glTF exporter: add new animation hooks

io_scene_gltf2/__init__.py

@@ -15,7 +15,7 @@
 bl_info = {
     'name': 'glTF 2.0 format',
     'author': 'Julien Duroure, Scurest, Norbert Nopper, Urs Hanselmann, Moritz Becher, Benjamin Schmithüsen, Jim Eckerlein, and many external contributors',
-    "version": (1, 8, 17),
+    "version": (1, 8, 18),
     'blender': (3, 1, 0),
     'location': 'File > Import-Export',
     'description': 'Import-Export as glTF 2.0',

io_scene_gltf2/blender/exp/gltf2_blender_export.py

@@ -64,7 +64,7 @@ def __export(export_settings):
     buffer = __create_buffer(exporter, export_settings)
     exporter.finalize_images()
 
-    export_user_extensions('gather_gltf_hook', export_settings, exporter.glTF)
+    export_user_extensions('gather_gltf_extensions_hook', export_settings, exporter.glTF)
     exporter.traverse_extensions()
 
     # now that addons possibly add some fields in json, we can fix in needed
@@ -80,6 +80,8 @@ def __gather_gltf(exporter, export_settings):
         gltf2_io_draco_compression_extension.encode_scene_primitives(scenes, export_settings)
         exporter.add_draco_extension()
 
+    export_user_extensions('gather_gltf_hook', export_settings, active_scene_idx, scenes, animations)
+
     for idx, scene in enumerate(scenes):
         exporter.add_scene(scene, idx==active_scene_idx)
     for animation in animations:

io_scene_gltf2/blender/exp/gltf2_blender_gather_animations.py

@@ -122,6 +122,8 @@ def __gather_animation(blender_action: bpy.types.Action,
         print_console("WARNING", "Animation '{}' could not be exported. Cause: {}".format(name, error))
         return None
 
+    export_user_extensions('pre_gather_animation_hook', export_settings, animation, blender_action, blender_object)
+
     if not animation.channels:
         return None
 
@@ -216,6 +218,8 @@ def __get_blender_actions(blender_object: bpy.types.Object,
     blender_tracks = {}
     action_on_type = {}
 
+    export_user_extensions('pre_gather_actions_hook', export_settings, blender_object)
+
     if blender_object.animation_data is not None:
         # Collect active action.
         if blender_object.animation_data.action is not None:
@@ -258,6 +262,8 @@ def __get_blender_actions(blender_object: bpy.types.Object,
                         blender_tracks[strip.action.name] = track.name # Always set after possible active action -> None will be overwrite
                         action_on_type[strip.action.name] = "SHAPEKEY"
 
+    export_user_extensions('gather_actions_hook', export_settings, blender_object, blender_actions, blender_tracks, action_on_type)
+
     # Remove duplicate actions.
     blender_actions = list(set(blender_actions))
     # sort animations alphabetically (case insensitive) so they have a defined order and match Blender's Action list