[vtkusers] cleaning vtkSilhouette result

[nsarrasin]

Hi all,

I'm using vtkSilhouette on a vtkPolyData to get its contours.
It works well and you can see the result here :
http://img143.imageshack.us/img143/8783/vtksilhouette.png

Now my goal is to clean the result to extract the external contour of this
result , as if it was the shadow of the vtkPolyData.

vtkConnectivityFilter->ExtractLargestRegion() doesn't work here because
there are some auto-intersected silhouettes.

I'm quite lost on this case because I'm pretty sure it's possible but don't
know where to look.

Note that I've already posted a similar question but never find any answer,
hope sometimes someone can advice me.

Thanks by advance
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