Removed MIT license file

Also added missing `files` permission

.github/workflows/main.yml

@@ -0,0 +1,48 @@
+name: Build Extension
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+    
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    env:
+      BLENDER_VERSION: blender-4.2.0-beta+v42.d19d23e91f65-linux.x86_64-release
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set derived environment variables
+        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
+      - name: Install Blender Dependencies
+        run: |
+          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
+        run: |
+          wget -q $BLENDER_URL
+          tar -xf $BLENDER_FILENAME
+          rm -rf $BLENDER_FILENAME
+      - name: Add Blender executable to path
+        run: |
+          echo "${{ github.workspace }}/${{ env.BLENDER_VERSION }}/" >> $GITHUB_PATH
+      - name: Build extension
+        run: |
+          pushd ./io_scene_psk_psa
+          blender --command extension build
+          mkdir artifact
+          unzip -q io_scene_psk_psa.zip -d ./artifact
+          popd
+      - name: Archive addon
+        uses: actions/upload-artifact@v4
+        with:
+          name: io_scene_psk_psa-${{ github.ref_name }}-${{ github.sha }}
+          path: |
+            ./io_scene_psk_psa/artifact/*

COPYING

@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
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+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

LICENSE

@@ -1,21 +0,0 @@
-MIT License
-
-Copyright (c) 2019 Darklight Games
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.

README.md

@@ -1,9 +1,23 @@
-[![Blender](https://img.shields.io/badge/Blender->=4.0-blue?logo=blender&logoColor=white)](https://www.blender.org/download/ "Download Blender")
+[![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)
 
 [![ko-fi](https://ko-fi.com/img/githubbutton_sm.svg)](https://ko-fi.com/L4L3853VR)
 
-This Blender add-on allows you to import and export meshes and animations to and from the [PSK and PSA file formats](https://wiki.beyondunreal.com/PSK_%26_PSA_file_formats) used in many versions of the Unreal Engine.
+This Blender addon allows you to import and export meshes and animations to and from the [PSK and PSA file formats](https://wiki.beyondunreal.com/PSK_%26_PSA_file_formats) used in many versions of the Unreal Engine.
+
+This software is licensed under the [GPLv3](https://www.gnu.org/licenses/gpl-3.0.html) license.
+
+# Compatibility
+
+| Blender Version | Addon Version | Long Term Support |
+|-|-|-|
+| [4.1](https://www.blender.org/download/releases/4-1/) | [latest](https://github.com/DarklightGames/io_scene_psk_psa/releases/latest)   | TBD |
+| [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) | TBD |
+| [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 |
+
+Bug fixes will 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 we will accept pull requests for bug fixes. 
 
 # Features
 * Full PSK/PSA import and export capabilities.
@@ -14,16 +28,6 @@ This Blender add-on allows you to import and export meshes and animations to and
 * 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) 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.
 
-## Compatibility
-
-| Blender Version                                              | Addon Version                                                                  | LTS Support       |
-|--------------------------------------------------------------|--------------------------------------------------------------------------------|-------------------|
-| 4.0+                                                         | [latest](https://github.com/DarklightGames/io_scene_psk_psa/releases/latest)   | TBD               |
-| [3.4 - 3.6](https://www.blender.org/download/lts/3-6/)       | [5.0.5](https://github.com/DarklightGames/io_scene_psk_psa/releases/tag/5.0.5) | ✅️ 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 | 
-
-Bug fixes will 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-on versions will no longer be supported by the maintainers of this repository, although we will accept pull requests for bug fixes. 
-
 # Installation
 1. Download the zip file for the latest version from the [releases](https://github.com/DarklightGames/io_export_psk_psa/releases) page.
 2. Open Blender 4.0.0 or later.
@@ -54,7 +58,15 @@ Bug fixes will be issued for legacy addon versions that are under [Blender's LTS
 3. Select the PSA file you want to import.
 4. Select the sequences that you want to import and click `Import`.
 
+> 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.
+
+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 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.
 

build.py

@@ -1,41 +0,0 @@
-import os
-import subprocess
-from fnmatch import fnmatch
-from zipfile import ZipFile, ZIP_DEFLATED
-
-ignore_patterns = [
-    '*/__pycache__/*',
-    '*/.git/*',
-    '*/.github/*',
-    '*/.idea/*',
-    '*/venv/*',
-    '*/.gitignore',
-    '*/.gitattributes',
-    '*/build/*',
-    '*/build.py',
-]
-
-
-def zipdir(path, zip_file: ZipFile):
-    for root, dirs, files in os.walk(path):
-        for file in files:
-            if file != zip_file.filename and not any(fnmatch(os.path.join(root, file), pattern) for pattern in ignore_patterns):
-                zip_file.write(os.path.join(root, file))
-
-# Get the branch name.
-branch = subprocess.check_output(['git', 'rev-parse', '--abbrev-ref', 'HEAD']).decode('utf-8').strip()
-
-# Get the most recent tag.
-tag = subprocess.check_output(['git', 'describe', '--tags', '--abbrev=0']).decode('utf-8').strip()
-
-# Create a zip file of the current directory.
-
-zip_path = f'./build/io_scene_psk_psa-{branch}-{tag}.zip'
-
-# Check that the directory exists, if it doesn't, create it.
-if not os.path.exists('./build'):
-    os.makedirs('./build')
-
-zipf = ZipFile(zip_path, 'w', ZIP_DEFLATED)
-zipdir('.', zipf)
-zipf.close()

io_scene_psk_psa/__init__.py

@@ -1,29 +1,19 @@
 from bpy.app.handlers import persistent
 
-bl_info = {
-    "name": "PSK/PSA Importer/Exporter",
-    "author": "Colin Basnett, Yurii Ti",
-    "version": (6, 0, 0),
-    "blender": (4, 0, 0),
-    "description": "PSK/PSA Import/Export (.psk/.psa)",
-    "warning": "",
-    "doc_url": "https://github.com/DarklightGames/io_scene_psk_psa",
-    "tracker_url": "https://github.com/DarklightGames/io_scene_psk_psa/issues",
-    "category": "Import-Export"
-}
-
 if 'bpy' in locals():
     import importlib
 
-    importlib.reload(psx_data)
-    importlib.reload(psx_helpers)
-    importlib.reload(psx_types)
+    importlib.reload(shared_data)
+    importlib.reload(shared_helpers)
+    importlib.reload(shared_types)
 
     importlib.reload(psk_data)
     importlib.reload(psk_reader)
     importlib.reload(psk_writer)
     importlib.reload(psk_builder)
     importlib.reload(psk_importer)
+    importlib.reload(psk_properties)
+    importlib.reload(psk_ui)
     importlib.reload(psk_export_properties)
     importlib.reload(psk_export_operators)
     importlib.reload(psk_export_ui)
@@ -34,6 +24,7 @@ if 'bpy' in locals():
     importlib.reload(psa_reader)
     importlib.reload(psa_writer)
     importlib.reload(psa_builder)
+    importlib.reload(psa_importer)
     importlib.reload(psa_export_properties)
     importlib.reload(psa_export_operators)
     importlib.reload(psa_export_ui)
@@ -41,37 +32,32 @@ if 'bpy' in locals():
     importlib.reload(psa_import_operators)
     importlib.reload(psa_import_ui)
 else:
-    # if i remove this line, it can be enabled just fine
-    from . import data as psx_data
-    from . import helpers as psx_helpers
-    from . import types as psx_types
-    from .psk import data as psk_data
-    from .psk import reader as psk_reader
-    from .psk import writer as psk_writer
-    from .psk import builder as psk_builder
-    from .psk import importer as psk_importer
-    from .psk.export import properties as psk_export_properties
-    from .psk.export import operators as psk_export_operators
-    from .psk.export import ui as psk_export_ui
+    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 data as psa_data
-    from .psa import config as psa_config
-    from .psa import reader as psa_reader
-    from .psa import writer as psa_writer
-    from .psa import builder as psa_builder
-    from .psa import importer as psa_importer
-    from .psa.export import properties as psa_export_properties
-    from .psa.export import operators as psa_export_operators
-    from .psa.export import ui as psa_export_ui
-    from .psa.import_ import properties as psa_import_properties
+    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
+    from .psa.import_ import ui as psa_import_ui, properties as psa_import_properties
 
 import bpy
 from bpy.props import PointerProperty
 
-classes = psx_types.classes +\
+# 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 +\
@@ -107,13 +93,15 @@ def register():
     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=psx_types.PSX_PG_action_export)
+    bpy.types.Action.psa_export = PointerProperty(type=shared_types.PSX_PG_action_export)
 
 
 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

io_scene_psk_psa/blender_manifest.toml

@@ -0,0 +1,27 @@
+schema_version = "1.0.0"
+id = "io_scene_psk_psa"
+version = "7.1.0"
+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"
+# Optional: maximum supported Blender version
+# blender_version_max = "5.1.0"
+license = [
+  "SPDX:GPL-3.0-or-later",
+]
+
+[build]
+paths_exclude_pattern = [
+  "/.git/",
+  "__pycache__/",
+  "/venv/",
+  "/.github/",
+  ".gitignore",
+]
+
+[permissions]
+files = "Import/export PSK and PSA files from/to disk"

io_scene_psk_psa/psa/builder.py

@@ -3,7 +3,7 @@ from typing import Optional
 from bpy.types import Armature, Bone, Action, PoseBone
 
 from .data import *
-from ..helpers import *
+from ..shared.helpers import *
 
 
 class PsaBuildSequence:

io_scene_psk_psa/psa/config.py

@@ -13,36 +13,66 @@ class PsaConfig:
         self.sequence_bone_flags: Dict[str, Dict[int, int]] = dict()
 
 
+def _load_config_file(file_path: str) -> ConfigParser:
+    """
+    UEViewer exports a dialect of INI files that is not compatible with Python's ConfigParser.
+    Specifically, it allows values in this format:
+
+    [Section]
+    Key1
+    Key2
+
+    This is not allowed in Python's ConfigParser, which requires a '=' character after each key name.
+    To work around this, we'll modify the file to add the '=' character after each key name if it is missing.
+    """
+    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]
+
+    contents = '\n'.join(lines)
+
+    config = ConfigParser()
+    config.read_string(contents)
+
+    return config
+
+
+def _get_bone_flags_from_value(value: str) -> int:
+    match value:
+        case 'all':
+            return REMOVE_TRACK_LOCATION | REMOVE_TRACK_ROTATION
+        case 'trans':
+            return REMOVE_TRACK_LOCATION
+        case 'rot':
+            return REMOVE_TRACK_ROTATION
+        case _:
+            return 0
+
+
 def read_psa_config(psa_reader: PsaReader, file_path: str) -> PsaConfig:
     psa_config = PsaConfig()
 
-    config = ConfigParser()
-    config.read(file_path)
-
-    psa_sequence_names = list(psa_reader.sequences.keys())
-    lowercase_sequence_names = [sequence_name.lower() for sequence_name in psa_sequence_names]
+    config = _load_config_file(file_path)
 
     if config.has_section('RemoveTracks'):
         for key, value in config.items('RemoveTracks'):
             match = re.match(f'^(.+)\.(\d+)$', key)
             sequence_name = match.group(1)
-            bone_index = int(match.group(2))
 
             # 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:
-                pass
+                # Sequence name is not in the PSA file.
+                continue
 
             if sequence_name not in psa_config.sequence_bone_flags:
                 psa_config.sequence_bone_flags[sequence_name] = dict()
 
-            match value:
-                case 'all':
-                    psa_config.sequence_bone_flags[sequence_name][bone_index] = (REMOVE_TRACK_LOCATION | REMOVE_TRACK_ROTATION)
-                case 'trans':
-                    psa_config.sequence_bone_flags[sequence_name][bone_index] = REMOVE_TRACK_LOCATION
-                case 'rot':
-                    psa_config.sequence_bone_flags[sequence_name][bone_index] = REMOVE_TRACK_ROTATION
+            bone_index = int(match.group(2))
+            psa_config.sequence_bone_flags[sequence_name][bone_index] = _get_bone_flags_from_value(value)
 
     return psa_config

io_scene_psk_psa/psa/data.py

@@ -2,12 +2,12 @@ import typing
 from collections import OrderedDict
 from typing import List
 
-from ..data import *
+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:

io_scene_psk_psa/psa/export/operators.py

@@ -11,7 +11,7 @@ from bpy_types import Operator
 from .properties import PSA_PG_export, PSA_PG_export_action_list_item, filter_sequences
 from ..builder import build_psa, PsaBuildSequence, PsaBuildOptions
 from ..writer import write_psa
-from ...helpers import populate_bone_collection_list, get_nla_strips_in_frame_range
+from ...shared.helpers import populate_bone_collection_list, get_nla_strips_in_frame_range
 
 
 def is_action_for_armature(armature: Armature, action: Action):
@@ -47,7 +47,7 @@ def update_actions_and_timeline_markers(context: Context, armature: Armature):
         if not is_action_for_armature(armature, action):
             continue
 
-        if not action.name.startswith('#'):
+        if action.name != '' and not action.name.startswith('#'):
             for (name, frame_start, frame_end) in get_sequences_from_action(action):
                 item = pg.action_list.add()
                 item.action = action
@@ -60,9 +60,9 @@ def update_actions_and_timeline_markers(context: Context, armature: Armature):
         # Pose markers are not guaranteed to be in frame-order, so make sure that they are.
         pose_markers = sorted(action.pose_markers, key=lambda x: x.frame)
         for pose_marker_index, pose_marker in enumerate(pose_markers):
-            if pose_marker.name.startswith('#'):
+            if pose_marker.name.strip() == '' or pose_marker.name.startswith('#'):
                 continue
-            for (name, frame_start, frame_end) in get_sequences_from_action_pose_marker(action, pose_markers, pose_marker, pose_marker_index):
+            for (name, frame_start, frame_end) in get_sequences_from_action_pose_markers(action, pose_markers, pose_marker, pose_marker_index):
                 item = pg.action_list.add()
                 item.action = action
                 item.name = name
@@ -78,7 +78,7 @@ def update_actions_and_timeline_markers(context: Context, armature: Armature):
     for marker_name in marker_names:
         if marker_name not in sequence_frame_ranges:
             continue
-        if marker_name.startswith('#'):
+        if marker_name.strip() == '' or marker_name.startswith('#'):
             continue
         frame_start, frame_end = sequence_frame_ranges[marker_name]
         sequences = get_sequences_from_name_and_frame_range(marker_name, frame_start, frame_end)
@@ -91,14 +91,15 @@ def update_actions_and_timeline_markers(context: Context, armature: Armature):
 
 
 def get_sequence_fps(context: Context, fps_source: str, fps_custom: float, actions: Iterable[Action]) -> float:
-    if fps_source == 'SCENE':
+    match fps_source:
+        case 'SCENE':
             return context.scene.render.fps
-    elif fps_source == 'CUSTOM':
+        case 'CUSTOM':
             return fps_custom
-    elif fps_source == 'ACTION_METADATA':
+        case 'ACTION_METADATA':
             # Get the minimum value of action metadata FPS values.
             return min([action.psa_export.fps for action in actions])
-    else:
+        case _:
             raise RuntimeError(f'Invalid FPS source "{fps_source}"')
 
 
@@ -110,7 +111,7 @@ def get_animation_data_object(context: Context) -> Object:
     if active_object.type != 'ARMATURE':
         raise RuntimeError('Selected object must be an Armature')
 
-    if pg.should_override_animation_data:
+    if pg.sequence_source != 'ACTIONS' and pg.should_override_animation_data:
         animation_data_object = pg.animation_data_override
     else:
         animation_data_object = active_object
@@ -187,13 +188,18 @@ def get_sequences_from_action(action: Action) -> List[Tuple[str, int, int]]:
     return get_sequences_from_name_and_frame_range(action.name, frame_start, frame_end)
 
 
-def get_sequences_from_action_pose_marker(action: Action, pose_markers: List[TimelineMarker], pose_marker: TimelineMarker, pose_marker_index: int) -> List[Tuple[str, int, int]]:
+def get_sequences_from_action_pose_markers(action: Action, pose_markers: List[TimelineMarker], pose_marker: TimelineMarker, pose_marker_index: int) -> List[Tuple[str, int, int]]:
     frame_start = pose_marker.frame
-    if pose_marker_index + 1 < len(pose_markers):
+    sequence_name = pose_marker.name
+    if pose_marker.name.startswith('!'):
+        # If the pose marker name starts with an exclamation mark, only export the first frame.
+        frame_end = frame_start
+        sequence_name = sequence_name[1:]
+    elif pose_marker_index + 1 < len(pose_markers):
         frame_end = pose_markers[pose_marker_index + 1].frame
     else:
         frame_end = int(action.frame_range[1])
-    return get_sequences_from_name_and_frame_range(pose_marker.name, frame_start, frame_end)
+    return get_sequences_from_name_and_frame_range(sequence_name, frame_start, frame_end)
 
 
 def get_visible_sequences(pg: PSA_PG_export, sequences) -> List[PSA_PG_export_action_list_item]:
@@ -390,6 +396,8 @@ class PSA_OT_export(Operator, ExportHelper):
                 export_sequence.nla_state.frame_start = nla_strip_item.frame_start
                 export_sequence.nla_state.frame_end = nla_strip_item.frame_end
                 export_sequence.fps = get_sequence_fps(context, pg.fps_source, pg.fps_custom, [nla_strip_item.action])
+                export_sequence.compression_ratio = nla_strip_item.action.psa_export.compression_ratio
+                export_sequence.key_quota = nla_strip_item.action.psa_export.key_quota
                 export_sequences.append(export_sequence)
         else:
             raise ValueError(f'Unhandled sequence source: {pg.sequence_source}')

io_scene_psk_psa/psa/export/properties.py

@@ -7,7 +7,7 @@ from bpy.props import BoolProperty, PointerProperty, EnumProperty, FloatProperty
     StringProperty
 from bpy.types import PropertyGroup, Object, Action, AnimData, Context
 
-from ...types import PSX_PG_bone_collection_list_item
+from ...shared.types import PSX_PG_bone_collection_list_item
 
 
 def psa_export_property_group_animation_data_override_poll(_context, obj):
@@ -44,12 +44,13 @@ class PSA_PG_export_nla_strip_list_item(PropertyGroup):
 
 def nla_track_update_cb(self: 'PSA_PG_export', context: Context) -> None:
     self.nla_strip_list.clear()
-    if context.object is None or context.object.animation_data is None:
-        return
     match = re.match(r'^(\d+).+$', self.nla_track)
     self.nla_track_index = int(match.group(1)) if match else -1
     if self.nla_track_index >= 0:
-        nla_track = context.object.animation_data.nla_tracks[self.nla_track_index]
+        animation_data = get_animation_data(self, context)
+        if animation_data is 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
@@ -152,7 +153,7 @@ class PSA_PG_export(PropertyGroup):
         default=False,
         name='Enforce Bone Name Restrictions',
         description='Bone names restrictions will be enforced. Note that bone names without properly formatted names '
-                    'cannot be referenced in scripts'
+                    '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)

io_scene_psk_psa/psa/export/ui.py

@@ -30,21 +30,19 @@ class PSA_UL_export_sequences(UIList):
         pg = getattr(context.scene, 'psa_export')
         row = layout.row()
         subrow = row.row(align=True)
-        subrow.prop(pg, 'sequence_filter_name', text="")
-        subrow.prop(pg, 'sequence_use_filter_invert', text="", icon='ARROW_LEFTRIGHT')
-        # subrow.prop(pg, 'sequence_use_filter_sort_reverse', text='', icon='SORT_ASC')
+        subrow.prop(pg, 'sequence_filter_name', text='')
+        subrow.prop(pg, 'sequence_use_filter_invert', text='', icon='ARROW_LEFTRIGHT')
 
         if pg.sequence_source == 'ACTIONS':
             subrow = row.row(align=True)
             subrow.prop(pg, 'sequence_filter_asset', icon_only=True, icon='ASSET_MANAGER')
             subrow.prop(pg, 'sequence_filter_pose_marker', icon_only=True, icon='PMARKER')
-            subrow.prop(pg, 'sequence_filter_reversed', text="", icon='FRAME_PREV')
+            subrow.prop(pg, 'sequence_filter_reversed', text='', icon='FRAME_PREV')
 
     def filter_items(self, context, data, prop):
         pg = getattr(context.scene, 'psa_export')
         actions = getattr(data, prop)
         flt_flags = filter_sequences(pg, actions)
-        # flt_neworder = bpy.types.UI_UL_list.sort_items_by_name(actions, 'name')
         flt_neworder = list(range(len(actions)))
         return flt_flags, flt_neworder
 

io_scene_psk_psa/psa/import_/operators.py

@@ -2,7 +2,7 @@ import os
 from pathlib import Path
 
 from bpy.props import StringProperty
-from bpy.types import Operator, Event, Context
+from bpy.types import Operator, Event, Context, FileHandler
 from bpy_extras.io_utils import ImportHelper
 
 from .properties import get_visible_sequences
@@ -89,23 +89,6 @@ class PSA_OT_import_sequences_deselect_all(Operator):
         return {'FINISHED'}
 
 
-class PSA_OT_import_select_file(Operator):
-    bl_idname = 'psa_import.select_file'
-    bl_label = 'Select'
-    bl_options = {'INTERNAL'}
-    bl_description = 'Select a PSA file from which to import animations'
-    filepath: StringProperty(subtype='FILE_PATH')
-    filter_glob: StringProperty(default="*.psa", options={'HIDDEN'})
-
-    def execute(self, context):
-        getattr(context.scene, 'psa_import').psa_file_path = self.filepath
-        return {"FINISHED"}
-
-    def invoke(self, context, event):
-        context.window_manager.fileselect_add(self)
-        return {"RUNNING_MODAL"}
-
-
 def load_psa_file(context, filepath: str):
     pg = context.scene.psa_import
     pg.sequence_list.clear()
@@ -158,6 +141,10 @@ class PSA_OT_import(Operator, ImportHelper):
         psa_reader = PsaReader(self.filepath)
         sequence_names = [x.action_name for x in pg.sequence_list if x.is_selected]
 
+        if len(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
@@ -171,14 +158,14 @@ class PSA_OT_import(Operator, ImportHelper):
         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))
-
-        if len(sequence_names) == 0:
-            self.report({'ERROR_INVALID_CONTEXT'}, 'No sequences selected')
-            return {'CANCELLED'}
+                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)
 
@@ -203,18 +190,18 @@ class PSA_OT_import(Operator, ImportHelper):
         layout = self.layout
         pg = getattr(context.scene, 'psa_import')
 
+        sequences_header, sequences_panel = layout.panel('sequences_panel_id', default_closed=False)
+        sequences_header.label(text='Sequences')
+
+        if sequences_panel:
             if pg.psa_error:
-            row = layout.row()
+                row = sequences_panel.row()
                 row.label(text='Select a PSA file', icon='ERROR')
             else:
-            box = layout.box()
-
-            box.label(text=f'Sequences ({len(pg.sequence_list)})', icon='ARMATURE_DATA')
-
                 # Select buttons.
                 rows = max(3, min(len(pg.sequence_list), 10))
 
-            row = box.row()
+                row = sequences_panel.row()
                 col = row.column()
 
                 row2 = col.row(align=True)
@@ -226,42 +213,59 @@ class PSA_OT_import(Operator, ImportHelper):
                 col = col.row()
                 col.template_list('PSA_UL_import_sequences', '', pg, 'sequence_list', pg, 'sequence_list_index', rows=rows)
 
-        col = layout.column(heading='')
+            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 = layout.column(heading='Write')
+        data_header, data_panel = layout.panel('data_panel_id', default_closed=False)
+        data_header.label(text='Data')
+
+        if data_panel:
+            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 = layout.column()
+            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')
+
+        advanced_header, advanced_panel = layout.panel('advanced_panel_id', default_closed=True)
+        advanced_header.label(text='Advanced')
+
+        if advanced_panel:
+            col = advanced_panel.column()
             col.use_property_split = True
             col.use_property_decorate = False
             col.prop(pg, 'bone_mapping_mode')
 
-        if pg.should_write_keyframes:
-            col = layout.column(heading='Keyframes')
-            col.use_property_split = True
-            col.use_property_decorate = False
-            col.prop(pg, 'should_convert_to_samples')
-            col.separator()
-            # FPS
-            col.prop(pg, 'fps_source')
-            if pg.fps_source == 'CUSTOM':
-                col.prop(pg, 'fps_custom')
-
-        col = layout.column(heading='Options')
+            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_action_name_prefix')
+            col.prop(pg, 'should_use_config_file')
 
-        if pg.should_use_action_name_prefix:
-            col.prop(pg, 'action_name_prefix')
+
+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_file_extensions = '.psa'
+
+    @classmethod
+    def poll_drop(cls, context: Context):
+        return context.area and context.area.type == 'VIEW_3D'
 
 
 classes = (
@@ -269,5 +273,5 @@ classes = (
     PSA_OT_import_sequences_deselect_all,
     PSA_OT_import_sequences_from_text,
     PSA_OT_import,
-    PSA_OT_import_select_file,
+    PSA_FH_import,
 )

io_scene_psk_psa/psa/import_/properties.py

@@ -32,6 +32,12 @@ class PSA_PG_import(PropertyGroup):
                                        description='Assign each imported action a fake user so that the data block is '
                                                    'saved even it has no users',
                                        options=empty_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)
     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)
@@ -65,23 +71,38 @@ class PSA_PG_import(PropertyGroup):
             ('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'
     )
     fps_source: EnumProperty(name='FPS Source', items=(
         ('SEQUENCE', 'Sequence', 'The sequence frame rate matches the original frame rate', 'ACTION', 0),
-        ('SCENE', 'Scene', 'The sequence frame rate dilates to match that of the scene', 'SCENE_DATA', 1),
-        ('CUSTOM', 'Custom', 'The sequence frame rate dilates to match a custom frame rate', 2),
+        ('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_custom: FloatProperty(
         default=30.0,
         name='Custom FPS',
-        description='The frame rate to which the imported actions will be converted',
+        description='The frame rate to which the imported sequences will be resampled to',
         options=empty_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_custom: FloatProperty(
+        default=1.0,
+        name='Custom Compression Ratio',
+        description='The compression ratio to apply to the imported sequences',
+        options=empty_set,
+        min=0.0,
+        soft_min=0.0,
+        soft_max=1.0,
+        step=0.0625,
+    )
 
 
 def filter_sequences(pg: PSA_PG_import, sequences) -> List[int]:

io_scene_psk_psa/psa/import_/ui.py

@@ -4,7 +4,7 @@ from bpy.types import UIList
 from .properties import filter_sequences
 
 
-class PSA_UL_sequences(UIList):
+class PSA_UL_sequences_mixin(UIList):
     def draw_item(self, context, layout, data, item, icon, active_data, active_property, index, flt_flag):
         row = layout.row(align=True)
         split = row.split(align=True, factor=0.75)
@@ -17,10 +17,10 @@ class PSA_UL_sequences(UIList):
         pg = getattr(context.scene, 'psa_import')
         row = layout.row()
         sub_row = row.row(align=True)
-        sub_row.prop(pg, 'sequence_filter_name', text="")
-        sub_row.prop(pg, 'sequence_use_filter_invert', text="", icon='ARROW_LEFTRIGHT')
-        sub_row.prop(pg, 'sequence_use_filter_regex', text="", icon='SORTBYEXT')
-        sub_row.prop(pg, 'sequence_filter_is_selected', text="", icon='CHECKBOX_HLT')
+        sub_row.prop(pg, 'sequence_filter_name', text='')
+        sub_row.prop(pg, 'sequence_use_filter_invert', text='', icon='ARROW_LEFTRIGHT')
+        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_):
         pg = getattr(context.scene, 'psa_import')
@@ -30,11 +30,15 @@ class PSA_UL_sequences(UIList):
         return flt_flags, flt_neworder
 
 
-class PSA_UL_import_sequences(PSA_UL_sequences, UIList):
+class PSA_UL_sequences(PSA_UL_sequences_mixin):
     pass
 
 
-class PSA_UL_import_actions(PSA_UL_sequences, UIList):
+class PSA_UL_import_sequences(PSA_UL_sequences_mixin):
+    pass
+
+
+class PSA_UL_import_actions(PSA_UL_sequences_mixin):
     pass
 
 

io_scene_psk_psa/psa/importer.py

@@ -2,7 +2,7 @@ import typing
 from typing import List, Optional
 
 import bpy
-import numpy
+import numpy as np
 from bpy.types import FCurve, Object, Context
 from mathutils import Vector, Quaternion
 
@@ -24,6 +24,7 @@ class PsaImportOptions(object):
         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()
 
 
@@ -45,16 +46,16 @@ def _calculate_fcurve_data(import_bone: ImportBone, key_data: typing.Iterable[fl
     key_location = Vector(key_data[4:])
     q = import_bone.post_rotation.copy()
     q.rotate(import_bone.original_rotation)
-    quat = q
+    rotation = q
     q = import_bone.post_rotation.copy()
     if import_bone.parent is None:
         q.rotate(key_rotation.conjugated())
     else:
         q.rotate(key_rotation)
-    quat.rotate(q.conjugated())
-    loc = key_location - import_bone.original_location
-    loc.rotate(import_bone.post_rotation.conjugated())
-    return quat.w, quat.x, quat.y, quat.z, loc.x, loc.y, loc.z
+    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
 
 
 class PsaImportResult:
@@ -78,6 +79,51 @@ def _get_armature_bone_index_for_psa_bone(psa_bone_name: str, 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.
+    """
+    if frame_step == 1.0:
+        # No resampling is necessary.
+        return sequence_data_matrix
+
+    source_frame_count, bone_count = sequence_data_matrix.shape[:2]
+    sample_frame_times = list(_get_sample_frame_times(source_frame_count, frame_step))
+    target_frame_count = len(sample_frame_times)
+    resampled_sequence_data_matrix = np.zeros((target_frame_count, bone_count, 7), dtype=float)
+
+    for sample_frame_index, sample_frame_time in enumerate(sample_frame_times):
+        frame_index = int(sample_frame_time)
+        if sample_frame_time % 1.0 == 0.0:
+            # Sample time has no fractional part, so just copy the frame.
+            resampled_sequence_data_matrix[sample_frame_index, :, :] = sequence_data_matrix[frame_index, :, :]
+        else:
+            # Sample time has a fractional part, so interpolate between two frames.
+            next_frame_index = frame_index + 1
+            for bone_index in range(bone_count):
+                source_frame_1_data = sequence_data_matrix[frame_index, bone_index, :]
+                source_frame_2_data = sequence_data_matrix[next_frame_index, bone_index, :]
+                factor = sample_frame_time - frame_index
+                q = Quaternion((source_frame_1_data[:4])).slerp(Quaternion((source_frame_2_data[:4])), factor)
+                q.normalize()
+                l = Vector(source_frame_1_data[4:]).lerp(Vector(source_frame_2_data[4:]), factor)
+                resampled_sequence_data_matrix[sample_frame_index, bone_index, :] = q.w, q.x, q.y, q.z, l.x, l.y, l.z
+
+    return resampled_sequence_data_matrix
+
 
 def import_psa(context: Context, psa_reader: PsaReader, armature_object: Object, options: PsaImportOptions) -> PsaImportResult:
     result = PsaImportResult()
@@ -97,7 +143,7 @@ def import_psa(context: Context, psa_reader: PsaReader, armature_object: Object,
         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:
-                psa_to_armature_bone_indices[psa_bone_index] = armature_bone_names.index(psa_bone_name)
+                psa_to_armature_bone_indices[psa_bone_index] = armature_bone_index
                 armature_to_psa_bone_indices[armature_bone_index] = psa_bone_index
             else:
                 # This armature bone has already been mapped to a PSA bone.
@@ -126,7 +172,7 @@ def import_psa(context: Context, psa_reader: PsaReader, armature_object: Object,
 
     # Create intermediate bone data for import operations.
     import_bones = []
-    import_bones_dict = dict()
+    psa_bone_names_to_import_bones = dict()
 
     for (psa_bone_index, psa_bone), psa_bone_name in zip(enumerate(psa_reader.bones), psa_bone_names):
         if psa_bone_index not in psa_to_armature_bone_indices:
@@ -136,15 +182,22 @@ def import_psa(context: Context, psa_reader: PsaReader, armature_object: Object,
         import_bone = ImportBone(psa_bone)
         import_bone.armature_bone = armature_data.bones[psa_bone_name]
         import_bone.pose_bone = armature_object.pose.bones[psa_bone_name]
-        import_bones_dict[psa_bone_name] = import_bone
+        psa_bone_names_to_import_bones[psa_bone_name] = import_bone
         import_bones.append(import_bone)
 
+    bones_with_missing_parents = []
+
     for import_bone in filter(lambda x: x is not None, import_bones):
         armature_bone = import_bone.armature_bone
-        if armature_bone.parent is not None and armature_bone.parent.name in psa_bone_names:
-            import_bone.parent = import_bones_dict[armature_bone.parent.name]
+        has_parent = armature_bone.parent is not None
+        if has_parent:
+            if armature_bone.parent.name in psa_bone_names:
+                import_bone.parent = psa_bone_names_to_import_bones[armature_bone.parent.name]
+            else:
+                # Add a warning if the parent bone is not in the PSA.
+                bones_with_missing_parents.append(armature_bone)
         # Calculate the original location & rotation of each bone (in world-space maybe?)
-        if import_bone.parent is not None:
+        if has_parent:
             import_bone.original_location = armature_bone.matrix_local.translation - armature_bone.parent.matrix_local.translation
             import_bone.original_location.rotate(armature_bone.parent.matrix_local.to_quaternion().conjugated())
             import_bone.original_rotation = armature_bone.matrix_local.to_quaternion()
@@ -152,9 +205,16 @@ def import_psa(context: Context, psa_reader: PsaReader, armature_object: Object,
             import_bone.original_rotation.conjugate()
         else:
             import_bone.original_location = armature_bone.matrix_local.translation.copy()
-            import_bone.original_rotation = armature_bone.matrix_local.to_quaternion()
+            import_bone.original_rotation = armature_bone.matrix_local.to_quaternion().conjugated()
+
         import_bone.post_rotation = import_bone.original_rotation.conjugated()
 
+    # Warn about bones with missing parents.
+    if len(bones_with_missing_parents) > 0:
+        count = len(bones_with_missing_parents)
+        message = f'{count} bone(s) have parents that are not present in the PSA:\n' + str([x.name for x in bones_with_missing_parents])
+        result.warnings.append(message)
+
     context.window_manager.progress_begin(0, len(sequences))
 
     # Create and populate the data for new sequences.
@@ -175,22 +235,19 @@ def import_psa(context: Context, psa_reader: PsaReader, armature_object: Object,
             action = bpy.data.actions.new(name=action_name)
 
         # Calculate the target FPS.
-        target_fps = sequence.fps
-        if options.fps_source == 'CUSTOM':
+        match options.fps_source:
+            case 'CUSTOM':
                 target_fps = options.fps_custom
-        elif options.fps_source == 'SCENE':
+            case 'SCENE':
                 target_fps = context.scene.render.fps
-        elif options.fps_source == 'SEQUENCE':
+            case 'SEQUENCE':
                 target_fps = sequence.fps
-        else:
+            case _:
                 raise ValueError(f'Unknown FPS source: {options.fps_source}')
 
-        keyframe_time_dilation = target_fps / sequence.fps
-
         if options.should_write_keyframes:
-            # Remove existing f-curves (replace with action.fcurves.clear() in Blender 3.2)
-            while len(action.fcurves) > 0:
-                action.fcurves.remove(action.fcurves[-1])
+            # Remove existing f-curves.
+            action.fcurves.clear()
 
             # 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():
@@ -224,19 +281,25 @@ def import_psa(context: Context, psa_reader: PsaReader, armature_object: Object,
                     # Calculate the local-space key data for the bone.
                     sequence_data_matrix[frame_index, bone_index] = _calculate_fcurve_data(import_bone, key_data)
 
-            # Write the keyframes out.
-            fcurve_data = numpy.zeros(2 * sequence.frame_count, dtype=float)
+            # Resample the sequence data to the target FPS.
+            # If the target frame count is the same as the source frame count, this will be a no-op.
+            resampled_sequence_data_matrix = _resample_sequence_data_matrix(sequence_data_matrix,
+                                                                            frame_step=sequence.fps / target_fps)
+
+            # Write the keyframes out.
+            # Note that the f-curve data consists of alternating time and value data.
+            target_frame_count = resampled_sequence_data_matrix.shape[0]
+            fcurve_data = np.zeros(2 * target_frame_count, dtype=float)
+            fcurve_data[0::2] = range(0, target_frame_count)
 
-            # Populate the keyframe time data.
-            fcurve_data[0::2] = [x * keyframe_time_dilation for x in range(sequence.frame_count)]
             for bone_index, import_bone in enumerate(import_bones):
                 if import_bone is None:
                     continue
                 for fcurve_index, fcurve in enumerate(import_bone.fcurves):
                     if fcurve is None:
                         continue
-                    fcurve_data[1::2] = sequence_data_matrix[:, bone_index, fcurve_index]
-                    fcurve.keyframe_points.add(sequence.frame_count)
+                    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)
                     for fcurve_keyframe in fcurve.keyframe_points:
                         fcurve_keyframe.interpolation = 'LINEAR'

io_scene_psk_psa/psa/reader.py

@@ -11,8 +11,7 @@ def _try_fix_cue4parse_issue_103(sequences) -> bool:
     # 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:
-        if sequences[0].frame_start_index == sequences[0].frame_count:
+    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

io_scene_psk_psa/psa/writer.py

@@ -2,7 +2,7 @@ from ctypes import Structure, sizeof
 from typing import Type
 
 from .data import Psa
-from ..data import Section
+from ..shared.data import Section
 
 
 def write_section(fp, name: bytes, data_type: Type[Structure] = None, data: list = None):

io_scene_psk_psa/psk/builder.py

@@ -1,15 +1,19 @@
+from typing import Optional
+
 import bmesh
 import bpy
-from bpy.types import Armature
+import numpy as np
+from bpy.types import Armature, Material
 
 from .data import *
-from ..helpers import *
+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 = None
+        self.armature_object: Optional[Object] = None
 
 
 class PskBuildOptions(object):
@@ -17,17 +21,15 @@ class PskBuildOptions(object):
         self.bone_filter_mode = 'ALL'
         self.bone_collection_indices: List[int] = []
         self.use_raw_mesh_data = True
-        self.material_names: List[str] = []
+        self.materials: List[Material] = []
         self.should_enforce_bone_name_restrictions = False
 
 
 def get_psk_input_objects(context) -> PskInputObjects:
     input_objects = PskInputObjects()
     for selected_object in context.view_layer.objects.selected:
-        if selected_object.type != 'MESH':
-            raise RuntimeError(f'Selected object "{selected_object.name}" is not a mesh')
-
-    input_objects.mesh_objects = context.view_layer.objects.selected
+        if selected_object.type == 'MESH':
+            input_objects.mesh_objects.append(selected_object)
 
     if len(input_objects.mesh_objects) == 0:
         raise RuntimeError('At least one mesh must be selected')
@@ -61,7 +63,7 @@ def get_psk_input_objects(context) -> PskInputObjects:
 class PskBuildResult(object):
     def __init__(self):
         self.psk = None
-        self.warnings = []
+        self.warnings: List[str] = []
 
 
 def build_psk(context, options: PskBuildOptions) -> PskBuildResult:
@@ -72,9 +74,9 @@ def build_psk(context, options: PskBuildOptions) -> PskBuildResult:
     psk = Psk()
     bones = []
 
-    if armature_object is None:
-        # If the mesh has no armature object, simply assign it a dummy bone at the root to satisfy the requirement
-        # that a PSK file must have at least one bone.
+    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
@@ -135,18 +137,24 @@ def build_psk(context, options: PskBuildOptions) -> PskBuildResult:
             psk.bones.append(psk_bone)
 
     # MATERIALS
-    material_names = options.material_names
-
-    for material_name in material_names:
+    for material in options.materials:
         psk_material = Psk.Material()
         try:
-            psk_material.name = bytes(material_name, encoding='windows-1252')
+            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')
+            raise RuntimeError(f'Material name "{material.name}" contains characters that cannot be encoded in the Windows-1252 codepage')
         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)
         psk.materials.append(psk_material)
 
-    for input_mesh_object in input_objects.mesh_objects:
+    context.window_manager.progress_begin(0, len(input_objects.mesh_objects))
+
+    material_names = [m.name for m in options.materials]
+
+    for object_index, input_mesh_object in enumerate(input_objects.mesh_objects):
+
+        should_flip_normals = False
 
         # MATERIALS
         material_indices = [material_names.index(material_slot.material.name) for material_slot in input_mesh_object.material_slots]
@@ -175,8 +183,16 @@ def build_psk(context, options: PskBuildOptions) -> PskBuildResult:
             mesh_object.matrix_world = input_mesh_object.matrix_world
 
             scale = (input_mesh_object.scale.x, input_mesh_object.scale.y, input_mesh_object.scale.z)
-            if any(map(lambda x: x < 0, scale)):
-                result.warnings.append(f'Mesh "{input_mesh_object.name}" has negative scaling which may result in inverted normals.')
+
+            # 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
 
             # Copy the vertex groups
             for vertex_group in input_mesh_object.vertex_groups:
@@ -205,11 +221,11 @@ def build_psk(context, options: PskBuildOptions) -> PskBuildResult:
         # Build a list of non-unique wedges.
         wedges = []
         for loop_index, loop in enumerate(mesh_data.loops):
-            wedge = Psk.Wedge()
-            wedge.point_index = loop.vertex_index + vertex_offset
-            wedge.u, wedge.v = uv_layer[loop_index].uv
-            wedge.v = 1.0 - wedge.v
-            wedges.append(wedge)
+            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]
+            ))
 
         # Assign material indices to the wedges.
         for triangle in mesh_data.loop_triangles:
@@ -217,8 +233,8 @@ def build_psk(context, options: PskBuildOptions) -> PskBuildResult:
                 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
-        wedge_indices = {}
-        loop_wedge_indices = [-1] * len(mesh_data.loops)
+        wedge_indices = dict()
+        loop_wedge_indices = np.full(len(mesh_data.loops), -1)
         for loop_index, wedge in enumerate(wedges):
             wedge_hash = hash(wedge)
             if wedge_hash in wedge_indices:
@@ -231,6 +247,7 @@ def build_psk(context, options: PskBuildOptions) -> PskBuildResult:
 
         # 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]
@@ -240,6 +257,11 @@ def build_psk(context, options: PskBuildOptions) -> PskBuildResult:
             face.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]
+
         # WEIGHTS
         if armature_object is not None:
             armature_data = typing.cast(Armature, armature_object.data)
@@ -288,6 +310,10 @@ def build_psk(context, options: PskBuildOptions) -> PskBuildResult:
             bpy.data.meshes.remove(mesh_data)
             del mesh_data
 
+        context.window_manager.progress_update(object_index)
+
+    context.window_manager.progress_end()
+
     result.psk = psk
 
     return result

io_scene_psk_psa/psk/data.py

@@ -1,15 +1,15 @@
 from typing import List
 
-from ..data import *
+from ..shared.data import *
 
 
 class Psk(object):
     class Wedge(object):
-        def __init__(self):
-            self.point_index: int = 0
-            self.u: float = 0.0
-            self.v: float = 0.0
-            self.material_index: int = 0
+        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}')

io_scene_psk_psa/psk/export/operators.py

@@ -4,7 +4,7 @@ from bpy_extras.io_utils import ExportHelper
 
 from ..builder import build_psk, PskBuildOptions, get_psk_input_objects
 from ..writer import write_psk
-from ...helpers import populate_bone_collection_list
+from ...shared.helpers import populate_bone_collection_list
 
 
 def is_bone_filter_mode_item_available(context, identifier):
@@ -20,19 +20,19 @@ def is_bone_filter_mode_item_available(context, identifier):
 def populate_material_list(mesh_objects, material_list):
     material_list.clear()
 
-    material_names = []
+    materials = []
     for mesh_object in mesh_objects:
         for i, material_slot in enumerate(mesh_object.material_slots):
             material = material_slot.material
             # TODO: put this in the poll arg?
             if material is None:
                 raise RuntimeError('Material slot cannot be empty (index ' + str(i) + ')')
-            if material.name not in material_names:
-                material_names.append(material.name)
+            if material not in materials:
+                materials.append(material)
 
-    for index, material_name in enumerate(material_names):
+    for index, material in enumerate(materials):
         m = material_list.add()
-        m.material_name = material_name
+        m.material = material
         m.index = index
 
 
@@ -51,7 +51,7 @@ class PSK_OT_material_list_move_up(Operator):
         pg = getattr(context.scene, 'psk_export')
         pg.material_list.move(pg.material_list_index, pg.material_list_index - 1)
         pg.material_list_index -= 1
-        return {"FINISHED"}
+        return {'FINISHED'}
 
 
 class PSK_OT_material_list_move_down(Operator):
@@ -69,7 +69,7 @@ class PSK_OT_material_list_move_down(Operator):
         pg = getattr(context.scene, 'psk_export')
         pg.material_list.move(pg.material_list_index, pg.material_list_index + 1)
         pg.material_list_index += 1
-        return {"FINISHED"}
+        return {'FINISHED'}
 
 
 class PSK_OT_export(Operator, ExportHelper):
@@ -121,15 +121,17 @@ class PSK_OT_export(Operator, ExportHelper):
         pg = getattr(context.scene, 'psk_export')
 
         # MESH
-        box = layout.box()
-        box.label(text='Mesh', icon='MESH_DATA')
-        box.prop(pg, 'use_raw_mesh_data')
+        mesh_header, mesh_panel = layout.panel('01_mesh', default_closed=False)
+        mesh_header.label(text='Mesh', icon='MESH_DATA')
+        if mesh_panel:
+            mesh_panel.prop(pg, 'use_raw_mesh_data')
 
         # BONES
-        box = layout.box()
-        box.label(text='Bones', icon='BONE_DATA')
+        bones_header, bones_panel = layout.panel('02_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 = box.row(align=True)
+            row = bones_panel.row(align=True)
             for item in bone_filter_mode_items:
                 identifier = item.identifier
                 item_layout = row.row(align=True)
@@ -137,16 +139,17 @@ class PSK_OT_export(Operator, ExportHelper):
                 item_layout.enabled = is_bone_filter_mode_item_available(context, identifier)
 
             if pg.bone_filter_mode == 'BONE_COLLECTIONS':
-            row = box.row()
+                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)
 
-        box.prop(pg, 'should_enforce_bone_name_restrictions')
+            bones_panel.prop(pg, 'should_enforce_bone_name_restrictions')
 
         # MATERIALS
-        box = layout.box()
-        box.label(text='Materials', icon='MATERIAL')
-        row = box.row()
+        materials_header, materials_panel = layout.panel('03_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)
@@ -159,7 +162,7 @@ class PSK_OT_export(Operator, ExportHelper):
         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.use_raw_mesh_data = pg.use_raw_mesh_data
-        options.material_names = [m.material_name for m in pg.material_list]
+        options.materials = [m.material for m in pg.material_list]
         options.should_enforce_bone_name_restrictions = pg.should_enforce_bone_name_restrictions
         
         try:

io_scene_psk_psa/psk/export/properties.py

@@ -1,18 +1,19 @@
-from bpy.props import EnumProperty, CollectionProperty, IntProperty, BoolProperty, StringProperty
-from bpy.types import PropertyGroup
+from bpy.props import EnumProperty, CollectionProperty, IntProperty, BoolProperty, PointerProperty
+from bpy.types import PropertyGroup, Material
 
-from ...types import PSX_PG_bone_collection_list_item
+from ...shared.types import PSX_PG_bone_collection_list_item
 
+empty_set = set()
 
 class PSK_PG_material_list_item(PropertyGroup):
-    material_name: StringProperty()
+    material: PointerProperty(type=Material)
     index: IntProperty()
 
 
 class PSK_PG_export(PropertyGroup):
     bone_filter_mode: EnumProperty(
         name='Bone Filter',
-        options=set(),
+        options=empty_set,
         description='',
         items=(
             ('ALL', 'All', 'All bones will be exported'),

io_scene_psk_psa/psk/export/ui.py

@@ -4,7 +4,7 @@ from bpy.types import UIList
 class PSK_UL_materials(UIList):
     def draw_item(self, context, layout, data, item, icon, active_data, active_propname, index):
         row = layout.row()
-        row.label(text=str(getattr(item, 'material_name')), icon='MATERIAL')
+        row.prop(item.material, 'name', text='', emboss=False, icon_value=layout.icon(item.material))
 
 
 classes = (

io_scene_psk_psa/psk/import_/operators.py

@@ -2,7 +2,7 @@ import os
 import sys
 
 from bpy.props import StringProperty, BoolProperty, EnumProperty, FloatProperty
-from bpy.types import Operator
+from bpy.types import Operator, FileHandler, Context
 from bpy_extras.io_utils import ImportHelper
 
 from ..importer import PskImportOptions, import_psk
@@ -11,6 +11,17 @@ from ..reader import read_psk
 empty_set = set()
 
 
+class PSK_FH_import(FileHandler):
+    bl_idname = 'PSK_FH_import'
+    bl_label = 'File handler for Unreal PSK/PSKX import'
+    bl_import_operator = 'import_scene.psk'
+    bl_file_extensions = '.psk;.pskx'
+
+    @classmethod
+    def poll_drop(cls, context: Context):
+        return context.area and context.area.type == 'VIEW_3D'
+
+
 class PSK_OT_import(Operator, ImportHelper):
     bl_idname = 'import_scene.psk'
     bl_label = 'Import'
@@ -27,8 +38,8 @@ class PSK_OT_import(Operator, ImportHelper):
     should_import_vertex_colors: BoolProperty(
         default=True,
         options=empty_set,
-        name='Vertex Colors',
-        description='Import vertex colors from PSKX files, if available'
+        name='Import Vertex Colors',
+        description='Import vertex colors, if available'
     )
     vertex_color_space: EnumProperty(
         name='Vertex Color Space',
@@ -42,13 +53,13 @@ class PSK_OT_import(Operator, ImportHelper):
     )
     should_import_vertex_normals: BoolProperty(
         default=True,
-        name='Vertex Normals',
+        name='Import Vertex Normals',
         options=empty_set,
         description='Import vertex normals, if available'
     )
     should_import_extra_uvs: BoolProperty(
         default=True,
-        name='Extra UVs',
+        name='Import Extra UVs',
         options=empty_set,
         description='Import extra UV maps, if available'
     )
@@ -63,12 +74,6 @@ class PSK_OT_import(Operator, ImportHelper):
         name='Import Materials',
         options=empty_set,
     )
-    should_reuse_materials: BoolProperty(
-        default=True,
-        name='Reuse Materials',
-        options=empty_set,
-        description='Existing materials with matching names will be reused when available'
-    )
     should_import_skeleton: BoolProperty(
         default=True,
         name='Import Skeleton',
@@ -82,14 +87,20 @@ class PSK_OT_import(Operator, ImportHelper):
         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='Shape Keys',
+        name='Import Shape Keys',
         options=empty_set,
         description='Import shape keys, if available'
     )
+    scale: FloatProperty(
+        name='Scale',
+        default=1.0,
+        soft_min=0.0,
+    )
 
     def execute(self, context):
         psk = read_psk(self.filepath)
@@ -105,6 +116,11 @@ class PSK_OT_import(Operator, ImportHelper):
         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 not options.should_import_mesh and not options.should_import_skeleton:
+            self.report({'ERROR'}, 'Nothing to import')
+            return {'CANCELLED'}
 
         result = import_psk(psk, context, options)
 
@@ -113,32 +129,48 @@ class PSK_OT_import(Operator, ImportHelper):
             message += '\n'.join(result.warnings)
             self.report({'WARNING'}, message)
         else:
-            self.report({'INFO'}, f'PSK imported')
+            self.report({'INFO'}, f'PSK imported ({options.name})')
 
         return {'FINISHED'}
 
     def draw(self, context):
         layout = self.layout
-        layout.prop(self, 'should_import_materials')
-        layout.prop(self, 'should_import_mesh')
-        row = layout.column()
-        row.use_property_split = True
-        row.use_property_decorate = False
-        if self.should_import_mesh:
-            row.prop(self, 'should_import_vertex_normals')
-            row.prop(self, 'should_import_extra_uvs')
-            row.prop(self, 'should_import_vertex_colors')
+
+        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:
-                row.prop(self, 'vertex_color_space')
-            row.prop(self, 'should_import_shape_keys')
-        layout.prop(self, 'should_import_skeleton')
-        row = layout.column()
-        row.use_property_split = True
-        row.use_property_decorate = False
-        if self.should_import_skeleton:
-            row.prop(self, 'bone_length')
+                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')
 
 
 classes = (
     PSK_OT_import,
+    PSK_FH_import,
 )

io_scene_psk_psa/psk/importer.py

@@ -1,4 +1,3 @@
-from math import inf
 from typing import Optional, List
 
 import bmesh
@@ -8,7 +7,8 @@ from bpy.types import VertexGroup
 from mathutils import Quaternion, Vector, Matrix
 
 from .data import Psk
-from ..helpers import rgb_to_srgb, is_bdk_addon_loaded
+from .properties import poly_flags_to_triangle_type_and_bit_flags
+from ..shared.helpers import rgb_to_srgb, is_bdk_addon_loaded
 
 
 class PskImportOptions:
@@ -17,19 +17,20 @@ class PskImportOptions:
         self.should_import_mesh = True
         self.should_reuse_materials = True
         self.should_import_vertex_colors = True
-        self.vertex_color_space = 'sRGB'
+        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_shape_keys = True
         self.bone_length = 1.0
         self.should_import_materials = True
+        self.scale = 1.0
 
 
 class ImportBone:
-    """
+    '''
     Intermediate bone type for the purpose of construction.
-    """
+    '''
     def __init__(self, index: int, psk_bone: Psk.Bone):
         self.index: int = index
         self.psk_bone: Psk.Bone = psk_bone
@@ -52,6 +53,7 @@ class PskImportResult:
 def import_psk(psk: Psk, context, options: PskImportOptions) -> PskImportResult:
     result = PskImportResult()
     armature_object = None
+    mesh_object = None
 
     if options.should_import_skeleton:
         # ARMATURE
@@ -133,6 +135,9 @@ def import_psk(psk: Psk, context, options: PskImportOptions) -> PskImportResult:
                 else:
                     # 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)
 
@@ -144,6 +149,7 @@ def import_psk(psk: Psk, context, options: PskImportOptions) -> PskImportResult:
 
         bm.verts.ensure_lookup_table()
 
+        # 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))
@@ -164,70 +170,69 @@ def import_psk(psk: Psk, context, options: PskImportOptions) -> PskImportResult:
         bm.to_mesh(mesh_data)
 
         # TEXTURE COORDINATES
-        data_index = 0
-        uv_layer = mesh_data.uv_layers.new(name='VTXW0000')
+        uv_layer_data_index = 0
+        uv_layer = mesh_data.uv_layers.new(name='UVMap')
         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[data_index].uv = wedge.u, 1.0 - wedge.v
-                data_index += 1
+                uv_layer.data[uv_layer_data_index].uv = wedge.u, 1.0 - wedge.v
+                uv_layer_data_index += 1
 
         # 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):
-                data_index = 0
+                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[data_index].uv = u, 1.0 - v
-                        data_index += 1
+                        uv_layer.data[uv_layer_data_index].uv = u, 1.0 - v
+                        uv_layer_data_index += 1
                 wedge_index_offset += len(psk.wedges)
 
         # VERTEX COLORS
         if psk.has_vertex_colors and options.should_import_vertex_colors:
-            size = (len(psk.points), 4)
-            vertex_colors = np.full(size, inf)
-            vertex_color_data = mesh_data.vertex_colors.new(name='VERTEXCOLOR')
-            ambiguous_vertex_color_point_indices = []
+            # 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
 
-            for wedge_index, wedge in enumerate(psk.wedges):
-                point_index = wedge.point_index
-                psk_vertex_color = psk.vertex_colors[wedge_index].normalized()
-                if vertex_colors[point_index, 0] != inf and tuple(vertex_colors[point_index]) != psk_vertex_color:
-                    ambiguous_vertex_color_point_indices.append(point_index)
-                else:
-                    vertex_colors[point_index] = psk_vertex_color
+            # Map the PSK vertex colors to the face corners.
+            face_count = len(psk.faces) - len(invalid_face_indices)
+            face_corner_colors = np.full((face_count * 3, 4), 1.0)
+            face_corner_color_index = 0
+            for face_index, face in enumerate(psk.faces):
+                if face_index in invalid_face_indices:
+                    continue
+                for wedge_index in reversed(face.wedge_indices):
+                    face_corner_colors[face_corner_color_index] = psk_vertex_colors[wedge_index]
+                    face_corner_color_index += 1
 
-            if options.vertex_color_space == 'SRGBA':
-                for i in range(vertex_colors.shape[0]):
-                    vertex_colors[i, :3] = tuple(map(lambda x: rgb_to_srgb(x), vertex_colors[i, :3]))
-
-            for loop_index, loop in enumerate(mesh_data.loops):
-                vertex_color = vertex_colors[loop.vertex_index]
-                if vertex_color is not None:
-                    vertex_color_data.data[loop_index].color = vertex_color
-                else:
-                    vertex_color_data.data[loop_index].color = 1.0, 1.0, 1.0, 1.0
-
-            if len(ambiguous_vertex_color_point_indices) > 0:
-                result.warnings.append(
-                    f'{len(ambiguous_vertex_color_point_indices)} vertex(es) with ambiguous vertex colors.')
+            # 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())
 
         # 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))
+            mesh_data.polygons.foreach_set('use_smooth', [True] * len(mesh_data.polygons))
             normals = []
             for vertex_normal in psk.vertex_normals:
                 normals.append(tuple(vertex_normal))
             mesh_data.normals_split_custom_set_from_vertices(normals)
-            mesh_data.use_auto_smooth = True
+        else:
+            mesh_data.shade_smooth()
 
         bm.normal_update()
         bm.free()
@@ -265,6 +270,9 @@ def import_psk(psk: Psk, context, options: PskImportOptions) -> PskImportResult:
             armature_modifier.object = armature_object
             mesh_object.parent = armature_object
 
+    root_object = armature_object if options.should_import_skeleton else mesh_object
+    root_object.scale = (options.scale, options.scale, options.scale)
+
     try:
         bpy.ops.object.mode_set(mode='OBJECT')
     except:

io_scene_psk_psa/psk/properties.py

@@ -0,0 +1,48 @@
+from bpy.props import EnumProperty
+from bpy.types import PropertyGroup
+
+mesh_triangle_types_items = (
+    ('NORMAL', 'Normal', 'Normal one-sided', 0),
+    ('NORMAL_TWO_SIDED', 'Normal Two-Sided', 'Normal but two-sided', 1),
+    ('TRANSLUCENT', 'Translucent', 'Translucent two-sided', 2),
+    ('MASKED', 'Masked', 'Masked two-sided', 3),
+    ('MODULATE', 'Modulate', 'Modulation blended two-sided', 4),
+    ('PLACEHOLDER', 'Placeholder', 'Placeholder triangle for positioning weapon. Invisible', 8),
+)
+
+mesh_triangle_bit_flags_items = (
+    ('UNLIT', 'Unlit', 'Full brightness, no lighting', 16),
+    ('FLAT', 'Flat', 'Flat surface, don\'t do bMeshCurvy thing', 32),
+    ('ENVIRONMENT', 'Environment', 'Environment mapped', 64),
+    ('NO_SMOOTH', 'No Smooth', 'No bilinear filtering on this poly\'s texture', 128),
+)
+
+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_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}
+
+
+def triangle_type_and_bit_flags_to_poly_flags(mesh_triangle_type: str, mesh_triangle_bit_flags: set[str]) -> int:
+    poly_flags = 0
+    poly_flags |= mesh_triangle_types_items_dict.get(mesh_triangle_type, 0)
+    for flag in mesh_triangle_bit_flags:
+        poly_flags |= mesh_triangle_bit_flags_items_dict.get(flag, 0)
+    return poly_flags
+
+
+def poly_flags_to_triangle_type_and_bit_flags(poly_flags: int) -> (str, set[str]):
+    try:
+        triangle_type = next(item[0] for item in mesh_triangle_types_items if item[3] == (poly_flags & 15))
+    except StopIteration:
+        triangle_type = 'NORMAL'
+    triangle_bit_flags = {item[0] for item in mesh_triangle_bit_flags_items if item[3] & poly_flags}
+    return triangle_type, triangle_bit_flags
+
+
+classes = (
+    PSX_PG_material,
+)

io_scene_psk_psa/psk/reader.py

@@ -23,7 +23,7 @@ def _read_material_references(path: str) -> List[str]:
         return []
     # Do a crude regex match to find the Material list entries.
     contents = property_file_path.read_text()
-    pattern = r"Material\s*=\s*([^\s^,]+)"
+    pattern = r'Material\s*=\s*([^\s^,]+)'
     return re.findall(pattern, contents)
 
 

io_scene_psk_psa/psk/ui.py

@@ -0,0 +1,28 @@
+from bpy.types import Panel
+
+
+class PSK_PT_material(Panel):
+    bl_label = 'PSK Material'
+    bl_idname = 'PSK_PT_material'
+    bl_space_type = 'PROPERTIES'
+    bl_region_type = 'WINDOW'
+    bl_context = 'material'
+    bl_options = {'DEFAULT_CLOSED'}
+
+    @classmethod
+    def poll(cls, context):
+        return context.material is not None
+
+    def draw(self, context):
+        layout = self.layout
+        layout.use_property_split = True
+        layout.use_property_decorate = False
+        material = context.material
+        layout.prop(material.psk, 'mesh_triangle_type')
+        col = layout.column()
+        col.prop(material.psk, 'mesh_triangle_bit_flags', expand=True, text='Flags')
+
+
+classes = (
+    PSK_PT_material,
+)

io_scene_psk_psa/psk/writer.py

@@ -2,11 +2,11 @@ from ctypes import Structure, sizeof
 from typing import Type
 
 from .data import Psk
-from ..data import Section, Vector3
+from ..shared.data import Section, Vector3
 
 MAX_WEDGE_COUNT = 65536
 MAX_POINT_COUNT = 4294967296
-MAX_BONE_COUNT = 256
+MAX_BONE_COUNT = 2147483647
 MAX_MATERIAL_COUNT = 256
 
 

io_scene_psk_psa/shared/types.py

@@ -51,5 +51,5 @@ classes = (
     PSX_PG_action_export,
     PSX_PG_bone_collection_list_item,
     PSX_UL_bone_collection_list,
-    PSX_PT_action
+    PSX_PT_action,
 )