Implemented multiple PSA import (#55)

This can be invoked by drag-and-dropping multiple PSA files onto the
Blender viewport when you have the target armature selected

.github/workflows/main.yml

@@ -0,0 +1,54 @@
+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-linux-x64
+      ADDON_NAME: io_scene_psk_psa
+    steps:
+      - uses: actions/checkout@v3
+      - uses: SebRollen/toml-action@v1.2.0
+        id: read_manifest
+        with:
+          file: '${{ env.ADDON_NAME }}/blender_manifest.toml'
+          field: 'version'
+      - name: Set derived environment variables
+        run: |
+          echo "BLENDER_FILENAME=${{ env.BLENDER_VERSION }}.tar.xz" >> $GITHUB_ENV
+          echo "BLENDER_URL=https://mirrors.iu13.net/blender/release/Blender4.2/${{ 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 }}/" >> $GITHUB_PATH
+      - name: Build extension
+        run: |
+          pushd ./${{ env.ADDON_NAME }}
+          blender --command extension build
+          mkdir artifact
+          unzip -q ${{ env.ADDON_NAME }}-${{ steps.read_manifest.outputs.value }}.zip -d ./artifact
+          popd
+      - name: Archive addon
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ env.ADDON_NAME }}-${{ github.ref_name }}-${{ github.sha }}
+          path: |
+            ./${{ env.ADDON_NAME }}/artifact/*

COPYING

@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
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+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+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

@@ -1,39 +1,48 @@
 [![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 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.
 
-# 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. 
+This software is licensed under the [GPLv3](https://www.gnu.org/licenses/gpl-3.0.html) license.
 
 # Features
 * Full PSK/PSA import and export capabilities.
 * Non-standard file section data is supported for import only (vertex normals, extra UV channels, vertex colors, shape keys).
 * Fine-grained PSA sequence importing for efficient workflow when working with large PSA files.
-* PSA sequence metadata (e.g., frame rate, sequence name) is preserved on import, allowing this data to be reused on export.
+* PSA sequence metadata (e.g., frame rate) is preserved on import, allowing this data to be reused on export.
 * Specific bone collections can be excluded from PSK/PSA export (useful for excluding non-contributing bones such as IK controllers).
-* PSA sequences can be exported directly from actions or delineated using a scene's [timeline markers](https://docs.blender.org/manual/en/latest/animation/markers.html) or NLA track strips, allowing direct use of the [NLA](https://docs.blender.org/manual/en/latest/editors/nla/index.html) when creating sequences.
+* PSA sequences can be exported directly from actions or delineated using a scene's [timeline markers](https://docs.blender.org/manual/en/latest/animation/markers.html), pose markers, or NLA track strips, allowing direct use of the [NLA](https://docs.blender.org/manual/en/latest/editors/nla/index.html) when creating sequences.
 * Manual re-ordering of material slots when exporting multiple mesh objects.
 
 # Installation
-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.
+For Blender 4.2 and higher, it is recommended to download the latest version from the [Blender Extensions](https://extensions.blender.org/add-ons/io-scene-psk-psa/) platform.
+
+For Blender 4.1 and lower, you can install the addon manually by following these steps:
+
+1. Download the .zip file of the latest compatible version for your Blender version (see [Legacy Compatibility](#legacy-compatibility)).
+2. Open Blender.
 3. Navigate to the Blender Preferences (`Edit` > `Preferences`).
 4. Select the `Add-ons` tab.
 5. Click the `Install...` button.
 6. Select the .zip file that you downloaded earlier and click `Install Add-on`.
 7. Enable the newly added `Import-Export: PSK/PSA Importer/Exporter` addon.
 
+# Legacy Compatibility
+
+Below is a table of the latest addon versions that are compatible with older versions of Blender. These versions are no longer maintained and may contain bugs that have been fixed in newer versions. It is recommended to use the latest version of the addon for the best experience.
+
+Critical bug fixes may be issued for legacy addon versions that are under [Blender's LTS maintenance period](https://www.blender.org/download/lts/). Once the LTS period has ended, legacy addon versions will no longer be supported by the maintainers of this repository, although the releases will still be available for download.
+
+| Blender Version| Addon Version                                                                  | Long Term Support |
+|-|--------------------------------------------------------------------------------|-----------------|
+| [4.1](https://www.blender.org/download/releases/4-1/)        | [7.0.0](https://github.com/DarklightGames/io_scene_psk_psa/releases/tag/7.0.0) | No              |
+| [4.0](https://www.blender.org/download/releases/4-0/)        | [6.2.1](https://github.com/DarklightGames/io_scene_psk_psa/releases/tag/6.2.1) | No              |
+| [3.4 - 3.6](https://www.blender.org/download/lts/3-6/)       | [5.0.6](https://github.com/DarklightGames/io_scene_psk_psa/releases/tag/5.0.6) | June 2025       |
+| [2.93 - 3.3](https://www.blender.org/download/releases/3-3/) | [4.3.0](https://github.com/DarklightGames/io_scene_psk_psa/releases/tag/4.3.0) | September 2024  |
+
 # Usage
 ## Exporting a PSK
 1. Select the mesh objects you wish to export.
@@ -68,3 +77,5 @@ The PSA importer creates [Actions](https://docs.blender.org/manual/en/latest/ani
 If preserving the mesh normals of models is important for your workflow, it is *not recommended* to export PSK files from UE Viewer. This is because UE Viewer makes no attempt to reconstruct the original [smoothing groups](https://en.wikipedia.org/wiki/Smoothing_group). As a result, the normals of imported PSK files will be incorrect when imported into Blender and will need to be manually fixed.
 
 As a workaround, it is recommended to export [glTF](https://en.wikipedia.org/wiki/GlTF) meshes out of UE Viewer instead, since the glTF format has support for explicit normals and UE Viewer can correctly preserve the mesh normals on export. Note, however, that the imported glTF armature may have it's bones oriented incorrectly when imported into Blender. To mitigate this, you can combine the armature of PSK and the mesh of the glTF for best results.
+
+There is also an open pull request to add support for exporting explicit normals from UE Viewer in the future: https://github.com/gildor2/UEViewer/pull/277.

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

@@ -1,23 +1,11 @@
 from bpy.app.handlers import persistent
 
-bl_info = {
-    'name': 'PSK/PSA Importer/Exporter',
-    'author': 'Colin Basnett, Yurii Ti',
-    'version': (7, 0, 0),
-    'blender': (4, 1, 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)
@@ -44,39 +32,30 @@ 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 import properties as psk_properties
-    from .psk import ui as psk_ui
-    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 +\
@@ -118,7 +97,7 @@ def register():
     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():

io_scene_psk_psa/blender_manifest.toml

@@ -0,0 +1,27 @@
+schema_version = "1.0.0"
+id = "io_scene_psk_psa"
+version = "7.1.2"
+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

@@ -1,8 +1,6 @@
 import re
 from configparser import ConfigParser
-from typing import Dict
-
-from .reader import PsaReader
+from typing import Dict, List
 
 REMOVE_TRACK_LOCATION = (1 << 0)
 REMOVE_TRACK_ROTATION = (1 << 1)
@@ -28,7 +26,7 @@ def _load_config_file(file_path: str) -> ConfigParser:
     with open(file_path, 'r') as f:
         lines = f.read().split('\n')
 
-    lines = [re.sub(r'^\s*(\w+)\s*$', r'\1=', line) for line in lines]
+    lines = [re.sub(r'^\s*([^=]+)\s*$', r'\1=', line) for line in lines]
 
     contents = '\n'.join(lines)
 
@@ -50,7 +48,7 @@ def _get_bone_flags_from_value(value: str) -> int:
             return 0
 
 
-def read_psa_config(psa_reader: PsaReader, file_path: str) -> PsaConfig:
+def read_psa_config(psa_sequence_names: List[str], file_path: str) -> PsaConfig:
     psa_config = PsaConfig()
 
     config = _load_config_file(file_path)
@@ -62,7 +60,6 @@ def read_psa_config(psa_reader: PsaReader, file_path: str) -> PsaConfig:
 
             # Map the sequence name onto the actual sequence name in the PSA file.
             try:
-                psa_sequence_names = list(psa_reader.sequences.keys())
                 lowercase_sequence_names = [sequence_name.lower() for sequence_name in psa_sequence_names]
                 sequence_name = psa_sequence_names[lowercase_sequence_names.index(sequence_name.lower())]
             except ValueError:

io_scene_psk_psa/psa/data.py

@@ -2,7 +2,7 @@ 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.

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):
@@ -62,7 +62,7 @@ def update_actions_and_timeline_markers(context: Context, armature: Armature):
         for pose_marker_index, pose_marker in enumerate(pose_markers):
             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
@@ -188,13 +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]:
@@ -209,7 +214,7 @@ class PSA_OT_export(Operator, ExportHelper):
     bl_idname = 'psa_export.operator'
     bl_label = 'Export'
     bl_options = {'INTERNAL', 'UNDO'}
-    __doc__ = 'Export actions to PSA'
+    bl_description = 'Export actions to PSA'
     filename_ext = '.psa'
     filter_glob: StringProperty(default='*.psa', options={'HIDDEN'})
     filepath: StringProperty(
@@ -234,28 +239,29 @@ class PSA_OT_export(Operator, ExportHelper):
         layout = self.layout
         pg = getattr(context.scene, 'psa_export')
 
-        # FPS
-        layout.prop(pg, 'fps_source', text='FPS')
-        if pg.fps_source == 'CUSTOM':
-            layout.prop(pg, 'fps_custom', text='Custom')
+        sequences_header, sequences_panel = layout.panel('Sequences', default_closed=False)
+        sequences_header.label(text='Sequences', icon='ACTION')
 
-        # SOURCE
-        layout.prop(pg, 'sequence_source', text='Source')
+        if sequences_panel:
+            flow = sequences_panel.grid_flow()
+            flow.use_property_split = True
+            flow.use_property_decorate = False
+            flow.prop(pg, 'sequence_source', text='Source')
 
             if pg.sequence_source in {'TIMELINE_MARKERS', 'NLA_TRACK_STRIPS'}:
                 # ANIMDATA SOURCE
-            layout.prop(pg, 'should_override_animation_data')
+                flow.prop(pg, 'should_override_animation_data')
                 if pg.should_override_animation_data:
-                layout.prop(pg, 'animation_data_override', text='')
+                    flow.prop(pg, 'animation_data_override', text=' ')
 
             if pg.sequence_source == 'NLA_TRACK_STRIPS':
-            flow = layout.grid_flow()
+                flow = sequences_panel.grid_flow()
                 flow.use_property_split = True
                 flow.use_property_decorate = False
                 flow.prop(pg, 'nla_track')
 
             # SELECT ALL/NONE
-        row = layout.row(align=True)
+            row = sequences_panel.row(align=True)
             row.label(text='Select')
             row.operator(PSA_OT_export_actions_select_all.bl_idname, text='All', icon='CHECKBOX_HLT')
             row.operator(PSA_OT_export_actions_deselect_all.bl_idname, text='None', icon='CHECKBOX_DEHLT')
@@ -263,19 +269,19 @@ class PSA_OT_export(Operator, ExportHelper):
             # ACTIONS
             if pg.sequence_source == 'ACTIONS':
                 rows = max(3, min(len(pg.action_list), 10))
-            layout.template_list('PSA_UL_export_sequences', '', pg, 'action_list', pg, 'action_list_index', rows=rows)
+                sequences_panel.template_list('PSA_UL_export_sequences', '', pg, 'action_list', pg, 'action_list_index', rows=rows)
             elif pg.sequence_source == 'TIMELINE_MARKERS':
                 rows = max(3, min(len(pg.marker_list), 10))
-            layout.template_list('PSA_UL_export_sequences', '', pg, 'marker_list', pg, 'marker_list_index', rows=rows)
+                sequences_panel.template_list('PSA_UL_export_sequences', '', pg, 'marker_list', pg, 'marker_list_index', rows=rows)
             elif pg.sequence_source == 'NLA_TRACK_STRIPS':
                 rows = max(3, min(len(pg.nla_strip_list), 10))
-            layout.template_list('PSA_UL_export_sequences', '', pg, 'nla_strip_list', pg, 'nla_strip_list_index', rows=rows)
+                sequences_panel.template_list('PSA_UL_export_sequences', '', pg, 'nla_strip_list', pg, 'nla_strip_list_index', rows=rows)
 
-        col = layout.column()
-        col.use_property_split = True
-        col.use_property_decorate = False
-        col.prop(pg, 'sequence_name_prefix')
-        col.prop(pg, 'sequence_name_suffix')
+            flow = sequences_panel.grid_flow()
+            flow.use_property_split = True
+            flow.use_property_decorate = False
+            flow.prop(pg, 'sequence_name_prefix', text='Name Prefix')
+            flow.prop(pg, 'sequence_name_suffix')
 
             # Determine if there is going to be a naming conflict and display an error, if so.
             selected_items = [x for x in pg.action_list if x.is_selected]
@@ -286,27 +292,41 @@ class PSA_OT_export(Operator, ExportHelper):
                     layout.label(text=f'Duplicate action: {action_name}', icon='ERROR')
                     break
 
-        layout.separator()
+            # FPS
+            flow.prop(pg, 'fps_source')
+            if pg.fps_source == 'CUSTOM':
+                flow.prop(pg, 'fps_custom', text='Custom')
 
         # BONES
-        row = layout.row(align=True)
+        bones_header, bones_panel = layout.panel('Bones', default_closed=False)
+        bones_header.label(text='Bones', icon='BONE_DATA')
+        if bones_panel:
+            row = bones_panel.row(align=True)
             row.prop(pg, 'bone_filter_mode', text='Bones')
 
             if pg.bone_filter_mode == 'BONE_COLLECTIONS':
-            row = layout.row(align=True)
+                row = bones_panel.row(align=True)
                 row.label(text='Select')
                 row.operator(PSA_OT_export_bone_collections_select_all.bl_idname, text='All', icon='CHECKBOX_HLT')
                 row.operator(PSA_OT_export_bone_collections_deselect_all.bl_idname, text='None', icon='CHECKBOX_DEHLT')
                 rows = max(3, min(len(pg.bone_collection_list), 10))
-            layout.template_list('PSX_UL_bone_collection_list', '', pg, 'bone_collection_list', pg, 'bone_collection_list_index',
+                bones_panel.template_list('PSX_UL_bone_collection_list', '', pg, 'bone_collection_list', pg, 'bone_collection_list_index',
                                      rows=rows)
 
-        layout.prop(pg, 'should_enforce_bone_name_restrictions')
+            flow = bones_panel.grid_flow()
+            flow.use_property_split = True
+            flow.use_property_decorate = False
+            flow.prop(pg, 'should_enforce_bone_name_restrictions')
 
-        layout.separator()
+        # ADVANCED
+        advanced_header, advanced_panel = layout.panel('Advanced', default_closed=False)
+        advanced_header.label(text='Advanced')
 
-        # ROOT MOTION
-        layout.prop(pg, 'root_motion', text='Root Motion')
+        if advanced_panel:
+            flow = advanced_panel.grid_flow()
+            flow.use_property_split = True
+            flow.use_property_decorate = False
+            flow.prop(pg, 'root_motion', text='Root Motion')
 
     @classmethod
     def _check_context(cls, context):
@@ -391,6 +411,8 @@ 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
@@ -124,7 +125,7 @@ class PSA_PG_export(PropertyGroup):
         description='',
         items=(
             ('SCENE', 'Scene', '', 'SCENE_DATA', 0),
-            ('ACTION_METADATA', 'Action Metadata', 'The frame rate will be determined by action\'s FPS property found in the PSA Export panel.\n\nIf the Sequence Source is Timeline Markers, the lowest value of all contributing actions will be used', 'PROPERTIES', 1),
+            ('ACTION_METADATA', 'Action Metadata', 'The frame rate will be determined by action\'s FPS property found in the PSA Export panel.\n\nIf the Sequence Source is Timeline Markers, the lowest value of all contributing actions will be used', 'ACTION', 1),
             ('CUSTOM', 'Custom', '', 2)
         )
     )

io_scene_psk_psa/psa/import_/operators.py

@@ -1,8 +1,9 @@
 import os
 from pathlib import Path
+from typing import List
 
-from bpy.props import StringProperty
-from bpy.types import Operator, Event, Context, FileHandler
+from bpy.props import StringProperty, CollectionProperty
+from bpy.types import Operator, Event, Context, FileHandler, OperatorFileListElement, Object
 from bpy_extras.io_utils import ImportHelper
 
 from .properties import get_visible_sequences
@@ -108,11 +109,99 @@ def load_psa_file(context, filepath: str):
         pg.psa_error = str(e)
 
 
-
 def on_psa_file_path_updated(cls, context):
     load_psa_file(context, cls.filepath)
 
 
+class PSA_OT_import_multiple(Operator):
+    bl_idname = 'psa_import.import_multiple'
+    bl_label = 'Import PSA'
+    bl_description = 'Import multiple PSA files'
+    bl_options = {'INTERNAL', 'UNDO'}
+
+    directory: StringProperty(subtype='FILE_PATH', options={'SKIP_SAVE', 'HIDDEN'})
+    files: CollectionProperty(type=OperatorFileListElement, options={'SKIP_SAVE', 'HIDDEN'})
+
+
+
+    def execute(self, context):
+        pg = getattr(context.scene, 'psa_import')
+        warnings = []
+
+        for file in self.files:
+            psa_path = os.path.join(self.directory, file.name)
+            psa_reader = PsaReader(psa_path)
+            sequence_names = psa_reader.sequences.keys()
+
+            result = _import_psa(context, pg, psa_path, sequence_names, context.view_layer.objects.active)
+            result.warnings.extend(warnings)
+
+        if len(result.warnings) > 0:
+            message = f'Imported {len(sequence_names)} action(s) with {len(result.warnings)} warning(s)\n'
+            self.report({'INFO'}, message)
+            for warning in result.warnings:
+                self.report({'WARNING'}, warning)
+
+        self.report({'INFO'}, f'Imported {len(sequence_names)} action(s)')
+
+        return {'FINISHED'}
+
+    def invoke(self, context: Context, event):
+        # Make sure the selected object is an armature.
+        active_object = context.view_layer.objects.active
+        if active_object is None or active_object.type != 'ARMATURE':
+            self.report({'ERROR_INVALID_CONTEXT'}, 'The active object must be an armature')
+            return {'CANCELLED'}
+
+        # Show the import operator properties in a pop-up dialog (do not use the file selector).
+        context.window_manager.invoke_props_dialog(self)
+        return {'RUNNING_MODAL'}
+
+    def draw(self, context):
+        layout = self.layout
+        pg = getattr(context.scene, 'psa_import')
+        draw_psa_import_options_no_panels(layout, pg)
+
+
+def _import_psa(context,
+                pg,
+                filepath: str,
+                sequence_names: List[str],
+                armature_object: Object
+                ):
+    options = PsaImportOptions()
+    options.sequence_names = sequence_names
+    options.should_use_fake_user = pg.should_use_fake_user
+    options.should_stash = pg.should_stash
+    options.action_name_prefix = pg.action_name_prefix if pg.should_use_action_name_prefix else ''
+    options.should_overwrite = pg.should_overwrite
+    options.should_write_metadata = pg.should_write_metadata
+    options.should_write_keyframes = pg.should_write_keyframes
+    options.should_convert_to_samples = pg.should_convert_to_samples
+    options.bone_mapping_mode = pg.bone_mapping_mode
+    options.fps_source = pg.fps_source
+    options.fps_custom = pg.fps_custom
+    options.translation_scale = pg.translation_scale
+
+    warnings = []
+
+    if options.should_use_config_file:
+        # Read the PSA config file if it exists.
+        config_path = Path(filepath).with_suffix('.config')
+        if config_path.exists():
+            try:
+                options.psa_config = read_psa_config(sequence_names, str(config_path))
+            except Exception as e:
+                warnings.append(f'Failed to read PSA config file: {e}')
+
+    psa_reader = PsaReader(filepath)
+
+    result = import_psa(context, psa_reader, armature_object, options)
+    result.warnings.extend(warnings)
+
+    return result
+
+
 class PSA_OT_import(Operator, ImportHelper):
     bl_idname = 'psa_import.import'
     bl_label = 'Import'
@@ -138,36 +227,13 @@ class PSA_OT_import(Operator, ImportHelper):
 
     def execute(self, context):
         pg = getattr(context.scene, 'psa_import')
-        psa_reader = PsaReader(self.filepath)
         sequence_names = [x.action_name for x in pg.sequence_list if x.is_selected]
 
         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
-        options.should_stash = pg.should_stash
-        options.action_name_prefix = pg.action_name_prefix if pg.should_use_action_name_prefix else ''
-        options.should_overwrite = pg.should_overwrite
-        options.should_write_metadata = pg.should_write_metadata
-        options.should_write_keyframes = pg.should_write_keyframes
-        options.should_convert_to_samples = pg.should_convert_to_samples
-        options.bone_mapping_mode = pg.bone_mapping_mode
-        options.fps_source = pg.fps_source
-        options.fps_custom = pg.fps_custom
-
-        if options.should_use_config_file:
-            # Read the PSA config file if it exists.
-            config_path = Path(self.filepath).with_suffix('.config')
-            if config_path.exists():
-                try:
-                    options.psa_config = read_psa_config(psa_reader, str(config_path))
-                except Exception as e:
-                    self.report({'WARNING'}, f'Failed to read PSA config file: {e}')
-
-        result = import_psa(context, psa_reader, context.view_layer.objects.active, options)
+        result = _import_psa(context, pg, self.filepath, sequence_names, context.view_layer.objects.active)
 
         if len(result.warnings) > 0:
             message = f'Imported {len(sequence_names)} action(s) with {len(result.warnings)} warning(s)\n'
@@ -249,6 +315,11 @@ class PSA_OT_import(Operator, ImportHelper):
             col.use_property_decorate = False
             col.prop(pg, 'bone_mapping_mode')
 
+            col = advanced_panel.column()
+            col.use_property_split = True
+            col.use_property_decorate = False
+            col.prop(pg, 'translation_scale', text='Translation Scale')
+
             col = advanced_panel.column(heading='Options')
             col.use_property_split = True
             col.use_property_decorate = False
@@ -257,10 +328,49 @@ class PSA_OT_import(Operator, ImportHelper):
             col.prop(pg, 'should_use_config_file')
 
 
+def draw_psa_import_options_no_panels(layout, pg):
+    col = layout.column(heading='Sequences')
+    col.use_property_split = True
+    col.use_property_decorate = False
+    col.prop(pg, 'fps_source')
+    if pg.fps_source == 'CUSTOM':
+        col.prop(pg, 'fps_custom')
+    col.prop(pg, 'should_overwrite')
+    col.prop(pg, 'should_use_action_name_prefix')
+    if pg.should_use_action_name_prefix:
+        col.prop(pg, 'action_name_prefix')
+
+    col = layout.column(heading='Write')
+    col.use_property_split = True
+    col.use_property_decorate = False
+    col.prop(pg, 'should_write_keyframes')
+    col.prop(pg, 'should_write_metadata')
+
+    if pg.should_write_keyframes:
+        col = col.column(heading='Keyframes')
+        col.use_property_split = True
+        col.use_property_decorate = False
+        col.prop(pg, 'should_convert_to_samples')
+
+    col = layout.column()
+    col.use_property_split = True
+    col.use_property_decorate = False
+    col.prop(pg, 'bone_mapping_mode')
+    col.prop(pg, 'translation_scale')
+
+    col = layout.column(heading='Options')
+    col.use_property_split = True
+    col.use_property_decorate = False
+    col.prop(pg, 'should_use_fake_user')
+    col.prop(pg, 'should_stash')
+    col.prop(pg, 'should_use_config_file')
+
+
 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_import_operator = 'psa_import.import_multiple'
+    bl_export_operator = 'psa_export.export'
     bl_file_extensions = '.psa'
 
     @classmethod
@@ -273,5 +383,6 @@ classes = (
     PSA_OT_import_sequences_deselect_all,
     PSA_OT_import_sequences_from_text,
     PSA_OT_import,
+    PSA_OT_import_multiple,
     PSA_FH_import,
 )

io_scene_psk_psa/psa/import_/properties.py

@@ -89,6 +89,25 @@ class PSA_PG_import(PropertyGroup):
         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,
+    )
+    translation_scale: FloatProperty(
+        name='Translation Scale',
+        default=1.0,
+        description='Scale factor for bone translation values. Use this when the scale of the armature does not match the PSA file'
+    )
 
 
 def filter_sequences(pg: PSA_PG_import, sequences) -> List[int]:

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)
@@ -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

@@ -24,6 +24,7 @@ class PsaImportOptions(object):
         self.bone_mapping_mode = 'CASE_INSENSITIVE'
         self.fps_source = 'SEQUENCE'
         self.fps_custom: float = 30.0
+        self.translation_scale: float = 1.0
         self.should_use_config_file = True
         self.psa_config: PsaConfig = PsaConfig()
 
@@ -88,6 +89,7 @@ def _get_sample_frame_times(source_frame_count: int, frame_step: float) -> typin
         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.
@@ -271,6 +273,10 @@ def import_psa(context: Context, psa_reader: PsaReader, armature_object: Object,
             # Read the sequence data matrix from the PSA.
             sequence_data_matrix = psa_reader.read_sequence_data_matrix(sequence_name)
 
+            if options.translation_scale != 1.0:
+                # Scale the translation data.
+                sequence_data_matrix[:, :, 4:] *= options.translation_scale
+
             # Convert the sequence's data from world-space to local-space.
             for bone_index, import_bone in enumerate(import_bones):
                 if import_bone is None:

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

@@ -3,11 +3,11 @@ from typing import Optional
 import bmesh
 import bpy
 import numpy as np
-from bpy.types import Armature, Material
+from bpy.types import Armature, Material, Collection, Context
 
 from .data import *
 from .properties import triangle_type_and_bit_flags_to_poly_flags
-from ..helpers import *
+from ..shared.helpers import *
 
 
 class PskInputObjects(object):
@@ -20,32 +20,31 @@ class PskBuildOptions(object):
     def __init__(self):
         self.bone_filter_mode = 'ALL'
         self.bone_collection_indices: List[int] = []
-        self.use_raw_mesh_data = True
+        self.object_eval_state = 'EVALUATED'
         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')
+def get_mesh_objects_for_collection(collection: Collection, should_exclude_hidden_meshes: bool = True):
+    for obj in collection.all_objects:
+        if obj.type != 'MESH':
+            continue
+        if should_exclude_hidden_meshes and obj.visible_get() is False:
+            continue
+        yield obj
 
-    input_objects.mesh_objects = context.view_layer.objects.selected
 
-    if len(input_objects.mesh_objects) == 0:
-        raise RuntimeError('At least one mesh must be selected')
+def get_mesh_objects_for_context(context: Context):
+    for obj in context.view_layer.objects.selected:
+        if obj.type == 'MESH':
+            yield obj
 
-    for mesh_object in input_objects.mesh_objects:
-        if len(mesh_object.data.materials) == 0:
-            raise RuntimeError(f'Mesh "{mesh_object.name}" must have at least one material')
 
-    # Ensure that there are either no armature modifiers (static mesh)
-    # or that there is exactly one armature modifier object shared between
-    # all selected meshes
+def get_armature_for_mesh_objects(mesh_objects: List[Object]) -> Optional[Object]:
+    # Ensure that there are either no armature modifiers (static mesh) or that there is exactly one armature modifier
+    # object shared between all meshes.
     armature_modifier_objects = set()
-
-    for mesh_object in input_objects.mesh_objects:
+    for mesh_object in mesh_objects:
         modifiers = [x for x in mesh_object.modifiers if x.type == 'ARMATURE']
         if len(modifiers) == 0:
             continue
@@ -55,21 +54,46 @@ def get_psk_input_objects(context) -> PskInputObjects:
 
     if len(armature_modifier_objects) > 1:
         armature_modifier_names = [x.name for x in armature_modifier_objects]
-        raise RuntimeError(f'All selected meshes must have the same armature modifier, encountered {len(armature_modifier_names)} ({", ".join(armature_modifier_names)})')
+        raise RuntimeError(
+            f'All meshes must have the same armature modifier, encountered {len(armature_modifier_names)} ({", ".join(armature_modifier_names)})')
     elif len(armature_modifier_objects) == 1:
-        input_objects.armature_object = list(armature_modifier_objects)[0]
+        return list(armature_modifier_objects)[0]
+    else:
+        return None
+
+
+def _get_psk_input_objects(mesh_objects: List[Object]) -> PskInputObjects:
+    if len(mesh_objects) == 0:
+        raise RuntimeError('At least one mesh must be selected')
+
+    for mesh_object in mesh_objects:
+        if len(mesh_object.data.materials) == 0:
+            raise RuntimeError(f'Mesh "{mesh_object.name}" must have at least one material')
+
+    input_objects = PskInputObjects()
+    input_objects.mesh_objects = mesh_objects
+    input_objects.armature_object = get_armature_for_mesh_objects(mesh_objects)
 
     return input_objects
 
 
+def get_psk_input_objects_for_context(context: Context) -> PskInputObjects:
+    mesh_objects = list(get_mesh_objects_for_context(context))
+    return _get_psk_input_objects(mesh_objects)
+
+
+def get_psk_input_objects_for_collection(collection: Collection, should_exclude_hidden_meshes: bool = True) -> PskInputObjects:
+    mesh_objects = list(get_mesh_objects_for_collection(collection, should_exclude_hidden_meshes))
+    return _get_psk_input_objects(mesh_objects)
+
+
 class PskBuildResult(object):
     def __init__(self):
         self.psk = None
         self.warnings: List[str] = []
 
 
-def build_psk(context, options: PskBuildOptions) -> PskBuildResult:
-    input_objects = get_psk_input_objects(context)
+def build_psk(context, input_objects: PskInputObjects, options: PskBuildOptions) -> PskBuildResult:
     armature_object: bpy.types.Object = input_objects.armature_object
 
     result = PskBuildResult()
@@ -162,10 +186,11 @@ def build_psk(context, options: PskBuildOptions) -> PskBuildResult:
         material_indices = [material_names.index(material_slot.material.name) for material_slot in input_mesh_object.material_slots]
 
         # MESH DATA
-        if options.use_raw_mesh_data:
+        match options.object_eval_state:
+            case 'ORIGINAL':
                 mesh_object = input_mesh_object
                 mesh_data = input_mesh_object.data
-        else:
+            case 'EVALUATED':
                 # Create a copy of the mesh object after non-armature modifiers are applied.
 
                 # Temporarily force the armature into the rest position.
@@ -289,6 +314,12 @@ def build_psk(context, options: PskBuildOptions) -> PskBuildResult:
                                 break
                             except ValueError:
                                 bone = bone.parent
+
+            # Keep track of which vertices have been assigned weights.
+            # The ones that have not been assigned weights will be assigned to the root bone.
+            # Without this, some older versions of UnrealEd may have corrupted meshes.
+            vertices_assigned_weights = np.full(len(mesh_data.vertices), False)
+
             for vertex_group_index, vertex_group in enumerate(mesh_object.vertex_groups):
                 if vertex_group_index not in vertex_group_bone_indices:
                     # Vertex group has no associated bone, skip it.
@@ -306,8 +337,18 @@ def build_psk(context, options: PskBuildOptions) -> PskBuildResult:
                     w.point_index = vertex_offset + vertex_index
                     w.weight = weight
                     psk.weights.append(w)
+                    vertices_assigned_weights[vertex_index] = True
 
-        if not options.use_raw_mesh_data:
+            # Assign vertices that have not been assigned weights to the root bone.
+            for vertex_index, assigned in enumerate(vertices_assigned_weights):
+                if not assigned:
+                    w = Psk.Weight()
+                    w.bone_index = 0
+                    w.point_index = vertex_offset + vertex_index
+                    w.weight = 1.0
+                    psk.weights.append(w)
+
+        if options.object_eval_state == 'EVALUATED':
             bpy.data.objects.remove(mesh_object)
             bpy.data.meshes.remove(mesh_data)
             del mesh_data

io_scene_psk_psa/psk/data.py

@@ -1,6 +1,6 @@
 from typing import List
 
-from ..data import *
+from ..shared.data import *
 
 
 class Psk(object):

io_scene_psk_psa/psk/export/operators.py

@@ -1,35 +1,40 @@
-from bpy.props import StringProperty
-from bpy.types import Operator
+from typing import List
+
+import bpy
+from bpy.props import StringProperty, BoolProperty, EnumProperty
+from bpy.types import Operator, Context, Object
 from bpy_extras.io_utils import ExportHelper
 
-from ..builder import build_psk, PskBuildOptions, get_psk_input_objects
+from .properties import object_eval_state_items
+from ..builder import build_psk, PskBuildOptions, get_psk_input_objects_for_context, \
+    get_psk_input_objects_for_collection
 from ..writer import write_psk
-from ...helpers import populate_bone_collection_list
+from ...shared.helpers import populate_bone_collection_list
 
 
 def is_bone_filter_mode_item_available(context, identifier):
-    input_objects = get_psk_input_objects(context)
+    input_objects = get_psk_input_objects_for_context(context)
     armature_object = input_objects.armature_object
     if identifier == 'BONE_COLLECTIONS':
         if armature_object is None or armature_object.data is None or len(armature_object.data.collections) == 0:
             return False
-    # else if... you can set up other conditions if you add more options
     return True
 
 
-def populate_material_list(mesh_objects, material_list):
-    material_list.clear()
-
+def get_materials_for_mesh_objects(mesh_objects: List[Object]):
     materials = []
     for mesh_object in mesh_objects:
         for i, material_slot in enumerate(mesh_object.material_slots):
             material = material_slot.material
-            # TODO: put this in the poll arg?
             if material is None:
                 raise RuntimeError('Material slot cannot be empty (index ' + str(i) + ')')
             if material not in materials:
                 materials.append(material)
+    return materials
 
+def populate_material_list(mesh_objects, material_list):
+    materials =  get_materials_for_mesh_objects(mesh_objects)
+    material_list.clear()
     for index, material in enumerate(materials):
         m = material_list.add()
         m.material = material
@@ -72,11 +77,95 @@ class PSK_OT_material_list_move_down(Operator):
         return {'FINISHED'}
 
 
+class PSK_OT_export_collection(Operator, ExportHelper):
+    bl_idname = 'export.psk_collection'
+    bl_label = 'Export'
+    bl_options = {'INTERNAL'}
+    filename_ext = '.psk'
+    filter_glob: StringProperty(default='*.psk', options={'HIDDEN'})
+    filepath: StringProperty(
+        name='File Path',
+        description='File path used for exporting the PSK file',
+        maxlen=1024,
+        default='',
+        subtype='FILE_PATH')
+    collection: StringProperty(options={'HIDDEN'})
+
+    object_eval_state: EnumProperty(
+        items=object_eval_state_items,
+        name='Object Evaluation State',
+        default='EVALUATED'
+    )
+    should_enforce_bone_name_restrictions: BoolProperty(
+        default=False,
+        name='Enforce Bone Name Restrictions',
+        description='Enforce that bone names must only contain letters, numbers, spaces, hyphens and underscores.\n\n'
+                    'Depending on the engine, improper bone names might not be referenced correctly by scripts'
+    )
+    should_exclude_hidden_meshes: BoolProperty(
+        default=True,
+        name='Visible Only',
+        description='Export only visible meshes'
+    )
+
+    def execute(self, context):
+        collection = bpy.data.collections.get(self.collection)
+
+        try:
+            input_objects = get_psk_input_objects_for_collection(collection, self.should_exclude_hidden_meshes)
+        except RuntimeError as e:
+            self.report({'ERROR_INVALID_CONTEXT'}, str(e))
+            return {'CANCELLED'}
+
+        options = PskBuildOptions()
+        options.bone_filter_mode = 'ALL'
+        options.object_eval_state = self.object_eval_state
+        options.materials = get_materials_for_mesh_objects(input_objects.mesh_objects)
+        options.should_enforce_bone_name_restrictions = self.should_enforce_bone_name_restrictions
+
+        try:
+            result = build_psk(context, input_objects, options)
+            for warning in result.warnings:
+                self.report({'WARNING'}, warning)
+            write_psk(result.psk, self.filepath)
+            if len(result.warnings) > 0:
+                self.report({'WARNING'}, f'PSK export successful with {len(result.warnings)} warnings')
+            else:
+                self.report({'INFO'}, f'PSK export successful')
+        except RuntimeError as e:
+            self.report({'ERROR_INVALID_CONTEXT'}, str(e))
+            return {'CANCELLED'}
+
+        return {'FINISHED'}
+
+    def draw(self, context: Context):
+        layout = self.layout
+
+        # MESH
+        mesh_header, mesh_panel = layout.panel('Mesh', default_closed=False)
+        mesh_header.label(text='Mesh', icon='MESH_DATA')
+        if mesh_panel:
+            flow = mesh_panel.grid_flow(row_major=True)
+            flow.use_property_split = True
+            flow.use_property_decorate = False
+            flow.prop(self, 'object_eval_state', text='Data')
+            flow.prop(self, 'should_exclude_hidden_meshes')
+
+        # BONES
+        bones_header, bones_panel = layout.panel('Bones', default_closed=False)
+        bones_header.label(text='Bones', icon='BONE_DATA')
+        if bones_panel:
+            flow = bones_panel.grid_flow(row_major=True)
+            flow.use_property_split = True
+            flow.use_property_decorate = False
+            flow.prop(self, 'should_enforce_bone_name_restrictions')
+
+
 class PSK_OT_export(Operator, ExportHelper):
     bl_idname = 'export.psk'
     bl_label = 'Export'
     bl_options = {'INTERNAL', 'UNDO'}
-    __doc__ = 'Export mesh and armature to PSK'
+    bl_description = 'Export mesh and armature to PSK'
     filename_ext = '.psk'
     filter_glob: StringProperty(default='*.psk', options={'HIDDEN'})
 
@@ -88,7 +177,7 @@ class PSK_OT_export(Operator, ExportHelper):
 
     def invoke(self, context, event):
         try:
-            input_objects = get_psk_input_objects(context)
+            input_objects = get_psk_input_objects_for_context(context)
         except RuntimeError as e:
             self.report({'ERROR_INVALID_CONTEXT'}, str(e))
             return {'CANCELLED'}
@@ -110,7 +199,7 @@ class PSK_OT_export(Operator, ExportHelper):
     @classmethod
     def poll(cls, context):
         try:
-            get_psk_input_objects(context)
+            get_psk_input_objects_for_context(context)
         except RuntimeError as e:
             cls.poll_message_set(str(e))
             return False
@@ -118,18 +207,24 @@ class PSK_OT_export(Operator, ExportHelper):
 
     def draw(self, context):
         layout = self.layout
+
         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('Mesh', default_closed=False)
+        mesh_header.label(text='Mesh', icon='MESH_DATA')
+        if mesh_panel:
+            flow = mesh_panel.grid_flow(row_major=True)
+            flow.use_property_split = True
+            flow.use_property_decorate = False
+            flow.prop(pg, 'object_eval_state', text='Data')
 
         # BONES
-        box = layout.box()
-        box.label(text='Bones', icon='BONE_DATA')
+        bones_header, bones_panel = layout.panel('Bones', default_closed=False)
+        bones_header.label(text='Bones', icon='BONE_DATA')
+        if bones_panel:
             bone_filter_mode_items = pg.bl_rna.properties['bone_filter_mode'].enum_items_static
-        row = 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 +232,17 @@ 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('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)
@@ -154,16 +250,19 @@ class PSK_OT_export(Operator, ExportHelper):
             col.operator(PSK_OT_material_list_move_down.bl_idname, text='', icon='TRIA_DOWN')
 
     def execute(self, context):
-        pg = context.scene.psk_export
+        pg = getattr(context.scene, 'psk_export')
+
+        input_objects = get_psk_input_objects_for_context(context)
+
         options = PskBuildOptions()
         options.bone_filter_mode = pg.bone_filter_mode
         options.bone_collection_indices = [x.index for x in pg.bone_collection_list if x.is_selected]
-        options.use_raw_mesh_data = pg.use_raw_mesh_data
+        options.object_eval_state = pg.object_eval_state
         options.materials = [m.material for m in pg.material_list]
         options.should_enforce_bone_name_restrictions = pg.should_enforce_bone_name_restrictions
         
         try:
-            result = build_psk(context, options)
+            result = build_psk(context, input_objects, options)
             for warning in result.warnings:
                 self.report({'WARNING'}, warning)
             write_psk(result.psk, self.filepath)
@@ -182,4 +281,5 @@ classes = (
     PSK_OT_material_list_move_up,
     PSK_OT_material_list_move_down,
     PSK_OT_export,
+    PSK_OT_export_collection,
 )

io_scene_psk_psa/psk/export/properties.py

@@ -1,10 +1,16 @@
 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()
 
+
+object_eval_state_items = (
+    ('EVALUATED', 'Evaluated', 'Use data from fully evaluated object'),
+    ('ORIGINAL', 'Original', 'Use data from original object with no modifiers applied'),
+)
+
 class PSK_PG_material_list_item(PropertyGroup):
     material: PointerProperty(type=Material)
     index: IntProperty()
@@ -23,7 +29,11 @@ class PSK_PG_export(PropertyGroup):
     )
     bone_collection_list: CollectionProperty(type=PSX_PG_bone_collection_list_item)
     bone_collection_list_index: IntProperty(default=0)
-    use_raw_mesh_data: BoolProperty(default=False, name='Raw Mesh Data', description='No modifiers will be evaluated as part of the exported mesh')
+    object_eval_state: EnumProperty(
+        items=object_eval_state_items,
+        name='Object Evaluation State',
+        default='EVALUATED'
+    )
     material_list: CollectionProperty(type=PSK_PG_material_list_item)
     material_list_index: IntProperty(default=0)
     should_enforce_bone_name_restrictions: BoolProperty(

io_scene_psk_psa/psk/import_/operators.py

@@ -13,8 +13,9 @@ empty_set = set()
 
 class PSK_FH_import(FileHandler):
     bl_idname = 'PSK_FH_import'
-    bl_label = 'File handler for Unreal PSK/PSKX import'
+    bl_label = 'Unreal PSK'
     bl_import_operator = 'import_scene.psk'
+    bl_export_operator = 'export.psk_collection'
     bl_file_extensions = '.psk;.pskx'
 
     @classmethod
@@ -26,7 +27,7 @@ class PSK_OT_import(Operator, ImportHelper):
     bl_idname = 'import_scene.psk'
     bl_label = 'Import'
     bl_options = {'INTERNAL', 'UNDO', 'PRESET'}
-    __doc__ = 'Load a PSK file'
+    bl_description = 'Import a PSK file'
     filename_ext = '.psk'
     filter_glob: StringProperty(default='*.psk;*.pskx', options={'HIDDEN'})
     filepath: StringProperty(
@@ -101,6 +102,12 @@ class PSK_OT_import(Operator, ImportHelper):
         default=1.0,
         soft_min=0.0,
     )
+    bdk_repository_id: StringProperty(
+        name='BDK Repository ID',
+        default='',
+        options=empty_set,
+        description='The ID of the BDK repository to use for loading materials'
+    )
 
     def execute(self, context):
         psk = read_psk(self.filepath)
@@ -118,6 +125,9 @@ class PSK_OT_import(Operator, ImportHelper):
         options.should_import_shape_keys = self.should_import_shape_keys
         options.scale = self.scale
 
+        if self.bdk_repository_id:
+            options.bdk_repository_id = self.bdk_repository_id
+
         if not options.should_import_mesh and not options.should_import_skeleton:
             self.report({'ERROR'}, 'Nothing to import')
             return {'CANCELLED'}

io_scene_psk_psa/psk/importer.py

@@ -8,7 +8,7 @@ from mathutils import Quaternion, Vector, Matrix
 
 from .data import Psk
 from .properties import poly_flags_to_triangle_type_and_bit_flags
-from ..helpers import rgb_to_srgb, is_bdk_addon_loaded
+from ..shared.helpers import rgb_to_srgb, is_bdk_addon_loaded
 
 
 class PskImportOptions:
@@ -25,6 +25,7 @@ class PskImportOptions:
         self.bone_length = 1.0
         self.should_import_materials = True
         self.scale = 1.0
+        self.bdk_repository_id = None
 
 
 class ImportBone:
@@ -130,7 +131,8 @@ def import_psk(psk: Psk, context, options: PskImportOptions) -> PskImportResult:
                     # Material does not yet exist, and we have the BDK addon installed.
                     # Attempt to load it using BDK addon's operator.
                     material_reference = psk.material_references[material_index]
-                    if material_reference and bpy.ops.bdk.link_material(reference=material_reference) == {'FINISHED'}:
+                    repository_id = options.bdk_repository_id if options.bdk_repository_id is not None else ''
+                    if material_reference and bpy.ops.bdk.link_material(reference=material_reference, repository_id=repository_id) == {'FINISHED'}:
                         material = bpy.data.materials[material_name]
                 else:
                     # Just create a blank material.
@@ -171,7 +173,7 @@ def import_psk(psk: Psk, context, options: PskImportOptions) -> PskImportResult:
 
         # TEXTURE COORDINATES
         uv_layer_data_index = 0
-        uv_layer = mesh_data.uv_layers.new(name='VTXW0000')
+        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

io_scene_psk_psa/psk/writer.py

@@ -1,8 +1,9 @@
+import os
 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
@@ -34,6 +35,9 @@ def write_psk(psk: Psk, path: str):
     elif len(psk.bones) == 0:
         raise RuntimeError(f'At least one bone must be marked for export')
 
+    # Make the directory for the file if it doesn't exist.
+    os.makedirs(os.path.dirname(path), exist_ok=True)
+
     with open(path, 'wb') as fp:
         _write_section(fp, b'ACTRHEAD')
         _write_section(fp, b'PNTS0000', Vector3, psk.points)

io_scene_psk_psa/shared/helpers.py

@@ -2,7 +2,6 @@ import re
 import typing
 from typing import List, Iterable
 
-import addon_utils
 import bpy.types
 from bpy.types import NlaStrip, Object, AnimData
 
@@ -30,12 +29,12 @@ def get_nla_strips_in_frame_range(animation_data: AnimData, frame_min: float, fr
 
 
 def populate_bone_collection_list(armature_object: Object, bone_collection_list: bpy.props.CollectionProperty) -> None:
-    '''
+    """
     Updates the bone collections collection.
 
     Bone collection selections are preserved between updates unless none of the groups were previously selected;
     otherwise, all collections are selected by default.
-    '''
+    """
     has_selected_collections = any([g.is_selected for g in bone_collection_list])
     unassigned_collection_is_selected, selected_assigned_collection_names = True, []
 
@@ -84,7 +83,7 @@ def check_bone_names(bone_names: Iterable[str]):
 
 
 def get_export_bone_names(armature_object: Object, bone_filter_mode: str, bone_collection_indices: List[int]) -> List[str]:
-    '''
+    """
     Returns a sorted list of bone indices that should be exported for the given bone filter mode and bone collections.
 
     Note that the ancestors of bones within the bone collections will also be present in the returned list.
@@ -93,7 +92,7 @@ def get_export_bone_names(armature_object: Object, bone_filter_mode: str, bone_c
     :param bone_filter_mode: One of ['ALL', 'BONE_COLLECTIONS']
     :param bone_collection_indices: List of bone collection indices to be exported.
     :return: A sorted list of bone indices that should be exported.
-    '''
+    """
     if armature_object is None or armature_object.type != 'ARMATURE':
         raise ValueError('An armature object must be supplied')
 
@@ -164,5 +163,5 @@ def get_export_bone_names(armature_object: Object, bone_filter_mode: str, bone_c
     return bone_names
 
 
-def is_bdk_addon_loaded():
-    return addon_utils.check('bdk_addon')[1]
+def is_bdk_addon_loaded() -> bool:
+    return bpy.ops.bdk is not None and bpy.ops.bdk.link_material is not None