[vtkusers] Isosurface: Multiple Contours??

[R T]

Hello all,
how to produce an isosurface without getting multiple contours?

         vtkContourFilter *cf = vtkContourFilter::New();
		cf->SetInput(id);
		cf->SetValue(0,60);
		cf->SetNumberOfContours(1);

This gives numerous points and cells inside  the boundary surface.

Thanks in advance

Roma

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