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Campbell Barton 4cadccebfa Revert "Mesh: replace saacos with acosf for normal calculation" ...

This reverts commit 41e6509818.

This broke "CubeMaskFirst" test.

Any value even slightly outside the [-1.0..1.0] range
caused the result to be nan, which can happen when calculating
the dot-product between two unit length vectors.

2021-08-13 19:45:01 +10:00

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