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Jeremy Reizenstein authored
Summary: If offset_verts_ is used to move meshes with a single vector, the normals won't change so don't need to recalculate. I am planning to allow user-specified vertex normals. This change means that user-specified vertex normals won't get overwritten when they don't need to be. Reviewed By: nikhilaravi Differential Revision: D27765256 fbshipit-source-id: f6e4d308ac9ac023030325cb75a18d39b966cf88
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