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Nikhila Ravi authored
Summary: Add functionality to to save an `.obj` file with associated UV textures: `.png` image and `.mtl` file as well as saving verts_uvs and faces_uvs to the `.obj` file. Reviewed By: bottler Differential Revision: D29337562 fbshipit-source-id: 86829b40dae9224088b328e7f5a16eacf8582eb5
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