glTF exporter: fix texture image export when extension is uppercase

1 files changed, 2 insertions, 0 deletions

diff --git a/io_scene_gltf2/blender/exp/gltf2_blender_gather_image.py b/io_scene_gltf2/blender/exp/gltf2_blender_gather_image.py
index 71913034..cb4a03c6 100755
--- a/io_scene_gltf2/blender/exp/gltf2_blender_gather_image.py
+++ b/io_scene_gltf2/blender/exp/gltf2_blender_gather_image.py
@@ -81,6 +81,7 @@ def __gather_mime_type(sockets_or_slots, export_settings):
     if export_settings["gltf_image_format"] == "NAME":
         image_name = __get_texname_from_slot(sockets_or_slots, export_settings)
         _, extension = os.path.splitext(image_name)
+        extension = extension.lower()
         if extension in [".jpeg", ".jpg", ".png"]:
             return {
                 ".jpeg": "image/jpeg",
@@ -99,6 +100,7 @@ def __gather_name(sockets_or_slots, export_settings):
     image_name = __get_texname_from_slot(sockets_or_slots, export_settings)
 
     name, extension = os.path.splitext(image_name)
+    extension = extension.lower()
     if extension in [".jpeg", ".jpg", ".png"]:
         return name
     return image_name