[vtkusers] How to get the boundary points for a PolyData (Unstructured)

[Kiran, P (CORP, GEITC)]

Hi all,

Is there any available mathods in vtk to get  boundary points for a 3-D
Polydata (unstructured).
I tried the following pipeline, but no luck.
vtkFeatureEdges -> vtkPolyDataMapper -> vtkActor ->vtkRenderer

whether vtkFeatureEdges requires some kind of surface generated from
PolyData,  as it's input?

Thanks in advance for help.
-Kiran