[vtkusers] Selecting/Extracting cells using points

[David Doria]

When using vtkSelectionNode and vtkExtractSelection to extract a piece
of a vtkPolyData by selectin point ids, is there anyway to get the
cells that exist completely on the remaining points to come along for
the ride? This code:

http://www.vtk.org/Wiki/VTK/Examples/Broken/ExtractCellsUsingPoints

currently seems to generate a vertex for each point but lose all of
the polygonal cells. Anyone know how to do this?

Thanks,

David