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apply_quat: Multiplies a point by a quaternion. Allegro game programming library.
apply_quat - Multiplies a point by a quaternion. Allegro game
void apply_quat(const QUAT *q, float x, y, z, *xout, *yout, *zout);
Multiplies the point (x, y, z) by the quaternion q, storing the result
in (*xout, *yout, *zout). This is quite a bit slower than
apply_matrix_f(), so only use it to translate a few points. If you have
many points, it is much more efficient to call quat_to_matrix() and
then use apply_matrix_f().