feat: Add VRM Blender addon with complete import/export functionality

- Add core VRM addon infrastructure with manifest and registration
- Add common utilities module with file system, logging, and conversion helpers
- Add human bone mapper with support for multiple rigging standards (Mixamo, MMD, Unreal, Rigify, etc.)
- Add VRM 0.x and 1.x format support with property groups and handlers
- Add editor UI panels for VRM metadata, spring bones, and MToon materials
- Add exporter with glTF2 extension support for VRM format serialization
- Add importer with scene reconstruction and armature generation
- Add MToon shader support with auto-setup and material migration
- Add spring bone physics simulation with constraint handling
- Add node constraint editor for advanced rigging control
- Add comprehensive validation and error handling with user dialogs
- Add scene watcher for real-time property synchronization
- Add workspace management and preference system
- Include Python cache files and Blender manifest configuration
- This is the initial commit establishing the complete VRM addon ecosystem for Blender

common/human_bone_mapper/mixamo_mapping.py

@@ -0,0 +1,62 @@
+# SPDX-License-Identifier: MIT OR GPL-3.0-or-later
+from collections.abc import Mapping
+from typing import Final
+
+from ..vrm1.human_bone import HumanBoneSpecification, HumanBoneSpecifications
+
+MAPPING: Final[Mapping[str, HumanBoneSpecification]] = {
+    "mixamorig:Head": HumanBoneSpecifications.HEAD,
+    "mixamorig:Neck": HumanBoneSpecifications.NECK,
+    "mixamorig:Spine2": HumanBoneSpecifications.UPPER_CHEST,
+    "mixamorig:Spine1": HumanBoneSpecifications.CHEST,
+    "mixamorig:Spine": HumanBoneSpecifications.SPINE,
+    "mixamorig:Hips": HumanBoneSpecifications.HIPS,
+    "mixamorig:RightShoulder": HumanBoneSpecifications.RIGHT_SHOULDER,
+    "mixamorig:RightArm": HumanBoneSpecifications.RIGHT_UPPER_ARM,
+    "mixamorig:RightForeArm": HumanBoneSpecifications.RIGHT_LOWER_ARM,
+    "mixamorig:RightHand": HumanBoneSpecifications.RIGHT_HAND,
+    "mixamorig:LeftShoulder": HumanBoneSpecifications.LEFT_SHOULDER,
+    "mixamorig:LeftArm": HumanBoneSpecifications.LEFT_UPPER_ARM,
+    "mixamorig:LeftForeArm": HumanBoneSpecifications.LEFT_LOWER_ARM,
+    "mixamorig:LeftHand": HumanBoneSpecifications.LEFT_HAND,
+    "mixamorig:RightUpLeg": HumanBoneSpecifications.RIGHT_UPPER_LEG,
+    "mixamorig:RightLeg": HumanBoneSpecifications.RIGHT_LOWER_LEG,
+    "mixamorig:RightFoot": HumanBoneSpecifications.RIGHT_FOOT,
+    "mixamorig:RightToeBase": HumanBoneSpecifications.RIGHT_TOES,
+    "mixamorig:LeftUpLeg": HumanBoneSpecifications.LEFT_UPPER_LEG,
+    "mixamorig:LeftLeg": HumanBoneSpecifications.LEFT_LOWER_LEG,
+    "mixamorig:LeftFoot": HumanBoneSpecifications.LEFT_FOOT,
+    "mixamorig:LeftToeBase": HumanBoneSpecifications.LEFT_TOES,
+    "mixamorig:RightHandThumb1": HumanBoneSpecifications.RIGHT_THUMB_METACARPAL,
+    "mixamorig:RightHandThumb2": HumanBoneSpecifications.RIGHT_THUMB_PROXIMAL,
+    "mixamorig:RightHandThumb3": HumanBoneSpecifications.RIGHT_THUMB_DISTAL,
+    "mixamorig:RightHandIndex1": HumanBoneSpecifications.RIGHT_INDEX_PROXIMAL,
+    "mixamorig:RightHandIndex2": HumanBoneSpecifications.RIGHT_INDEX_INTERMEDIATE,
+    "mixamorig:RightHandIndex3": HumanBoneSpecifications.RIGHT_INDEX_DISTAL,
+    "mixamorig:RightHandMiddle1": HumanBoneSpecifications.RIGHT_MIDDLE_PROXIMAL,
+    "mixamorig:RightHandMiddle2": HumanBoneSpecifications.RIGHT_MIDDLE_INTERMEDIATE,
+    "mixamorig:RightHandMiddle3": HumanBoneSpecifications.RIGHT_MIDDLE_DISTAL,
+    "mixamorig:RightHandRing1": HumanBoneSpecifications.RIGHT_RING_PROXIMAL,
+    "mixamorig:RightHandRing2": HumanBoneSpecifications.RIGHT_RING_INTERMEDIATE,
+    "mixamorig:RightHandRing3": HumanBoneSpecifications.RIGHT_RING_DISTAL,
+    "mixamorig:RightHandPinky1": HumanBoneSpecifications.RIGHT_LITTLE_PROXIMAL,
+    "mixamorig:RightHandPinky2": HumanBoneSpecifications.RIGHT_LITTLE_INTERMEDIATE,
+    "mixamorig:RightHandPinky3": HumanBoneSpecifications.RIGHT_LITTLE_DISTAL,
+    "mixamorig:LeftHandThumb1": HumanBoneSpecifications.LEFT_THUMB_METACARPAL,
+    "mixamorig:LeftHandThumb2": HumanBoneSpecifications.LEFT_THUMB_PROXIMAL,
+    "mixamorig:LeftHandThumb3": HumanBoneSpecifications.LEFT_THUMB_DISTAL,
+    "mixamorig:LeftHandIndex1": HumanBoneSpecifications.LEFT_INDEX_PROXIMAL,
+    "mixamorig:LeftHandIndex2": HumanBoneSpecifications.LEFT_INDEX_INTERMEDIATE,
+    "mixamorig:LeftHandIndex3": HumanBoneSpecifications.LEFT_INDEX_DISTAL,
+    "mixamorig:LeftHandMiddle1": HumanBoneSpecifications.LEFT_MIDDLE_PROXIMAL,
+    "mixamorig:LeftHandMiddle2": HumanBoneSpecifications.LEFT_MIDDLE_INTERMEDIATE,
+    "mixamorig:LeftHandMiddle3": HumanBoneSpecifications.LEFT_MIDDLE_DISTAL,
+    "mixamorig:LeftHandRing1": HumanBoneSpecifications.LEFT_RING_PROXIMAL,
+    "mixamorig:LeftHandRing2": HumanBoneSpecifications.LEFT_RING_INTERMEDIATE,
+    "mixamorig:LeftHandRing3": HumanBoneSpecifications.LEFT_RING_DISTAL,
+    "mixamorig:LeftHandPinky1": HumanBoneSpecifications.LEFT_LITTLE_PROXIMAL,
+    "mixamorig:LeftHandPinky2": HumanBoneSpecifications.LEFT_LITTLE_INTERMEDIATE,
+    "mixamorig:LeftHandPinky3": HumanBoneSpecifications.LEFT_LITTLE_DISTAL,
+}
+
+CONFIG: Final = ("Mixamo", MAPPING)