Merge pull request #2375 from ousttrue/fix/workaround_urp_editor_import

URP プロジェクトで matcap を含むモデルを Editor import するとエラーになるのを回避(暫定)

Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/TextureExtractor.cs

@@ -59,7 +59,8 @@ public void Extract(SubAssetKey key, TextureDescriptor texDesc)
             }
             else
             {
-                throw new Exception($"{key} is not converted.");
+                // throw new Exception($"{key} is not converted.");
+                Debug.LogWarning($"{key} is not converted.");
             }
         }