d0d4fc45b3
The FBX SDK specifies that normals should use the IndexToDirect FBX reference mode. This mode allows data written to FBX to be deduplicated by writing a separate array of indices into the deduplicated array of data that can be used to reconstruct the full array of data. When Unity imports per-vertex normals with the IndexToDirect reference mode, it erroneously considers the imported mesh's normals invalid if any of its normals were deduplicated. This issue is not present in other external software that I have tested. This patch modifies the export of per-vertex normals to not perform any deduplication, avoiding the issue in Unity's FBX importer while maintaining use of the IndexToDirect reference mode. The add-on's patch version has been increased. Pull Request: https://projects.blender.org/blender/blender/pulls/123186
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