[vtkusers] How to separate different surface of solids

[6dgis at 163.com]

Hi, all
	I am trying to construct surface from contours using vtkMarchingCubes, but how to separate different surface of solids?
for example, A solid may have two hollows, I have construct two surfaces of the hollows, but how to separate them from the 
results of vtkMarchingCubes? Any help? Thx in advance!:) 
 				

　　　　　　　　6dgis
　　　　　　　　6dgis at 163.com
　　　　　　　　　　2005-08-06