public class Vertex {
	public Vector3D pt,v;
	public Vertex(Vector3D ptt,Vector3D vv) {
		pt = ptt;
		v = vv;
	}
	public Vertex(Vector3D ptt) {
		this(ptt,new Vector3D(false));
	}
	public Vertex() {
		this(new Vector3D(true));
	}
}