[vtkusers] Create 3-D surface from 2-D contours of slices

[shengweng]

 I have tried the method before, but I could only display the contours, and
could not get surface.
 The following code you pointed out generated the PolyData explicitly, but
the ContourWidget create the PolyData implicitly, I don't know how to check
if the contours are stored in the PolyData correctly and there were points
and lines, no vertex,cells in the PolyData.
  How to incorporate the 2-D contours including points and lines with
z-depth(slice dimension) and then convert them into effective PolyData with
x,y,z values?

  

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