glTF exporter: add gather_joint_hook for user extensions

io_scene_gltf2/__init__.py

@@ -15,7 +15,7 @@
 bl_info = {
     'name': 'glTF 2.0 format',
     'author': 'Julien Duroure, Norbert Nopper, Urs Hanselmann, Moritz Becher, Benjamin Schmithüsen, Jim Eckerlein, and many external contributors',
-    "version": (1, 3, 12),
+    "version": (1, 3, 13),
     'blender': (2, 90, 0),
     'location': 'File > Import-Export',
     'description': 'Import-Export as glTF 2.0',
@@ -26,7 +26,6 @@ bl_info = {
     'category': 'Import-Export',
 }
 
-
 def get_version_string():
     return str(bl_info['version'][0]) + '.' + str(bl_info['version'][1]) + '.' + str(bl_info['version'][2])
 
@@ -569,6 +568,7 @@ class GLTF_PT_export_include(bpy.types.Panel):
         col.prop(operator, 'export_cameras')
         col.prop(operator, 'export_lights')
 
+
 class GLTF_PT_export_transform(bpy.types.Panel):
     bl_space_type = 'FILE_BROWSER'
     bl_region_type = 'TOOL_PROPS'

io_scene_gltf2/blender/exp/gltf2_blender_gather_joints.py

@@ -20,6 +20,7 @@ from io_scene_gltf2.io.com import gltf2_io
 from io_scene_gltf2.blender.exp import gltf2_blender_extract
 from io_scene_gltf2.blender.com import gltf2_blender_math
 from io_scene_gltf2.blender.exp import gltf2_blender_gather_skins
+from io_scene_gltf2.io.exp.gltf2_io_user_extensions import export_user_extensions
 from ..com.gltf2_blender_extras import generate_extras
 
 @cached
@@ -66,7 +67,7 @@ def gather_joint(blender_object, blender_bone, export_settings):
                 children.append(gather_joint(blender_object, blender_bone.id_data.pose.bones[bone], export_settings))
 
     # finally add to the joints array containing all the joints in the hierarchy
-    return gltf2_io.Node(
+    node = gltf2_io.Node(
         camera=None,
         children=children,
         extensions=None,
@@ -81,6 +82,10 @@ def gather_joint(blender_object, blender_bone, export_settings):
         weights=None
     )
 
+    export_user_extensions('gather_joint_hook', export_settings, node, blender_bone)
+
+    return node
+
 def __gather_extras(blender_bone, export_settings):
     if export_settings['gltf_extras']:
         return generate_extras(blender_bone.bone)