[vtkusers] Getting cell ids that build surface of an unstructured grid

[Marcus Stojek]

Hi,
I'm using vtk 4.0 with python.

>From an unstructured grid I need the cell ids of the cells that
build the surface of the grid.

I have:

self.grid = vtkUnstructuredGrid()
blabla...

self.gfilter=vtkGeometryFilter()
self.gfilter.SetInput(self.grid)
self.gfilter.Update() 
test=vtkFloatArray()
self.gfilter.GetOutput().GetPolys().GetData().GetData(0,300,0,0,test)

giving me a list of the surface triangles and quads using node ids.
But I need the CELL ids. I have played with BuildLinks and vtkCellLinks
but somehow I can't make it work.
Any help?

Thanks in advance,
Marcus