public Rect3DLW(Rect3D rect)
{
min = new Point3DLW(rect.Min);
max = new Point3DLW(rect.Max);
}
static Rect3D()
{
_empty = new Rect3D(double.PositiveInfinity, double.PositiveInfinity, double.PositiveInfinity, double.NegativeInfinity, double.NegativeInfinity, double.NegativeInfinity);
}