[vtkusers] Write a PolygonPolydata

[Nens]

Hi,

yes, "imgstenc->GetSurface()" was an error. I replace it by
"imgstenc->GetOutput()" but nothing change and I only get a black image.
Like my code can not get the polygon.

By the way, "cout << edges->GetOutput()->GetNumberOfCells() << endl;" return
an positive value which depend of the number of click made by user.
I think that mean that my polygon isn't close.
Maybe it is the problem.



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