glTF exporter: set udim material names with tile number

scripts/addons_core/io_scene_gltf2/__init__.py

@@ -5,7 +5,7 @@
 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": (4, 3, 17),
+    "version": (4, 3, 18),
     'blender': (4, 2, 0),
     'location': 'File > Import-Export',
     'description': 'Import-Export as glTF 2.0',

scripts/addons_core/io_scene_gltf2/blender/exp/primitive_extract.py

@@ -773,8 +773,8 @@ class PrimitiveCreator:
                             self.export_settings['log'].warning(
                                 'We are not managing this case (UDIM for {})'.format(tex))
 
-                    self.additional_materials.append(
-                        (new_material, material_info, int(str(id(base_material)) + str(u) + str(v))))
+                    self.additional_materials.append((new_material, material_info, int(
+                        str(id(base_material)) + str(u) + str(v)), "10" + str(v) + str(u + 1)))
 
         # Now, we need to add additional Vertex Color if needed
         if self.export_settings['gltf_all_vertex_colors'] is True:

scripts/addons_core/io_scene_gltf2/blender/exp/primitives.py

@@ -75,7 +75,7 @@ def gather_primitives(
                 export_settings)
         else:
             # UDIM case
-            base_material, material_info, unique_material_id = udim_material
+            base_material, material_info, unique_material_id, tile = udim_material
             material = get_final_material(
                 blender_mesh,
                 unique_material_id,
@@ -84,6 +84,9 @@ def gather_primitives(
                 material_info["uv_info"],
                 export_settings)
 
+            # Force change name of material to get the tile number in the name
+            material.name = material.name + "." + tile
+
         primitive = gltf2_io.MeshPrimitive(
             attributes=internal_primitive['attributes'],
             extensions=__gather_extensions(