Only for FBX export from CAD ?
<<< Some tools, in particular CAD ones, tends to generate awful ugly geometries when tessellating their objects into meshes (very thin and long triangles, etc.). Auto-computed normals on such geometry often gives bad artifacts, so it is important to be able to import and use the normals as generated by the CAD tool itself.
There is now the needed helpers in Blender RNA, which allows import scripts to set custom normals from read data. Currently, only FBX importer uses it.
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