get_align_matrix

Rotates a matrix to align it along specified coordinate vectors.

Description

void get_align_matrix(MATRIX *m, fixed xfront, yfront, zfront, fixed xup, fixed yup, fixed zup);
Rotates a matrix so that it is aligned along the specified coordinate vectors (they need not be normalized or perpendicular, but the up and front must not be equal). A front vector of 0,0,-1 and up vector of 0,1,0 will return the identity matrix.
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