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matrix_to_quat - Constructs a quaternion from a rotation matrix. Allegro game programming library.
#include <allegro.h> void matrix_to_quat(const MATRIX_f *m, QUAT *q);
Constructs a quaternion from a rotation matrix. Translation is discarded during the conversion. Use get_align_matrix_f() if the matrix is not orthonormalized, because strange things may happen otherwise.