public double DistanceTo(DecardPoint p)
{
double dx = p.x - x;
double dy = p.y - y;
double dz = p.z - z;
return(Math.Sqrt(dx * dx + dy * dy + dz * dz));
}
public Vector(DecardPoint A)
{
i = A.x;
j = A.y;
k = A.z;
}
public Vector(DecardPoint A, DecardPoint B)
{
i = B.x - A.x;
j = B.y - A.y;
k = B.z - A.z;
}