Provided by: allegro4-doc_4.4.2-4_all

**NAME**

apply_quat - Multiplies a point by a quaternion. Allegro game programming library.

**SYNOPSIS**

#include<allegro.h>voidapply_quat(constQUAT*q,floatx,y,z,*xout,*yout,*zout);

**DESCRIPTION**

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().