public Vector3Limiter ()
		{
			x = new FieldLimiter<double> ();
			y = new FieldLimiter<double> ();
			z = new FieldLimiter<double> ();
		}
		public PointLimiter ()
		{
			x = new FieldLimiter<double> ();
			y = new FieldLimiter<double> ();
			z = new FieldLimiter<double> ();
		}