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void AngleVectors (const QAngle &angles, Vector *forward, Vector *right, Vector *up){	Assert( s_bMathlibInitialized );	float sr, sp, sy, cr, cp, cy;		SinCos( DEG2RAD( angles[YAW] ), &sy, &cy );	SinCos( DEG2RAD( angles[PITCH] ), &sp, &cp );	SinCos( DEG2RAD( angles[ROLL] ), &sr, &cr );	if (forward)	{		forward->x = cp*cy;		forward->y = cp*sy;		forward->z = -sp;	}	if (right)	{		right->x = (-1*sr*sp*cy+-1*cr*-sy);		right->y = (-1*sr*sp*sy+-1*cr*cy);		right->z = -1*sr*cp;	}	if (up)	{		up->x = (cr*sp*cy+-sr*-sy);		up->y = (cr*sp*sy+-sr*cy);		up->z = cr*cp;	}}