public double Dist2(Vect3 p2)
{
return((p2.x - x) * (p2.x - x) + (p2.y - y) * (p2.y - y) + (p2.z - z) * (p2.z - z));
}
public double Dot(Vect3 v)
{
return(x * v.x + y * v.y + z * v.z);
}
public Vect3(Vect3 p1, Vect3 p2)
{
x = p2.x - p1.x;
y = p2.y - p1.y;
z = p2.z - p1.z;
}