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apply_quat(3)                   Allegro manual                   apply_quat(3)

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

SYNOPSIS
       #include <allegro.h>

       void apply_quat(const QUAT *q, float x, 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().

Allegro                          version 4.4.2                   apply_quat(3)