[vtkusers] extracting cells

[Tasnim]

Hi vtkUsers,
i tried to extract cells from my mesh, based on this example:
http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/ExtractCellsUsingPoints
<http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/ExtractCellsUsingPoints>  
and i tried to select ids from 10 to 40 :
for(vtkIdType i = 10; i < 40; i++)
    {
    ids->InsertNextValue(i);
    }
then i create a ply file from this selection, but i found that the
extraction begins from the Id 0 not from 10!!!
Is it possible to realize my idee!! if yes, how can i correct my code??

Thanks



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