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

[leandro]

Hello, i bring this topic back to life, 'cause I got the same issue.
The problem is that the way we get the Polydata from the widget
representation. vtkVoxelContoursToSurfaceFilter wants the contours as Polys,
but GetContourRepresentationAsPolyData() returns contours as Lines =(

I also tried with the vtkImageTracerWidget (wich i actually prefer to use),
but get exact the same problem.

I get the contours correctly fusioned with vtkAppendPolyData, correctly
positioned, also in relation to the CT volume, just cannot make them into a
volume yet.

pipeline is like:
Get Polydata from vtkContourWidget (or vtkImageTracerWidget) ->
vtkAppendPolyData -> vtkVoxelContoursToSurfaceFilter

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