public bool Overlaps(BoundingBox region)
{
return (region.Right >= Left || region.Left < Right) &&
(region.Bottom >= Top || region.Top < Bottom) &&
(region.Back >= Front || region.Front < Back);
}
public bool Contains(BoundingBox region)
{
return (region.Right >= Left && region.Left < Right) &&
(region.Bottom >= Top && region.Top < Bottom) &&
(region.Back >= Front && region.Front < Back);
}