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Summary: davnov134 found that the algorithm crashes if X is an axis-aligned plane. This is because I implemented scaling control points by `X.std()` as a poor man’s version of PCA whitening. I checked that it does not bring consistent improvements, so let’s get rid of it. The algorithm still results in slightly higher errors on the axis aligned planes but at least it does not crash. As a next step, I will experiment with detecting a planar case and using 3-point barycentric coordinates rather than 4-points. Reviewed By: davnov134 Differential Revision: D21179968 fbshipit-source-id: 1f002fce5541934486b51808be0e910324977222