function Triangle_to_normal( VECTOR* n, VECTOR* v1, VECTOR* v2, VECTOR *v3)
{
	
	VECTOR A,B;
	vec_set (A,vec_sub (v2, v1 ));
	vec_set (B,vec_sub (v3, v1 ));
	
	n.x = A.y * B.z - A.z * B.y ;
	n.y = A.x * B.z - A.z * B.x ;
	n.z = A.x * B.y - A.y * B.x ;
	vec_normalize(n.x,1);
}