Fix jpg & webp detection for udim textures

addons/io_scene_gltf2/blender/exp/material/encode_image.py

@@ -195,6 +195,16 @@ def blender_image(self, export_settings) -> Optional[bpy.types.Image]:
 
             for fill in self.fills.values():
                 return fill.image
+
+        if self.__on_happy_path_udim():
+            # Store that this image is fully exported (used to export or not not used images)
+            for fill in self.fills.values():
+                export_settings['exported_images'][fill.image.name] = 1  # Fully used
+                break
+
+            for fill in self.fills.values():
+                return fill.image
+
         return None
 
     def __on_happy_path(self) -> bool:
@@ -431,6 +441,8 @@ def __encode_from_image_tile(self, udim_image, tile, export_settings):
                     return data
 
         # We don't manage UDIM packed image, so this could not happen to be here
+        # Lets display an error
+        export_settings['log'].error("UDIM packed images are not supported for export. Please unpack them before exporting.")
 
 
 def _encode_temp_image(tmp_image: bpy.types.Image, file_format: str, export_settings) -> bytes:

addons/io_scene_gltf2/blender/exp/material/image.py

@@ -422,7 +422,7 @@ def __get_image_data_grayscale_anisotropy(sockets, results, export_settings) ->
 
 
 def __is_blender_image_a_jpeg(image: bpy.types.Image) -> bool:
-    if image.source != 'FILE':
+    if image.source not in ['FILE', 'TILED']:
         return False
     if image.filepath_raw == '' and image.packed_file:
         return image.packed_file.data[:3] == b'\xff\xd8\xff'
@@ -432,7 +432,7 @@ def __is_blender_image_a_jpeg(image: bpy.types.Image) -> bool:
 
 
 def __is_blender_image_a_webp(image: bpy.types.Image) -> bool:
-    if image.source != 'FILE':
+    if image.source not in ['FILE', 'TILED']:
         return False
     if image.filepath_raw == '' and image.packed_file:
         return image.packed_file.data[8:12] == b'WEBP'