Initial commit for work to fix the multi-armature workflow

Some very old PSKs and PSAs have trailing spaces in the bone names instead of padding the buffer with null bytes.

Trailing whitespace will now be ignored by default to maximize compatibility.

README.md

@@ -7,6 +7,11 @@ This Blender addon allows you to import and export meshes and animations to and
 
 This software is licensed under the [GPLv3](https://www.gnu.org/licenses/gpl-3.0.html) license.
 
+# Installation
+For Blender 4.2 and higher, download the latest version from the [Blender Extensions](https://extensions.blender.org/add-ons/io-scene-psk-psa/) platform.
+
+For Blender 4.1 and lower, see [Legacy Compatibility](#legacy-compatibility).
+
 # Features
 * Full PSK/PSA import and export capabilities.
 * Non-standard file section data (.pskx) is supported for import only (vertex normals, extra UV channels, vertex colors, shape keys).
@@ -18,11 +23,6 @@ This software is licensed under the [GPLv3](https://www.gnu.org/licenses/gpl-3.0
 * Multiple armature objects can be exported to a single PSK or PSA file, allowing seamless use of [action slots](https://docs.blender.org/manual/en/latest/animation/actions.html#action-slots).
 * Support for exporting instance collections.
 
-# Installation
-For Blender 4.2 and higher, download the latest version from the [Blender Extensions](https://extensions.blender.org/add-ons/io-scene-psk-psa/) platform.
-
-For Blender 4.1 and lower, see [Legacy Compatibility](#legacy-compatibility).
-
 # Usage
 ## Exporting a PSK
 1. Select the mesh objects you wish to export.
@@ -71,15 +71,12 @@ There is a [pull request](https://github.com/gildor2/UEViewer/pull/277) to add s
 # 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 These versions are no longer maintained and may contain bugs that have been fixed in newer versions.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~~  |
-
+| Blender Version| Addon Version |
+|-|-|
+| [4.1](https://www.blender.org/download/releases/4-1/)        | [7.0.0](https://github.com/DarklightGames/io_scene_psk_psa/releases/tag/7.0.0) |
+| [4.0](https://www.blender.org/download/releases/4-0/)        | [6.2.1](https://github.com/DarklightGames/io_scene_psk_psa/releases/tag/6.2.1) |
+| [3.4 - 3.6](https://www.blender.org/download/lts/3-6/)       | [5.0.6](https://github.com/DarklightGames/io_scene_psk_psa/releases/tag/5.0.6) |
+| [2.93 - 3.3](https://www.blender.org/download/releases/3-3/) | [4.3.0](https://github.com/DarklightGames/io_scene_psk_psa/releases/tag/4.3.0) |
 
 # Testing
 To execute the automated tests, run:

io_scene_psk_psa/__init__.py

@@ -1,6 +1,41 @@
 from bpy.app.handlers import persistent
 
-if 'bpy' in locals():
+from .shared import data as shared_data, types as shared_types, helpers as shared_helpers
+from .shared import dfs as shared_dfs, ui as shared_ui
+from .psk import (
+    builder as psk_builder,
+    data as psk_data,
+    importer as psk_importer,
+    properties as psk_properties,
+    writer as psk_writer,
+)
+from .psk import reader as psk_reader, ui as psk_ui
+from .psk.export import (
+    operators as psk_export_operators,
+    properties as psk_export_properties,
+    ui as psk_export_ui,
+)
+from .psk.import_ import operators as psk_import_operators
+
+from .psa import (
+    config as psa_config,
+    data as psa_data,
+    writer as psa_writer,
+    reader as psa_reader,
+    builder as psa_builder,
+    importer as psa_importer,
+)
+from .psa.export import (
+    properties as psa_export_properties,
+    ui as psa_export_ui,
+    operators as psa_export_operators,
+)
+from .psa.import_ import operators as psa_import_operators
+from .psa.import_ import ui as psa_import_ui, properties as psa_import_properties
+
+_needs_reload = 'bpy' in locals()
+
+if _needs_reload:
     import importlib
 
     importlib.reload(shared_data)
@@ -33,58 +68,10 @@ if 'bpy' in locals():
     importlib.reload(psa_import_properties)
     importlib.reload(psa_import_operators)
     importlib.reload(psa_import_ui)
-else:
-    from .shared import data as shared_data, types as shared_types, helpers as shared_helpers
-    from .shared import dfs as shared_dfs, ui as shared_ui
-    from .psk import (
-        builder as psk_builder,
-        data as psk_data,
-        importer as psk_importer,
-        properties as psk_properties,
-        writer as psk_writer,
-    )
-    from .psk import reader as psk_reader, ui as psk_ui
-    from .psk.export import (
-        operators as psk_export_operators,
-        properties as psk_export_properties,
-        ui as psk_export_ui,
-    )
-    from .psk.import_ import operators as psk_import_operators
-
-    from .psa import (
-        config as psa_config,
-        data as psa_data,
-        writer as psa_writer,
-        reader as psa_reader,
-        builder as psa_builder,
-        importer as psa_importer,
-    )
-    from .psa.export import (
-        properties as psa_export_properties,
-        ui as psa_export_ui,
-        operators as psa_export_operators,
-    )
-    from .psa.import_ import operators as psa_import_operators
-    from .psa.import_ import ui as psa_import_ui, properties as psa_import_properties
 
 import bpy
 from bpy.props import PointerProperty
 
-classes = shared_types.classes + \
-          shared_ui.classes + \
-          psk_properties.classes + \
-          psk_ui.classes + \
-          psk_import_operators.classes + \
-          psk_export_properties.classes + \
-          psk_export_operators.classes + \
-          psk_export_ui.classes + \
-          psa_export_properties.classes + \
-          psa_export_operators.classes + \
-          psa_export_ui.classes + \
-          psa_import_properties.classes + \
-          psa_import_operators.classes + \
-          psa_import_ui.classes
-
 
 def psk_export_menu_func(self, context):
     self.layout.operator(psk_export_operators.PSK_OT_export.bl_idname, text='Unreal PSK (.psk)')
@@ -102,9 +89,26 @@ def psa_import_menu_func(self, context):
     self.layout.operator(psa_import_operators.PSA_OT_import.bl_idname, text='Unreal PSA (.psa)')
 
 
+_modules = (
+    shared_types,
+    shared_ui,
+    psk_properties,
+    psk_ui,
+    psk_import_operators,
+    psk_export_properties,
+    psk_export_operators,
+    psk_export_ui,
+    psa_export_properties,
+    psa_export_operators,
+    psa_export_ui,
+    psa_import_properties,
+    psa_import_operators,
+    psa_import_ui
+)
+
 def register():
-    for cls in classes:
-        bpy.utils.register_class(cls)
+    for module in _modules:
+        module.register()
     bpy.types.TOPBAR_MT_file_export.append(psk_export_menu_func)
     bpy.types.TOPBAR_MT_file_import.append(psk_import_menu_func)
     bpy.types.TOPBAR_MT_file_export.append(psa_export_menu_func)
@@ -128,8 +132,8 @@ def unregister():
     bpy.types.TOPBAR_MT_file_import.remove(psk_import_menu_func)
     bpy.types.TOPBAR_MT_file_export.remove(psa_export_menu_func)
     bpy.types.TOPBAR_MT_file_import.remove(psa_import_menu_func)
-    for cls in reversed(classes):
-        bpy.utils.unregister_class(cls)
+    for module in reversed(_modules):
+        module.unregister()
 
 
 if __name__ == '__main__':

io_scene_psk_psa/blender_manifest.toml

@@ -1,13 +1,13 @@
 schema_version = "1.0.0"
 id = "io_scene_psk_psa"
-version = "8.1.2"
+version = "8.2.2"
 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"
+blender_version_min = "4.4.0"
 # Optional: maximum supported Blender version
 # blender_version_max = "5.1.0"
 license = [

io_scene_psk_psa/psa/builder.py

@@ -1,10 +1,10 @@
 from bpy.types import Action, AnimData, Context, Object, PoseBone
 
 from .data import Psa
-from typing import Dict, List, Optional, Tuple
+from typing import Dict, List, Optional, Tuple, Iterable
 from mathutils import Matrix, Quaternion, Vector
 
-from ..shared.helpers import create_psx_bones, get_coordinate_system_transform
+from ..shared.helpers import PsxBoneCollection, create_psx_bones, get_coordinate_system_transform
 
 
 class PsaBuildSequence:
@@ -14,8 +14,8 @@ class PsaBuildSequence:
             self.frame_start: int = 0
             self.frame_end: int = 0
 
-    def __init__(self, armature_object: Object, anim_data: AnimData):
-        self.armature_object = armature_object
+    def __init__(self, armature_objects: Iterable[Object], anim_data: AnimData):
+        self.armature_objects = list(armature_objects)
         self.anim_data = anim_data
         self.name: str = ''
         self.nla_state: PsaBuildSequence.NlaState = PsaBuildSequence.NlaState()
@@ -27,10 +27,9 @@ class PsaBuildSequence:
 class PsaBuildOptions:
     def __init__(self):
         self.armature_objects: List[Object] = []
-        self.animation_data: Optional[AnimData] = None
         self.sequences: List[PsaBuildSequence] = []
         self.bone_filter_mode: str = 'ALL'
-        self.bone_collection_indices: List[PsaBoneCollectionIndex] = []
+        self.bone_collection_indices: List[PsxBoneCollection] = []
         self.sequence_name_prefix: str = ''
         self.sequence_name_suffix: str = ''
         self.scale = 1.0
@@ -58,7 +57,7 @@ def _get_pose_bone_location_and_rotation(
 
     if is_false_root_bone:
         pose_bone_matrix = coordinate_system_transform
-    elif pose_bone.parent is not None:
+    elif pose_bone is not None and pose_bone.parent is not None:
         pose_bone_matrix = pose_bone.matrix
         pose_bone_parent_matrix = pose_bone.parent.matrix
         pose_bone_matrix = pose_bone_parent_matrix.inverted() @ pose_bone_matrix
@@ -103,8 +102,13 @@ def _get_pose_bone_location_and_rotation(
 
 
 def build_psa(context: Context, options: PsaBuildOptions) -> Psa:
+
+    assert context.scene
+    assert context.window_manager
+
     psa = Psa()
 
+    # TODO: move this OUT!
     armature_objects_for_bones = options.armature_objects
     if options.sequence_source == 'ACTIVE_ACTION' and len(options.armature_objects) >= 2:
         # Make sure that the data-block for all the selected armature objects is the same.
@@ -139,7 +143,7 @@ def build_psa(context: Context, options: PsaBuildOptions) -> Psa:
         export_sequence.name = export_sequence.name.strip()
 
     # Save each armature object's current action and frame so that we can restore the state once we are done.
-    saved_armature_object_actions = {o: o.animation_data.action for o in options.armature_objects}
+    saved_armature_object_actions = {o: o.animation_data.action if o.animation_data else None for o in options.armature_objects}
     saved_frame_current = context.scene.frame_current
 
     # Now build the PSA sequences.
@@ -181,10 +185,9 @@ def build_psa(context: Context, options: PsaBuildOptions) -> Psa:
 
         frame = float(frame_start)
         
-        # Link the action to the animation data and update view layer.
-        for armature_object in options.armature_objects:
-            armature_object.animation_data.action = export_sequence.nla_state.action
+        export_sequence.anim_data.action = export_sequence.nla_state.action
 
+        assert context.view_layer
         context.view_layer.update()
 
         def add_key(location: Vector, rotation: Quaternion):
@@ -208,7 +211,7 @@ def build_psa(context: Context, options: PsaBuildOptions) -> Psa:
         armature_scales: Dict[Object, Vector] = {}
 
         # Extract the scale from the world matrix of the evaluated armature object.
-        for armature_object in options.armature_objects:
+        for armature_object in export_sequence.armature_objects:
             evaluated_armature_object = armature_object.evaluated_get(context.evaluated_depsgraph_get())
             _, _, scale = evaluated_armature_object.matrix_world.decompose()
             scale *= options.scale
@@ -219,11 +222,13 @@ def build_psa(context: Context, options: PsaBuildOptions) -> Psa:
         # locations.
         export_bones: List[PsaExportBone] = []
 
+        # TODO: we need different behavior here if it's ACTIVE_ACTION
         for psx_bone, armature_object in psx_bone_create_result.bones:
             if armature_object is None:
                 export_bones.append(PsaExportBone(None, None, Vector((1.0, 1.0, 1.0))))
                 continue
 
+            assert armature_object.pose
             pose_bone = armature_object.pose.bones[psx_bone.name.decode('windows-1252')]
 
             export_bones.append(PsaExportBone(pose_bone, armature_object, armature_scales[armature_object]))
@@ -321,6 +326,7 @@ def build_psa(context: Context, options: PsaBuildOptions) -> Psa:
 
     # Restore the previous actions & frame.
     for armature_object, action in saved_armature_object_actions.items():
+        assert armature_object.animation_data
         armature_object.animation_data.action = action
 
     context.scene.frame_set(saved_frame_current)

io_scene_psk_psa/psa/export/operators.py

@@ -35,7 +35,7 @@ def get_sequences_propnames_from_source(sequence_source: str) -> Tuple[str, str]
 
 
 def is_action_for_object(obj: Object, action: Action):
-    if action is None or len(action.fcurves) == 0:
+    if len(action.fcurves) == 0:
         return False
 
     if obj is None or obj.animation_data is None or obj.type != 'ARMATURE':
@@ -44,7 +44,11 @@ def is_action_for_object(obj: Object, action: Action):
     armature_data = typing_cast(Armature, obj.data)
     bone_names = set([x.name for x in armature_data.bones])
 
-    for fcurve in action.fcurves:
+    # The nesting here is absolutely bonkers.
+    for layer in action.layers:
+        for strip in layer.strips:
+            for channelbag in strip.channelbags:
+                for fcurve in channelbag.fcurves:
                     match = re.match(r'pose\.bones\[\"([^\"]+)\"](\[\"([^\"]+)\"])?', fcurve.data_path)
                     if not match:
                         continue
@@ -458,6 +462,9 @@ class PSA_OT_export(Operator, ExportHelper):
         if animation_data is None:
             raise RuntimeError(f'No animation data for object \'{animation_data_object.name}\'')
         
+        if context.active_object is None:
+            raise RuntimeError('No active object')
+
         export_sequences: List[PsaBuildSequence] = []
 
         match pg.sequence_source:
@@ -465,7 +472,7 @@ class PSA_OT_export(Operator, ExportHelper):
                 for action_item in filter(lambda x: x.is_selected, pg.action_list):
                     if len(action_item.action.fcurves) == 0:
                         continue
-                    export_sequence = PsaBuildSequence(context.active_object, animation_data)
+                    export_sequence = PsaBuildSequence(self.armature_objects, animation_data)
                     export_sequence.name = action_item.name
                     export_sequence.nla_state.action = action_item.action
                     export_sequence.nla_state.frame_start = action_item.frame_start
@@ -476,7 +483,7 @@ class PSA_OT_export(Operator, ExportHelper):
                     export_sequences.append(export_sequence)
             case 'TIMELINE_MARKERS':
                 for marker_item in filter(lambda x: x.is_selected, pg.marker_list):
-                    export_sequence = PsaBuildSequence(context.active_object, animation_data)
+                    export_sequence = PsaBuildSequence(self.armature_objects, animation_data)
                     export_sequence.name = marker_item.name
                     export_sequence.nla_state.frame_start = marker_item.frame_start
                     export_sequence.nla_state.frame_end = marker_item.frame_end
@@ -487,7 +494,7 @@ class PSA_OT_export(Operator, ExportHelper):
                     export_sequences.append(export_sequence)
             case 'NLA_TRACK_STRIPS':
                 for nla_strip_item in filter(lambda x: x.is_selected, pg.nla_strip_list):
-                    export_sequence = PsaBuildSequence(context.active_object, animation_data)
+                    export_sequence = PsaBuildSequence(self.armature_objects, animation_data)
                     export_sequence.name = nla_strip_item.name
                     export_sequence.nla_state.frame_start = nla_strip_item.frame_start
                     export_sequence.nla_state.frame_end = nla_strip_item.frame_end
@@ -497,7 +504,7 @@ class PSA_OT_export(Operator, ExportHelper):
                     export_sequences.append(export_sequence)
             case 'ACTIVE_ACTION':
                 for active_action_item in filter(lambda x: x.is_selected, pg.active_action_list):
-                    export_sequence = PsaBuildSequence(active_action_item.armature_object, active_action_item.armature_object.animation_data)
+                    export_sequence = PsaBuildSequence([active_action_item.armature_object], active_action_item.armature_object.animation_data)
                     action = active_action_item.action
                     export_sequence.name = action.name
                     export_sequence.nla_state.action = action
@@ -515,8 +522,6 @@ class PSA_OT_export(Operator, ExportHelper):
             return {'CANCELLED'}
 
         options = PsaBuildOptions()
-        options.armature_objects = self.armature_objects
-        options.animation_data = animation_data
         options.sequences = export_sequences
         options.bone_filter_mode = pg.bone_filter_mode
         options.bone_collection_indices = [PsxBoneCollection(x.armature_object_name, x.armature_data_name, x.index) for x in pg.bone_collection_list if x.is_selected]
@@ -654,10 +659,14 @@ class PSA_OT_export_bone_collections_deselect_all(Operator):
         return {'FINISHED'}
 
 
-classes = (
+_classes = (
     PSA_OT_export,
     PSA_OT_export_actions_select_all,
     PSA_OT_export_actions_deselect_all,
     PSA_OT_export_bone_collections_select_all,
     PSA_OT_export_bone_collections_deselect_all,
 )
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)
+

io_scene_psk_psa/psa/export/properties.py

@@ -132,6 +132,7 @@ sampling_mode_items = (
 
 def sequence_source_update_cb(self: 'PSA_PG_export', context: Context) -> None:
     armature_objects = []
+    assert context.view_layer
     for dfs_object in dfs_view_layer_objects(context.view_layer):
         if dfs_object.obj.type == 'ARMATURE' and dfs_object.is_selected:
             armature_objects.append(dfs_object.obj)
@@ -262,10 +263,14 @@ def filter_sequences(pg: PSA_PG_export, sequences) -> List[int]:
     return flt_flags
 
 
-classes = (
+_classes = (
     PSA_PG_export_action_list_item,
     PSA_PG_export_timeline_markers,
     PSA_PG_export_nla_strip_list_item,
     PSA_PG_export_active_action_list_item,
     PSA_PG_export,
 )
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)
+

io_scene_psk_psa/psa/export/ui.py

@@ -13,7 +13,7 @@ class PSA_UL_export_sequences(UIList):
         # Show the filtering options by default.
         self.use_filter_show = True
 
-    def draw_item(self, context, layout, data, item, icon, active_data, active_propname, index):
+    def draw_item(self, context, layout, data, item, icon, active_data, active_property, index, flt_flag):
         item = typing_cast(PSA_PG_export_action_list_item, item)
 
         is_pose_marker = hasattr(item, 'is_pose_marker') and item.is_pose_marker
@@ -44,7 +44,7 @@ class PSA_UL_export_sequences(UIList):
             subrow.prop(pg, 'sequence_filter_pose_marker', icon_only=True, icon='PMARKER')
             subrow.prop(pg, 'sequence_filter_reversed', text='', icon='FRAME_PREV')
 
-    def filter_items(self, context, data, prop):
+    def filter_items(self, context, data, property):
         pg = getattr(context.scene, 'psa_export')
         actions = getattr(data, prop)
         flt_flags = filter_sequences(pg, actions)
@@ -52,6 +52,10 @@ class PSA_UL_export_sequences(UIList):
         return flt_flags, flt_neworder
 
 
-classes = (
+_classes = (
     PSA_UL_export_sequences,
 )
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)
+

io_scene_psk_psa/psa/import_/operators.py

@@ -8,11 +8,12 @@ from bpy_extras.io_utils import ImportHelper
 
 from .properties import PsaImportMixin, get_visible_sequences
 from ..config import read_psa_config
-from ..importer import PsaImportOptions, import_psa
+from ..importer import BoneMapping, PsaImportOptions, import_psa
 from ..reader import PsaReader
 
 
 def psa_import_poll(cls, context: Context):
+    assert context.view_layer and context.view_layer.objects.active
     active_object = context.view_layer.objects.active
     if active_object is None or active_object.type != 'ARMATURE':
         cls.poll_message_set('The active object must be an armature')
@@ -32,10 +33,12 @@ class PSA_OT_import_sequences_select_from_text(Operator):
         return len(pg.sequence_list) > 0
 
     def invoke(self, context, event):
+        assert context.window_manager
         return context.window_manager.invoke_props_dialog(self, width=256)
 
     def draw(self, context):
         layout = self.layout
+        assert layout
         pg = getattr(context.scene, 'psa_import')
         layout.label(icon='INFO', text='Each sequence name should be on a new line.')
         layout.prop(pg, 'select_text', text='')
@@ -134,6 +137,8 @@ class PSA_OT_import_drag_and_drop(Operator, PsaImportMixin):
         warnings = []
         sequences_count = 0
 
+        assert context.view_layer and context.view_layer.objects.active
+
         for file in self.files:
             psa_path = str(os.path.join(self.directory, file.name))
             psa_reader = PsaReader(psa_path)
@@ -157,12 +162,14 @@ class PSA_OT_import_drag_and_drop(Operator, PsaImportMixin):
 
     def invoke(self, context: Context, event):
         # Make sure the selected object is an obj.
+        assert context.view_layer and context.view_layer.objects.active
         active_object = context.view_layer.objects.active
         if active_object is None or active_object.type != 'ARMATURE':
             self.report({'ERROR_INVALID_CONTEXT'}, 'The active object must be an armature')
             return {'CANCELLED'}
 
         # Show the import operator properties in a pop-up dialog (do not use the file selector).
+        assert context.window_manager
         context.window_manager.invoke_props_dialog(self)
         return {'RUNNING_MODAL'}
 
@@ -181,7 +188,10 @@ def psa_import_options_from_property_group(pg: PsaImportMixin, sequence_names: I
     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.bone_mapping = BoneMapping(
+        is_case_sensitive=pg.bone_mapping_is_case_sensitive,
+        should_ignore_trailing_whitespace=pg.bone_mapping_should_ignore_trailing_whitespace
+    )
     options.fps_source = pg.fps_source
     options.fps_custom = pg.fps_custom
     options.translation_scale = pg.translation_scale
@@ -236,7 +246,10 @@ class PSA_OT_import_all(Operator, PsaImportMixin):
 
         options = PsaImportOptions(
             action_name_prefix=self.action_name_prefix,
-            bone_mapping_mode=self.bone_mapping_mode,
+            bone_mapping=BoneMapping(
+                is_case_sensitive=self.bone_mapping_is_case_sensitive,
+                should_ignore_trailing_whitespace=self.bone_mapping_should_ignore_trailing_whitespace
+            ),
             fps_custom=self.fps_custom,
             fps_source=self.fps_source,
             sequence_names=sequence_names,
@@ -250,6 +263,8 @@ class PSA_OT_import_all(Operator, PsaImportMixin):
             translation_scale=self.translation_scale
         )
 
+        assert context.view_layer
+        assert context.view_layer.objects.active
         result = _import_psa(context, options, self.filepath, context.view_layer.objects.active)
 
         if len(result.warnings) > 0:
@@ -308,12 +323,13 @@ class PSA_OT_import(Operator, ImportHelper, PsaImportMixin):
     def invoke(self, context: Context, event: Event):
         # Attempt to load the PSA file for the pre-selected file.
         load_psa_file(context, self.filepath)
-
+        assert context.window_manager
         context.window_manager.fileselect_add(self)
         return {'RUNNING_MODAL'}
 
     def draw(self, context: Context):
         layout = self.layout
+        assert layout
         pg = getattr(context.scene, 'psa_import')
 
         sequences_header, sequences_panel = layout.panel('sequences_panel_id', default_closed=False)
@@ -370,10 +386,14 @@ class PSA_OT_import(Operator, ImportHelper, PsaImportMixin):
         advanced_header.label(text='Advanced')
 
         if advanced_panel:
-            col = advanced_panel.column()
+            bone_mapping_header, bone_mapping_panel = layout.panel('bone_mapping_id', default_closed=False)
+            bone_mapping_header.label(text='Bone Mapping')
+            if bone_mapping_panel:
+                col = bone_mapping_panel.column()
                 col.use_property_split = True
                 col.use_property_decorate = False
-            col.prop(self, 'bone_mapping_mode')
+                col.prop(self, 'bone_mapping_is_case_sensitive')
+                col.prop(self, 'bone_mapping_should_ignore_trailing_whitespace')
 
             col = advanced_panel.column()
             col.use_property_split = True
@@ -412,10 +432,15 @@ def draw_psa_import_options_no_panels(layout, pg: PsaImportMixin):
         col.use_property_decorate = False
         col.prop(pg, 'should_convert_to_samples')
 
+    col = layout.column(heading='Bone Mapping')
+    col.use_property_split = True
+    col.use_property_decorate = False
+    col.prop(pg, 'bone_mapping_is_case_sensitive')
+    col.prop(pg, 'bone_mapping_should_ignore_trailing_whitespace')
+
     col = layout.column()
     col.use_property_split = True
     col.use_property_decorate = False
-    col.prop(pg, 'bone_mapping_mode')
     col.prop(pg, 'translation_scale')
 
     col = layout.column(heading='Options')
@@ -434,11 +459,11 @@ class PSA_FH_import(FileHandler):  # TODO: rename and add handling for PSA expor
     bl_file_extensions = '.psa'
 
     @classmethod
-    def poll_drop(cls, context: Context):
-        return context.area and context.area.type == 'VIEW_3D'
+    def poll_drop(cls, context: Context) -> bool:
+        return context.area is not None and context.area.type == 'VIEW_3D'
 
 
-classes = (
+_classes = (
     PSA_OT_import_sequences_select_all,
     PSA_OT_import_sequences_deselect_all,
     PSA_OT_import_sequences_select_from_text,
@@ -447,3 +472,6 @@ classes = (
     PSA_OT_import_drag_and_drop,
     PSA_FH_import,
 )
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)

io_scene_psk_psa/psa/import_/properties.py

@@ -80,12 +80,13 @@ class PsaImportMixin:
         description='Convert keyframes to read-only samples. '
                     'Recommended if you do not plan on editing the actions directly'
     )
-    bone_mapping_mode: EnumProperty(
-        name='Bone Mapping',
-        options=set(),
-        description='The method by which bones from the incoming PSA file are mapped to the armature',
-        items=bone_mapping_items,
-        default='CASE_INSENSITIVE'
+    bone_mapping_is_case_sensitive: BoolProperty(
+        default=False,
+        name='Case Sensitive'
+        )
+    bone_mapping_should_ignore_trailing_whitespace: BoolProperty(
+        default=True,
+        name='Ignore Trailing Whitespace'
     )
     fps_source: EnumProperty(name='FPS Source', items=fps_source_items)
     fps_custom: FloatProperty(
@@ -175,9 +176,12 @@ def get_visible_sequences(pg: PSA_PG_import, sequences) -> List[PSA_PG_import_ac
     return visible_sequences
 
 
-classes = (
+_classes = (
     PSA_PG_import_action_list_item,
     PSA_PG_bone,
     PSA_PG_data,
     PSA_PG_import,
 )
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)

io_scene_psk_psa/psa/import_/ui.py

@@ -42,8 +42,11 @@ class PSA_UL_import_actions(PSA_UL_sequences_mixin):
     pass
 
 
-classes = (
+_classes = (
     PSA_UL_sequences,
     PSA_UL_import_sequences,
     PSA_UL_import_actions,
 )
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)

io_scene_psk_psa/psa/importer.py

@@ -2,6 +2,7 @@ from typing import Sequence, Iterable, List, Optional, cast as typing_cast
 
 import bpy
 import numpy as np
+import re
 from bpy.types import Armature, Context, FCurve, Object, Bone, PoseBone
 from mathutils import Vector, Quaternion
 
@@ -9,11 +10,22 @@ from .config import PsaConfig, REMOVE_TRACK_LOCATION, REMOVE_TRACK_ROTATION
 from .reader import PsaReader
 from ..shared.data import PsxBone
 
+class BoneMapping:
+    def __init__(self,
+                 is_case_sensitive: bool = False,
+                 should_ignore_trailing_whitespace: bool = True
+                 ):
+        self.is_case_sensitive = is_case_sensitive
+        # Ancient PSK and PSA exporters would, for some reason, pad the bone names with spaces
+        # instead of just writing null bytes, probably because the programmers were lazy.
+        # By default, we will ignore trailing whitespace when doing comparisons.
+        self.should_ignore_trailing_whitespace = should_ignore_trailing_whitespace
+
 
 class PsaImportOptions(object):
     def __init__(self,
                  action_name_prefix: str = '',
-                 bone_mapping_mode: str = 'CASE_INSENSITIVE',
+                 bone_mapping: BoneMapping = BoneMapping(),
                  fps_custom: float = 30.0,
                  fps_source: str = 'SEQUENCE',
                  psa_config: PsaConfig = PsaConfig(),
@@ -28,7 +40,7 @@ class PsaImportOptions(object):
                  translation_scale: float = 1.0
                  ):
         self.action_name_prefix = action_name_prefix
-        self.bone_mapping_mode = bone_mapping_mode
+        self.bone_mapping = bone_mapping
         self.fps_custom = fps_custom
         self.fps_source = fps_source
         self.psa_config = psa_config
@@ -78,20 +90,30 @@ class PsaImportResult:
         self.warnings: List[str] = []
 
 
-def _get_armature_bone_index_for_psa_bone(psa_bone_name: str, armature_bone_names: List[str], bone_mapping_mode: str = 'EXACT') -> Optional[int]:
+def _get_armature_bone_index_for_psa_bone(psa_bone_name: str, armature_bone_names: List[str], bone_mapping: BoneMapping) -> Optional[int]:
     """
     @param psa_bone_name: The name of the PSA bone.
     @param armature_bone_names: The names of the bones in the armature.
-    @param bone_mapping_mode: One of `['EXACT', 'CASE_INSENSITIVE']`.
+    @param bone_mapping: Bone mapping information.
     @return: The index of the armature bone that corresponds to the given PSA bone, or None if no such bone exists.
     """
+    # Use regular expressions for bone name matching.
+    pattern = psa_bone_name
+    flags = 0
+
+    if bone_mapping.should_ignore_trailing_whitespace:
+        psa_bone_name = psa_bone_name.rstrip()
+        pattern += r'\s*'
+    
+    if not bone_mapping.is_case_sensitive:
+        flags = re.IGNORECASE
+    
+    pattern = re.compile(pattern, flags)
+
     for armature_bone_index, armature_bone_name in enumerate(armature_bone_names):
-        if bone_mapping_mode == 'CASE_INSENSITIVE':
-            if armature_bone_name.lower() == psa_bone_name.lower():
-                return armature_bone_index
-        else:
-            if armature_bone_name == psa_bone_name:
+        if re.fullmatch(pattern, armature_bone_name):
             return armature_bone_index
+
     return None
 
 
@@ -145,6 +167,9 @@ def _resample_sequence_data_matrix(sequence_data_matrix: np.ndarray, frame_step:
 
 
 def import_psa(context: Context, psa_reader: PsaReader, armature_object: Object, options: PsaImportOptions) -> PsaImportResult:
+
+    assert context.window_manager
+
     result = PsaImportResult()
     sequences = [psa_reader.sequences[x] for x in options.sequence_names]
     armature_data = typing_cast(Armature, armature_object.data)
@@ -158,7 +183,7 @@ def import_psa(context: Context, psa_reader: PsaReader, armature_object: Object,
 
     for psa_bone_index, psa_bone in enumerate(psa_reader.bones):
         psa_bone_name: str = psa_bone.name.decode('windows-1252')
-        armature_bone_index = _get_armature_bone_index_for_psa_bone(psa_bone_name, armature_bone_names, options.bone_mapping_mode)
+        armature_bone_index = _get_armature_bone_index_for_psa_bone(psa_bone_name, armature_bone_names, options.bone_mapping)
         if armature_bone_index is not None:
             # Ensure that no other PSA bone has been mapped to this armature bone yet.
             if armature_bone_index not in armature_to_psa_bone_indices:
@@ -259,6 +284,7 @@ def import_psa(context: Context, psa_reader: PsaReader, armature_object: Object,
             case 'CUSTOM':
                 target_fps = options.fps_custom
             case 'SCENE':
+                assert context.scene
                 target_fps = context.scene.render.fps
             case 'SEQUENCE':
                 target_fps = sequence.fps
@@ -349,7 +375,7 @@ def import_psa(context: Context, psa_reader: PsaReader, armature_object: Object,
         if animation_data is None:
             animation_data = armature_object.animation_data_create()
         for action in actions:
-            nla_track = armature_object.animation_data.nla_tracks.new()
+            nla_track = animation_data.nla_tracks.new()
             nla_track.name = action.name
             nla_track.mute = True
             nla_track.strips.new(name=action.name, start=0, action=action)

io_scene_psk_psa/psa/reader.py

@@ -17,7 +17,7 @@ def _try_fix_cue4parse_issue_103(sequences) -> bool:
         # Manually set the frame_start_index for each sequence. This assumes that the sequences are in order with
         # no shared frames between sequences (all exporters that I know of do this, so it's a safe assumption).
         frame_start_index = 0
-        for i, sequence in enumerate(sequences):
+        for sequence in sequences:
             sequence.frame_start_index = frame_start_index
             frame_start_index += sequence.frame_count
         return True

io_scene_psk_psa/psk/builder.py

@@ -1,7 +1,7 @@
 import bmesh
 import bpy
 import numpy as np
-from bpy.types import Armature, Collection, Context, Depsgraph, Object, ArmatureModifier
+from bpy.types import Armature, Collection, Context, Depsgraph, Object, ArmatureModifier, Mesh
 from mathutils import Matrix
 from typing import Dict, Iterable, List, Optional, Set, cast as typing_cast
 from .data import Psk
@@ -94,9 +94,9 @@ def get_psk_input_objects_for_collection(collection: Collection) -> PskInputObje
 
 
 class PskBuildResult(object):
-    def __init__(self):
-        self.psk = None
-        self.warnings: List[str] = []
+    def __init__(self, psk: Psk, warnings: list[str]):
+        self.psk: Psk = psk
+        self.warnings: List[str] = warnings
 
 
 def _get_mesh_export_space_matrix(armature_object: Optional[Object], export_space: str) -> Matrix:
@@ -137,9 +137,12 @@ def _get_material_name_indices(obj: Object, material_names: List[str]) -> Iterab
 
 
 def build_psk(context: Context, input_objects: PskInputObjects, options: PskBuildOptions) -> PskBuildResult:
+
+    assert context.window_manager
+
     armature_objects = list(input_objects.armature_objects)
 
-    result = PskBuildResult()
+    warnings: list[str] = []
     psk = Psk()
 
     psx_bone_create_result = create_psx_bones(
@@ -208,7 +211,8 @@ def build_psk(context: Context, input_objects: PskInputObjects, options: PskBuil
     # Temporarily force the armature into the rest position.
     # We will undo this later.
     for armature_object in armature_objects:
-        armature_object.data.pose_position = 'REST'
+        armature_data = typing_cast(Armature, armature_object.data)
+        armature_data.pose_position = 'REST'
 
     material_names = [m.name if m is not None else 'None' for m in materials]
 
@@ -232,7 +236,7 @@ def build_psk(context: Context, input_objects: PskInputObjects, options: PskBuil
         match options.object_eval_state:
             case 'ORIGINAL':
                 mesh_object = obj
-                mesh_data = obj.data
+                mesh_data = typing_cast(Mesh, obj.data)
             case 'EVALUATED':
                 # Create a copy of the mesh object after non-armature modifiers are applied.
                 depsgraph = context.evaluated_depsgraph_get()
@@ -299,7 +303,7 @@ def build_psk(context: Context, input_objects: PskInputObjects, options: PskBuil
         mesh_data.calc_loop_triangles()
 
         if mesh_data.uv_layers.active is None:
-            result.warnings.append(f'"{mesh_object.name}" has no active UV Map')
+            warnings.append(f'"{mesh_object.name}" has no active UV Map')
 
         # Build a list of non-unique wedges.
         wedges = []
@@ -423,13 +427,12 @@ def build_psk(context: Context, input_objects: PskInputObjects, options: PskBuil
 
     # Restore the original pose position of the armature objects.
     for armature_object, pose_position in original_armature_object_pose_positions.items():
-        armature_object.data.pose_position = pose_position
+        armature_data = typing_cast(Armature, armature_object.data)
+        armature_data.pose_position = pose_position
 
     # https://github.com/DarklightGames/io_scene_psk_psa/issues/129.
     psk.sort_and_normalize_weights()
 
     context.window_manager.progress_end()
 
-    result.psk = psk
-
-    return result
+    return PskBuildResult(psk, warnings)

io_scene_psk_psa/psk/export/operators.py

@@ -3,7 +3,7 @@ from typing import Iterable, List, Optional, cast as typing_cast
 
 import bpy
 from bpy.props import BoolProperty, StringProperty
-from bpy.types import Collection, Context, Depsgraph, Material, Object, Operator, SpaceProperties, Scene
+from bpy.types import Context, Depsgraph, Material, Object, Operator, Scene
 from bpy_extras.io_utils import ExportHelper
 
 from .properties import PskExportMixin
@@ -91,6 +91,7 @@ class PSK_OT_populate_material_name_list(Operator):
             self.report({'ERROR_INVALID_CONTEXT'}, 'No valid export operator found in context')
             return {'CANCELLED'}
         depsgraph = context.evaluated_depsgraph_get()
+        assert context.collection
         input_objects = get_psk_input_objects_for_collection(context.collection)
         try:
             populate_material_name_list(depsgraph, [x.obj for x in input_objects.mesh_dfs_objects], export_operator.material_name_list)
@@ -115,6 +116,7 @@ class PSK_OT_material_list_name_add(Operator):
     name: StringProperty(search=material_list_names_search_cb, name='Material Name', default='None')
 
     def invoke(self, context, event):
+        assert context.window_manager
         return context.window_manager.invoke_props_dialog(self)
 
     def execute(self, context):
@@ -266,7 +268,10 @@ class PSK_OT_export_collection(Operator, ExportHelper, PskExportMixin):
     collection: StringProperty(options={'HIDDEN'})
 
     def execute(self, context):
-        collection = bpy.data.collections.get(self.collection)
+        collection = bpy.data.collections.get(self.collection, None)
+
+        if collection is not None:
+            return {'CANCELLED'}
 
         try:
             input_objects = get_psk_input_objects_for_collection(collection)
@@ -295,6 +300,8 @@ class PSK_OT_export_collection(Operator, ExportHelper, PskExportMixin):
     def draw(self, context: Context):
         layout = self.layout
 
+        assert layout is not None
+
         flow = layout.grid_flow(row_major=True)
         flow.use_property_split = True
         flow.use_property_decorate = False
@@ -376,6 +383,8 @@ class PSK_OT_export_collection(Operator, ExportHelper, PskExportMixin):
                     flow.enabled = False
                 case 'CUSTOM':
                     transform_source = self
+                case _:
+                    assert False, f'Invalid transform source: {self.transform_source}'
         
             flow.prop(transform_source, 'scale')
             flow.prop(transform_source, 'forward_axis')
@@ -414,6 +423,7 @@ class PSK_OT_export(Operator, ExportHelper):
             self.report({'ERROR_INVALID_CONTEXT'}, str(e))
             return {'CANCELLED'}
 
+        assert context.window_manager
         context.window_manager.fileselect_add(self)
 
         return {'RUNNING_MODAL'}
@@ -421,6 +431,8 @@ class PSK_OT_export(Operator, ExportHelper):
     def draw(self, context):
         layout = self.layout
 
+        assert layout
+
         pg = getattr(context.scene, 'psk_export')
 
         # Mesh
@@ -490,6 +502,8 @@ class PSK_OT_export(Operator, ExportHelper):
     def execute(self, context):
         pg = getattr(context.scene, 'psk_export')
 
+        assert context.scene
+
         input_objects = get_psk_input_objects_for_context(context)
         options = get_psk_build_options_from_property_group(context.scene, pg)
 
@@ -509,7 +523,7 @@ class PSK_OT_export(Operator, ExportHelper):
         return {'FINISHED'}
 
 
-classes = (
+_classes = (
     PSK_OT_material_list_move_up,
     PSK_OT_material_list_move_down,
     PSK_OT_export,
@@ -521,3 +535,6 @@ classes = (
     PSK_OT_material_list_name_move_down,
     PSK_OT_material_list_name_add,
 )
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)

io_scene_psk_psa/psk/export/properties.py

@@ -52,7 +52,7 @@ class PskExportMixin(ExportSpaceMixin, TransformMixin, PsxBoneExportMixin):
     material_name_list: CollectionProperty(type=PSK_PG_material_name_list_item)
     material_name_list_index: IntProperty(default=0)
     should_export_vertex_normals: BoolProperty(
-        'Export Vertex Normals',
+        name='Export Vertex Normals',
         default=False,
         description='Export VTXNORMS section.'
     )
@@ -67,8 +67,12 @@ class PSK_PG_export(PropertyGroup, PskExportMixin):
     pass
 
 
-classes = (
+_classes = (
     PSK_PG_material_list_item,
     PSK_PG_material_name_list_item,
     PSK_PG_export,
 )
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)
+

io_scene_psk_psa/psk/export/ui.py

@@ -10,6 +10,9 @@ class PSK_UL_material_names(UIList):
         row.prop(item, 'material_name', text='', emboss=False, icon_value=icon_value, icon='BLANK1' if icon_value == 0 else 'NONE')
 
 
-classes = (
+_classes = (
     PSK_UL_material_names,
 )
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)

io_scene_psk_psa/psk/import_/operators.py

@@ -1,14 +1,19 @@
 import os
 from pathlib import Path
 
-from bpy.props import CollectionProperty, StringProperty
-from bpy.types import Context, FileHandler, Operator, OperatorFileListElement, UILayout
+from typing import cast as typing_cast
+from bpy.props import CollectionProperty, StringProperty, FloatProperty, EnumProperty
+from bpy.types import Armature, Context, FileHandler, Operator, OperatorFileListElement, UILayout
 from bpy_extras.io_utils import ImportHelper
 
+from ...shared.helpers import get_coordinate_system_transform
+from ...shared.types import AxisMixin
+
 from ..importer import PskImportOptions, import_psk
 from ..properties import PskImportMixin
 from ..reader import read_psk
 
+
 def get_psk_import_options_from_properties(property_group: PskImportMixin):
     options = PskImportOptions()
     options.should_import_mesh = property_group.should_import_mesh
@@ -109,6 +114,7 @@ class PSK_OT_import(Operator, ImportHelper, PskImportMixin):
         return {'FINISHED'}
 
     def draw(self, context):
+        assert self.layout
         psk_import_draw(self.layout, self)
 
 
@@ -122,13 +128,15 @@ class PSK_OT_import_drag_and_drop(Operator, PskImportMixin):
     files: CollectionProperty(type=OperatorFileListElement, options={'SKIP_SAVE', 'HIDDEN'})
 
     @classmethod
-    def poll(cls, context):
-        return context.area and context.area.type == 'VIEW_3D'
+    def poll(cls, context) -> bool:
+        return context.area is not None and context.area.type == 'VIEW_3D'
 
     def draw(self, context):
+        assert self.layout
         psk_import_draw(self.layout, self)
 
     def invoke(self, context, event):
+        assert context.window_manager
         context.window_manager.invoke_props_dialog(self)
         return {'RUNNING_MODAL'}
 
@@ -158,6 +166,46 @@ class PSK_OT_import_drag_and_drop(Operator, PskImportMixin):
         return {'FINISHED'}
 
 
+class PSK_OT_create_bones_from_selected_objects(Operator, AxisMixin):
+    bl_idname = 'psk.create_bones_from_selected_objects'
+    bl_label = 'Create Bones from Selected Objects'
+    bl_options = {'UNDO'}
+
+    length: FloatProperty(name='Length', subtype='DISTANCE', default=0.01)
+    
+    @classmethod
+    def poll(cls, context: Context) -> bool:
+        return context.active_object is not None and context.active_object.type == 'ARMATURE'
+
+    def invoke(self, context, event):
+        assert context.window_manager
+        return context.window_manager.invoke_props_dialog(self)
+
+    def execute(self, context: Context):
+        armature_object = context.active_object
+        
+        assert armature_object
+
+        armature_data = typing_cast(Armature, armature_object.data)
+        axis_transform = get_coordinate_system_transform(self.forward_axis, self.up_axis)
+
+        import bpy
+        bpy.ops.object.mode_set(mode='EDIT')
+
+        for index, obj in enumerate(context.selected_objects):
+            if obj == armature_object:
+                continue
+            edit_bone_matrix = armature_object.matrix_world.inverted() @ obj.matrix_world
+            edit_bone = armature_data.edit_bones.new(f'{obj.name}_{index}')
+            # translation, rotation, _ = edit_bone_matrix.decompose()
+            edit_bone.length = self.length
+            edit_bone.matrix = edit_bone_matrix @ axis_transform
+        
+        bpy.ops.object.mode_set(mode='OBJECT')
+
+        return {'FINISHED'}
+
+
 # TODO: move to another file
 class PSK_FH_import(FileHandler):
     bl_idname = 'PSK_FH_import'
@@ -167,12 +215,15 @@ class PSK_FH_import(FileHandler):
     bl_file_extensions = '.psk;.pskx'
 
     @classmethod
-    def poll_drop(cls, context: Context):
-        return context.area and context.area.type == 'VIEW_3D'
+    def poll_drop(cls, context: Context) -> bool:
+        return context.area is not None and context.area.type == 'VIEW_3D'
 
 
-classes = (
+_classes = (
     PSK_OT_import,
     PSK_OT_import_drag_and_drop,
     PSK_FH_import,
 )
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)

io_scene_psk_psa/psk/importer.py

@@ -53,7 +53,7 @@ class PskImportResult:
         self.mesh_object: Optional[Object] = None
 
     @property
-    def root_object(self) -> Object:
+    def root_object(self) -> Optional[Object]:
         return self.armature_object if self.armature_object is not None else self.mesh_object
 
 
@@ -62,6 +62,9 @@ def import_psk(psk: Psk, context: Context, name: str, options: PskImportOptions)
     armature_object = None
     mesh_object = None
 
+    assert context.scene
+    assert bpy.context.view_layer
+
     if options.should_import_armature:
         # Armature
         armature_data = bpy.data.armatures.new(name)
@@ -201,7 +204,7 @@ def import_psk(psk: Psk, context: Context, name: str, options: PskImportOptions)
         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
-            uv_layer_data = np.zeros((len(psk.faces) * 3, 2), dtype=np.float32)
+            uv_layer_data = np.zeros((face_count * 3, 2), dtype=np.float32)
             for extra_uv_index in range(extra_uv_channel_count):
                 uv_layer_data_index = 0
                 for face_index, face in enumerate(psk.faces):

io_scene_psk_psa/psk/properties.py

@@ -145,6 +145,10 @@ class PskImportMixin:
     )
 
 
-classes = (
+_classes = (
     PSX_PG_material,
 )
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)
+

io_scene_psk_psa/psk/ui.py

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

io_scene_psk_psa/shared/types.py

@@ -94,14 +94,7 @@ def up_axis_update(self, __context):
         self.forward_axis = next((axis for axis in axis_identifiers if axis != self.up_axis), 'X')
 
 
-class TransformMixin:
-    scale: FloatProperty(
-        name='Scale',
-        default=1.0,
-        description='Scale factor to apply to all location data',
-        soft_min=0.0,
-        soft_max=100.0
-    )
+class AxisMixin:
     forward_axis: EnumProperty(
         name='Forward',
         items=forward_items,
@@ -116,6 +109,16 @@ class TransformMixin:
     )
 
 
+class TransformMixin(AxisMixin):
+    scale: FloatProperty(
+        name='Scale',
+        default=1.0,
+        description='Scale factor to apply to all location data',
+        soft_min=0.0,
+        soft_max=100.0
+    )
+
+
 export_space_items = [
     ('WORLD', 'World', 'Export in world space'),
     ('ARMATURE', 'Armature', 'Export the local space of the armature object'),
@@ -151,10 +154,13 @@ class PSX_PG_scene_export(PropertyGroup, TransformMixin):
     pass
 
 
-classes = (
+_classes = (
     PSX_PG_scene_export,
     PSX_PG_action_export,
     PSX_PG_bone_collection_list_item,
     PSX_UL_bone_collection_list,
     PSX_PT_action,
 )
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)

io_scene_psk_psa/shared/ui.py

@@ -50,6 +50,10 @@ class PSX_PT_scene(Panel):
             flow.prop(psx_export, 'up_axis')
 
 
-classes = (
+_classes = (
     PSX_PT_scene,
 )
+
+from bpy.utils import register_classes_factory
+register, unregister = register_classes_factory(_classes)
+

tests/psk_import_test.py

@@ -4,6 +4,7 @@ import pytest
 SUZANNE_FILEPATH = 'tests/data/Suzanne.psk'
 SARGE_FILEPATH = 'tests/data/CS_Sarge_S0_Skelmesh.pskx'
 SLURP_MONSTER_AXE_FILEPATH = 'tests/data/Slurp_Monster_Axe_LOD0.psk'
+BAT_FILEPATH = 'tests/data/Bat.psk'
 
 
 @pytest.fixture(autouse=True)
@@ -280,3 +281,9 @@ def test_psk_import_without_shape_keys():
     assert mesh_object.type == 'MESH', "Mesh object type should be MESH"
     assert mesh_object.data.shape_keys is None, "Mesh object should not have shape keys"
 
+
+def test_psk_import_with_invalid_faces():
+    assert bpy.ops.psk.import_file(
+        filepath=BAT_FILEPATH,
+        components='MESH'
+        ) == {'FINISHED'}