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Summary:
Allow a line like `OFF10 10 10` as the start of an OFF file. Such things apparently occur in ModelNet40.

This resolves https://github.com/facebookresearch/pytorch3d/issues/663.

Pull Request resolved: https://github.com/facebookresearch/pytorch3d/pull/665

Test Plan: New test

Reviewed By: nikhilaravi

Differential Revision: D28180006

Pulled By: bottler

fbshipit-source-id: 7f474c6a262e32da012217e09f76e8672a7f0278

Summary: Implements the ascii OFF file format. This was discussed in https://github.com/facebookresearch/pytorch3d/issues/216

Reviewed By: theschnitz

Differential Revision: D25788834

fbshipit-source-id: c141d1f4ba3bad24e3c1f280a20aee782bfd74d6