265625
+    assert mesh_data.uv_layers[1].uv[0].vector.x == 3.0517578125e-05
+    assert mesh_data.uv_layers[1].uv[0].vector.y == 0.999969482421875
+
+
+def test_psk_import_many_extra_uvs():
+    assert bpy.ops.psk.import_file(
+        filepath=BLACK_WIDOW_FILEPATH,
+        components='MESH',
+        should_import_vertex_colors=False,
+        should_import_vertex_normals=False,
+        should_import_shape_keys=False,
+        ) == {'FINISHED'}
+
+    mesh_object = bpy.data.objects.get('SK_1033_1033001', None)
+    assert mesh_object is not None, "Mesh object not found in the scene"
+    assert mesh_object.type == 'MESH', "Mesh object type should be MESH"
+
+    mesh_data = typing_cast(Mesh, mesh_object.data)
+    assert mesh_data is not None, "Mesh data not found in the scene"
+    assert len(mesh_data.uv_layers) == 4, "Mesh should have two UV layers"
+
+    assert mesh_data.uv_layers[0].name == 'UVMap', "First UV layer should be named 'UVMap'"
+    assert mesh_data.uv_layers[1].name == 'EXTRAUV0', "Second UV layer should be named 'EXTRAUV0'"
+    assert mesh_data.uv_layers[2].name == 'EXTRAUV1', "Third UV layer should be named 'EXTRAUV1'"
+    assert mesh_data.uv_layers[3].name == 'EXTRAUV2', "Fourth UV layer should be named 'EXTRAUV2'"
+
+
+def test_psk_import_multiple_extra_uvs():
+    assert bpy.ops.psk.import_file(
+        filepath=SARGE_FILEPATH,
+        components='MESH',
+        should_import_vertex_colors=True,
+        vertex_color_space='LINEAR',
+        ) == {'FINISHED'}
+
+
+def test_psk_import_materials():
+    assert bpy.ops.psk.import_file(
+        filepath=SARGE_FILEPATH,
+        components='MESH',
+        ) == {'FINISHED'}
+
+    mesh_object = bpy.data.objects.get('CS_Sarge_S0_Skelmesh', None)
+    assert mesh_object is not None, "Mesh object not found in the scene"
+    assert mesh_object.type == 'MESH', "Mesh object type should be MESH"
+
+    mesh_data = typing_cast(Mesh, mesh_object.data)
+
+    assert mesh_data is not None, "Mesh data not found in the scene"
+    assert len(mesh_data.materials) == 4, "Mesh should have four materials"
+    material_names = (
+        'CS_Sarge_S0_MI',
+        'TP_Core_Eye_MI',
+        'AB_Sarge_S0_E_StimPack_MI1',
+        'CS_Sarge_S0_MI'
+    )
+    for i, material in enumerate(mesh_data.materials):
+        assert material is not None, f"Material {i} should not be None"
+        assert material.name == material_names[i], f"Material {i} name should be {material_names[i]}"
+
+
+def test_psk_import_shape_keys():
+    assert bpy.ops.psk.import_file(
+        filepath=SLURP_MONSTER_AXE_FILEPATH,
+        components='MESH',
+        ) == {'FINISHED'}
+
+    mesh_object = bpy.data.objects.get('Slurp_Monster_Axe_LOD0', None)
+    assert mesh_object is not None, "Mesh object not found in the scene"
+    assert mesh_object.type == 'MESH', "Mesh object type should be MESH"
+    mesh_data = typing_cast(Mesh, mesh_object.data)
+    assert mesh_data is not None, "Mesh data should not be None"
+    assert mesh_data.shape_keys is not None, "Mesh object should have shape keys"
+
+    shape_key_names = (
+        'MORPH_BASE',
+        'pickaxe',
+        'axe',
+        'Blob_03',
+        'Blob02',
+        'Blob01',
+    )
+    shape_keys = mesh_data.shape_keys.key_blocks
+    assert len(shape_keys) == 6, "Mesh object should have 6 shape keys"
+    for i, shape_key in enumerate(shape_keys):
+        expected_value = 1.0 if i == 0 else 0.0
+        assert shape_key.value == expected_value, f"Shape key {shape_key.name} should have a value of {expected_value} (found {shape_key.value})"
+        assert shape_key.name == shape_key_names[i], f"Shape key {i} name should be named {shape_key_names[i]}"
+
+
+def test_psk_import_without_shape_keys():
+    assert bpy.ops.psk.import_file(
+        filepath=SLURP_MONSTER_AXE_FILEPATH,
+        components='MESH',
+        should_import_shape_keys=False,
+        ) == {'FINISHED'}
+
+    mesh_object = bpy.data.objects.get('Slurp_Monster_Axe_LOD0', None)
+    assert mesh_object is not None, "Mesh object not found in the scene"
+    assert mesh_object.type == 'MESH', "Mesh object type should be MESH"
+
+    mesh_data = typing_cast(Mesh, mesh_object.data)
+    assert mesh_data is not None, "Mesh data should not be None"
+    assert mesh_data.shape_keys is None, "Mesh object should not have shape keys"
+
+
+def test_psk_import_with_invalid_faces():
+    assert bpy.ops.psk.import_file(
+        filepath=BAT_FILEPATH,
+        components='MESH'
+        ) == {'FINISHED'}

tests/requirements.txt

@@ -0,0 +1,3 @@
+pytest
+pytest-cov
+psk-psa-py == 0.0.4

tests/test.sh

@@ -0,0 +1,8 @@
+# usr/bin/env bash
+# This file is meant to be executed from inside a Docker container.
+# To run tests on the host system, use the `test.sh` script in the root directory.
+export BLENDER_EXECUTABLE=$(cat /blender_executable_path)
+pytest --cov-report xml --cov=/root/.config/blender -svv tests --blender-executable $BLENDER_EXECUTABLE --blender-addons-dirs ../addons
+# Fixes the paths in the coverage report to be relative to the current directory.
+sed -i 's|/root/.config/blender||g' coverage.xml
+sed -i 's|5.0/scripts/addons/io_scene_psk_psa/||g' coverage.xml