public static Vector Cross(Normal v1, Vector v2) { return v1.Cross(v2); }
public static Vector Cross(Vector v1, Normal v2) { return v2.Cross(v1); }
public static Vector Cross(Normal v1, Vector v2) { return v1.Cross(v2); }
public static Vector Cross(Vector v1, Normal v2) { return v2.Cross(v1); }