[vtkusers] vtkPolyDataNormals adds points??

[David Doria]

Is there any reason points would be added in the following code?
        cout << "Points before filter: " << polydata->GetNumberOfPoints() <<
endl;
        vtkSmartPointer<vtkPolyDataNormals> normalGenerator =
vtkSmartPointer<vtkPolyDataNormals>::New();
        normalGenerator->SetInput(polydata);
        normalGenerator->SetComputePointNormals(1);
        normalGenerator->SetComputeCellNormals(0);
        normalGenerator->Update();
        polydata = normalGenerator->GetOutput();
        cout << "Points after filter: " << polydata->GetNumberOfPoints() <<
endl;

The output is:
Points before filter: 502
Points after filter: 872

Thanks,

David
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