[vtkusers] Number of vertices in one component

[Rachel]

Hello ,

I want to get the number of vertices and their coordinates in the largest
component, i m using the following code:

 vtkSmartPointer<vtkPolyDataConnectivityFilter> connectivityFilter = 
    vtkSmartPointer<vtkPolyDataConnectivityFilter>::New();
    connectivityFilter->SetInput(mesh); 
 connectivityFilter->SetExtractionModeToLargestRegion();
connectivityFilter->Update();
 
And i try to use the following code to extract the number but it gives me
the number of all vertices in all components

  vtkPointSet *outputPointSet = connectivityFilter->GetOutput(); 
cout<< outputPointSet->GetNumberOfPoints();

Any suggestion ? Many Thanks
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