public bool WouldBeClipped(ClipPlane cp)
 {
     return(Clipper.WouldBeClipped(original_verts, cp));
 }
 public void ClipFacePlane(ClipPlane cp)
 {
     clipped_verts = Clipper.ClipToPlane(original_verts, cp)
                     .Cast <CVertex>()
                     .ToArray();
 }