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You might find some clues by looking at a pure trig solution to the problem in Rotate a 3D vector. Maybe try to compare outputs for similar inputs, and see where your logic/math error is? One big error to watch out for is degree/rad mixups.

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In reply to Re: Cartesian co-ordinate rotation around an Axis by zentara
in thread Cartesian co-ordinate rotation around an Axis by fraizerangus

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