[vtkusers] Why GetNumberOfCells return 0

[Guido Ioele]

Hi all,
could you give me an aswer for this:
......
vtkConeSource *cone = vtkConeSource::New();
    cone->SetResolution(16);
    cone->SetRadius(3.0);
    cone->SetHeight(7.0);
int cells;
cells=cone->GetOutput()->GetNumberOfCells();
cout<<cells;
...........
Why I retrieve cells=0 ?

Thanks in advance
Guido

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Guido Ioele
Electronic Engineer

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