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Utils for clipping mesh faces partially behind the image plane
Summary: Instead of culling faces behind the camera, partially clip them if they intersect with the image plane. This diff implements the utils functions for clipping. There are 4 cases for the mesh faces which are all handled: ``` Case 1: the triangle is completely in front of the clipping plane (it is left unchanged) Case 2: the triangle is completely behind the clipping plane (it is culled) Case 3: the triangle has exactly two vertices behind the clipping plane (it is clipped into a smaller triangle) Case 4: the triangle has exactly one vertex behind the clipping plane (it is clipped into a smaller quadrilateral and divided into two triangular faces) ``` Reviewed By: jcjohnson Differential Revision: D23108673 fbshipit-source-id: 550a8b6a982d06065dff10aba10d47e8b144ae52
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