3d7359a38f
When OBJ file contains vertex normals, this can in some cases confuse the custom loop normals code inside Blender. Since it does not simply just use custom normals, but rather projects them into "lnor space". But that "lnor space" calculation can go haywire sometimes, when degenerate faces are present in the input. Mark zero-area faces as "sharp" before doing custom normals. This will make them not try to share the "smooth fan" lnor space with other faces, and things will look correct. Previously, OBJ importer was (wrongly) always setting all faces as "sharp", which avoided this problem, but caused other issues. Pull Request: https://projects.blender.org/blender/blender/pulls/131041
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