void AngleVectors( const vec3_t angles, vec3_t forward,
                         vec3_t right,  vec3_t up ) {
	float angle;
	static float sp, sy, cp, cy, sr, cr;
	// static to help MS compiler fp bugs

	angle = DEG2RAD( angles[PITCH] );
	sp = sin( angle );
	cp = cos( angle );

	angle = DEG2RAD( angles[YAW] );
	sy = sin( angle );
	cy = cos( angle );

	if( forward ) {
		forward[0] = cp*cy;
		forward[1] = cp*sy;
		forward[2] = -sp;
	}
	if( right || up ) {
		angle = DEG2RAD( angles[ROLL] );
		sr = sin( angle );
		cr = cos( angle );

		if( right ) {
			right[0] = -1*sr*sp*cy+-1*cr*-sy;
			right[1] = -1*sr*sp*sy+-1*cr*cy;
			right[2] = -1*sr*cp;
		}
		if( up ) {
			up[0] = cr*sp*cy+-sr*-sy;
			up[1] = cr*sp*sy+-sr*cy;
			up[2] = cr*cp;
		}
	}
}