[vtkusers] how to reconstruct surface of hollow solid??

[6dgis at 163.com]

Hi, all
	I am trying to reconstruct the surface of 3D Solid from some contourlines. Each contourlines is 
consisting of some 3D points (x0, y0, z0) in orders. However, the 3D solid may hollow, that the contourlines
may be as following:

	 xxxxxxxxxxxxxxx
	xx			   xx
    x        ssss    xx
    x       s   s     x
　　xxxx   ssssss     x
        xx        xxxx
          xxx    xx
             xxxxx


'x' indicates a point of the outer contourline, while 's' indicates a point of the inner contourline.
when reconstructing surface of hollow solid, how to rebuild inner surface? Thanks in advance!:)

　　　　　6dgis
　　　　　　　　6dgis at 163.com
　　　　　　　　　　2005-08-01