Aras Pranckevicius
cf8922ef57
The new OBJ importer is producing "sharp" edges on some meshes that should be completely smooth. Only observed on UV-Sphere type meshes so far (see T97820). I'm not 100% sure what is the root cause, but my theory was that maybe due to limited number of float digits that are printed for vertex normals in the file, the normals that are read in are not always exactly 1.0 length. And then the Blender's "set custom loop normals" function (which expects normalized inputs) wrongly marks some edges as sharp. Adding explicit normalization for the normals that are read from the file fixes the wrongly-sharp edges in test cases from T97820. I have not observed measurable performance impact in importing large models (e.g. 6-level subdivided Monkey) that contain vertex normals. Reviewed By: Howard Trickey Differential Revision: https://developer.blender.org/D15202
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