[vtkusers] save different regions from vtkPolyDataConnectivityFilter to polydata

[azmagillian87]

Hi vtk_users!

i am trying to save the different regions i find using
vtkPolyDataConnectivityFilter to different polydata 
i thought it would be simple but i can't get it to work although i can
visualize each region or all o f them 

i use the below code after i find all regions


	connectivityFilter->SetExtractionModeToSpecifiedRegions();
	connectivityFilter->Modified();
	connectivityFilter->Update();


	cout << "\n" << connectivityFilter->GetExtractionModeAsString() << "\n";



	vtkSmartPointer<vtkPolyData> output=
		vtkSmartPointer<vtkPolyData> ::New();

	for(int i=0;i<numRegions;i++){
		
		connectivityFilter->InitializeSpecifiedRegionList();	
		connectivityFilter->AddSpecifiedRegion(i);
		connectivityFilter->Modified();
		connectivityFilter->Update();

		//copy the output
	
		output->DeepCopy(connectivityFilter->GetOutput());	
		
               int num=output->GetNumberOfPoints();
              cout<<num;


	}

output should save different region every iteration but instead it carries
the input ,i check that by printing num 


any idea?
thanks in advance!



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