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matrix_to_quat(3alleg4) 					  Allegro manual					   matrix_to_quat(3alleg4)

NAME
       matrix_to_quat - Constructs a quaternion from a rotation matrix. Allegro game programming library.

SYNOPSIS
       #include <allegro.h>

       void matrix_to_quat(const MATRIX_f *m, QUAT *q);

DESCRIPTION
       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.

Allegro 							   version 4.4.2					   matrix_to_quat(3alleg4)