public void ExpandSelf(element s)
{
Min.SubSelf(s);
Max.AddSelf(s);
}
public bool Contains(vector v)
{
v.SubSelf(Center);
return(Math.Abs(v.X) <= Extents.X && Math.Abs(v.Y) <= Extents.Y && Math.Abs(v.Z) <= Extents.Z);
}