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Questions regarding built-in methods to rotate objects and how to perform them: Rotate, RotationTransform, ImageRotate, RotationMatrix etc.
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Axis/Angle from rotation matrix
With r = RotationMatrix[a, {x, y, z}] I can compute a 3D rotation matrix from its axis/angle representation.
Given a 3D rotation matrix r, how can I compute a and {x, y, z}? …