[vtkusers] Generating Cell Data for a surface built from unstructured points

[Joseph_Winston at veritasdgc.com]

Generating Cell Data for a surface built from unstructured points

I have a surface that was built from unstructured points using the
vtkShepardMethod that contains field data.  From reading the code, it
appears that the only way that I can pick the field data is to
generate cell data for the surface since unstructured points do not
have any connectivity.  However, I have not been able to correctly
generate the cell data thus I have not been able to pick my data.

My current approach is:

   vtkPolyDataConnectivityFilter * connectivityFilter =
vtkPolyDataConnectivityFilter::New();
   connectivityFilter->SetInput(decimate->GetOutput());
   connectivityFilter->SetExtractionModeToSpecifiedRegions();
   connectivityFilter->InitializeSpecifiedRegionList();
   connectivityFilter->AddSpecifiedRegion(0);
   connectivityFilter->Update();
   cout << connectivityFilter->GetNumberOfExtractedRegions() << endl;
   connectivityFilter->Print(cout);

   vtkCellData *cellData = connectivityFilter->GetOutput()->GetCellData();
   cellData->Print(cout);

The vtkPolyDataConnectivityFilter shows that I have one region, but I don't
see any cell data.
How should I be using the vtkPolyDataConnectivityFilter?

Thanks

Jody Winston




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