feat: Export >4 bone influences

Ported from
#346

src/io_scene_vrm/common/preferences.py

@@ -52,6 +52,7 @@ class ExportPreferencesProtocol(Protocol):
     export_only_selections: bool
     enable_advanced_preferences: bool
     export_fb_ngon_encoding: bool
+    export_all_influences: bool
 
 
 def copy_export_preferences(
@@ -62,11 +63,13 @@ def copy_export_preferences(
         destination.export_only_selections,
         destination.enable_advanced_preferences,
         destination.export_fb_ngon_encoding,
+        destination.export_all_influences,
     ) = (
         source.export_invisibles,
         source.export_only_selections,
         source.enable_advanced_preferences,
         source.export_fb_ngon_encoding,
+        source.export_all_influences,
     )
 
 
@@ -82,6 +85,7 @@ def draw_export_preferences_layout(
     if preferences.enable_advanced_preferences:
         advanced_options_box = layout.box()
         advanced_options_box.prop(preferences, "export_fb_ngon_encoding")
+        advanced_options_box.prop(preferences, "export_all_influences")
 
 
 class VrmAddonPreferences(AddonPreferences):
@@ -124,6 +128,10 @@ class VrmAddonPreferences(AddonPreferences):
         name="Try the FB_ngon_encoding under development"
         + " (Exported meshes can be corrupted)",
     )
+    export_all_influences: BoolProperty(  # type: ignore[valid-type]
+        name="Export All Bone Influences (Don't limit to 4, most viewers truncate to 4, so bone movement may cause jagged meshes)",
+        default=True,
+    )
 
     def draw(self, _context: Context) -> None:
         layout = self.layout
@@ -159,6 +167,7 @@ def draw(self, _context: Context) -> None:
         export_only_selections: bool  # type: ignore[no-redef]
         enable_advanced_preferences: bool  # type: ignore[no-redef]
         export_fb_ngon_encoding: bool  # type: ignore[no-redef]
+        export_all_influences: bool  # type: ignore[no-redef]
 
 
 def get_preferences(context: Context) -> VrmAddonPreferences:

src/io_scene_vrm/exporter/export_scene.py

@@ -94,6 +94,11 @@ class EXPORT_SCENE_OT_vrm(Operator, ExportHelper):
         + " (Exported meshes can be corrupted)",
         update=export_vrm_update_addon_preferences,
     )
+    export_all_influences: BoolProperty(  # type: ignore[valid-type]
+        name="Export All Bone Influences (Don't limit to 4, most viewers truncate to 4, so bone movement may cause jagged meshes)",
+        update=export_vrm_update_addon_preferences,
+        default=True,
+    )
 
     errors: CollectionProperty(  # type: ignore[valid-type]
         type=validation.VrmValidationError,
@@ -140,7 +145,9 @@ def execute(self, context: Context) -> set[str]:
 
         if is_vrm1:
             vrm_exporter: AbstractBaseVrmExporter = Gltf2AddonVrmExporter(
-                context, export_objects
+                context,
+                export_objects,
+                self.export_all_influences,
             )
         else:
             vrm_exporter = LegacyVrmExporter(
@@ -258,6 +265,7 @@ def draw(self, _context: Context) -> None:
         export_only_selections: bool  # type: ignore[no-redef]
         enable_advanced_preferences: bool  # type: ignore[no-redef]
         export_fb_ngon_encoding: bool  # type: ignore[no-redef]
+        export_all_influences: bool  # type: ignore[no-redef]
         errors: CollectionPropertyProtocol[VrmValidationError]  # type: ignore[no-redef]
         armature_object_name: str  # type: ignore[no-redef]
         ignore_warning: bool  # type: ignore[no-redef]

src/io_scene_vrm/exporter/gltf2_addon_vrm_exporter.py

@@ -59,9 +59,11 @@ def __init__(
         self,
         context: Context,
         export_objects: list[Object],
+        export_all_influences: bool,
     ) -> None:
         super().__init__(context)
         self.export_objects = export_objects
+        self.export_all_influences = export_all_influences
 
         armatures = [obj for obj in export_objects if obj.type == "ARMATURE"]
         if not armatures:
@@ -2042,6 +2044,7 @@ def export_vrm(self) -> Optional[bytes]:
                         use_selection=True,
                         export_animations=True,
                         export_rest_position_armature=False,
+                        export_all_influences=self.export_all_influences,  # Models may appear incorrectly in many viewers
                         # UniVRM 0.115.0 doesn't support `export_try_sparse_sk`
                         # https://github.com/saturday06/VRM-Addon-for-Blender/issues/381#issuecomment-1838365762
                         export_try_sparse_sk=False,

src/io_scene_vrm/external/io_scene_gltf2_support.py

@@ -125,6 +125,7 @@ class ExportSceneGltfArguments:
     use_selection: bool
     export_animations: bool
     export_rest_position_armature: bool
+    export_all_influences: bool
     export_try_sparse_sk: bool
 
 
@@ -138,6 +139,7 @@ def __invoke_export_scene_gltf(arguments: ExportSceneGltfArguments) -> set[str]:
             export_current_frame=arguments.export_current_frame,
             use_selection=arguments.use_selection,
             export_animations=arguments.export_animations,
+            export_all_influences=arguments.export_all_influences,
         )
 
     if bpy.app.version < (4,):
@@ -150,6 +152,7 @@ def __invoke_export_scene_gltf(arguments: ExportSceneGltfArguments) -> set[str]:
             use_selection=arguments.use_selection,
             export_animations=arguments.export_animations,
             export_rest_position_armature=arguments.export_rest_position_armature,
+            export_all_influences=arguments.export_all_influences,
         )
 
     return bpy.ops.export_scene.gltf(
@@ -162,6 +165,7 @@ def __invoke_export_scene_gltf(arguments: ExportSceneGltfArguments) -> set[str]:
         export_animations=arguments.export_animations,
         export_rest_position_armature=arguments.export_rest_position_armature,
         export_try_sparse_sk=arguments.export_try_sparse_sk,
+        export_all_influences=arguments.export_all_influences,
     )
 
 

src/io_scene_vrm/locale/ja_jp.py

@@ -72,6 +72,10 @@
         + " (Exported meshes can be corrupted)",
     ): "開発中のFB_ngon_encodingエクステンションを試してみる"
     + "(エクスポートされるメッシュが壊れることがあります)",
+    (
+        "*",
+        "Export All Bone Influences (Don't limit to 4, most viewers truncate to 4, so bone movement may cause jagged meshes)",
+    ): "全てのボーンウェイトをエクスポートする(4つに制限しない。多くのビューアは4つに制限するため、ボーンの動きがメッシュを乱す可能性があります)",
     (
         "*",
         "No error. Ready for export VRM",