glTF importer: add hook before gltf import

io_scene_gltf2/__init__.py

@@ -4,7 +4,7 @@
 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": (3, 4, 36),
+    "version": (3, 4, 37),
     'blender': (3, 3, 0),
     'location': 'File > Import-Export',
     'description': 'Import-Export as glTF 2.0',

io_scene_gltf2/blender/imp/gltf2_blender_gltf.py

@@ -6,6 +6,7 @@ from mathutils import Vector, Quaternion, Matrix
 from .gltf2_blender_scene import BlenderScene
 from ..com.gltf2_blender_ui import gltf2_KHR_materials_variants_variant, gltf2_KHR_materials_variants_primitive, gltf2_KHR_materials_variants_default_material
 from .gltf2_blender_material import BlenderMaterial
+from io_scene_gltf2.io.imp.gltf2_io_user_extensions import import_user_extensions
 
 
 class BlenderGlTF():
@@ -16,6 +17,9 @@ class BlenderGlTF():
     @staticmethod
     def create(gltf):
         """Create glTF main method, with optional profiling"""
+
+        import_user_extensions('gather_import_gltf_before_hook', gltf)
+
         profile = bpy.app.debug_value == 102
         if profile:
             import cProfile, pstats, io