94ca3aea83
- Only calculate the necessary normals based on smooth/flat/mixed shading - Use cached face normals instead of computing them - Use a `VectorSet` for deduplication instead of a `Map` - Deduplicate vertex normals and store indices in separate loops - Avoid unnecessary duplication of face normal indices - Inline simple function for slicing index span Export time (ms) of 1.8m vertex mesh: | Normals Domain | Before | After | | --------------- | ------ | ----- | | Face (flat) | 559 | 469 | | Vertex (smooth) | 659 | 466 | | Corner (mixed) | 656 | 640 | The change of using normals from different domains and using a VectorSet for de-duplication change the order of normals in the OBJ files. Other than that, the results should be unchanged. Fixes #117510 Pull Request: https://projects.blender.org/blender/blender/pulls/117522
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