float angle(CVector3& v, CVector3& w) { float a = (v*w)/(v.getNorm() * w.getNorm()); return (float)float(acos(a))*180.0f/float(M_PI); }
float distance(CVector3& p1, CVector3& p2) { CVector3 z = p2 - p1; return z.getNorm(); }