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Amitav Baruah authored
Summary: When the camera is vertically oriented, calculating the look_at x-axis (also known as the "right" vector) does not succeed, resulting in the x-axis being placed at the origin. Adds a check to correctly calculate the x-axis if this case occurs. Reviewed By: nikhilaravi, sbranson Differential Revision: D23511859 fbshipit-source-id: ee5145cdbecdbe2f7c7d288588bd0899480cb327
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