Hi Peter- Look at the filter vtkFeatureEdges. Will At 10:05 AM 10/2/2001 +0200, Sylvain Jaume wrote: >On Tue, 2 Oct 2001, Peter Gall wrote: > > > Hi > > > > Is the information about the boudary vertices in PolyData already contained > > in the PolyData structure? Is there a short way to get them ? > > > > thanks > > Peter