private PathFigure3D(int unused)
 {
     Segments = new PathSegment3DCollection();
     Segments.Add(new PolyLineSegment3D());
 }
 /// <summary>
 /// 
 /// </summary>
 public PathFigure3D()
 {
     figFlattened = new PathFigure3D(0);
     Segments = new PathSegment3DCollection();
 }