[vtkusers] create a vtkPolydata for a region (area)

[cerina]

Hi all,
I tried , when i pick on the mesh, to create a polydata from all cells which
belongs to this region, but it didn't work, and the progam is blocked. Is
there any body who can correct my code:

 vtkSmartPointer<vtkIdTypeArray> idss =
vtkSmartPointer<vtkIdTypeArray>::New();
	  
	   for(int cc=0; cc<polydata->GetNumberOfCells();cc++)
	   {
		   if(PointsNode->GetValue(cc)==region)
		   {
	   idss->SetNumberOfComponents(1);
            idss->InsertNextValue(cc);
				   }
	   }
		   vtkSmartPointer<vtkSelectionNode> selectionNode =
                vtkSmartPointer<vtkSelectionNode>::New();
            selectionNode->SetFieldType(vtkSelectionNode::CELL);
            selectionNode->SetContentType(vtkSelectionNode::INDICES);
            selectionNode->SetSelectionList(idss);

            vtkSmartPointer<vtkSelection> selection =
                vtkSmartPointer<vtkSelection>::New();
            selection->AddNode(selectionNode);

            vtkSmartPointer<vtkExtractSelection> extractSelection =
                vtkSmartPointer<vtkExtractSelection>::New();

			extractSelection->SetInput(0, this->reader->GetOutput());
            extractSelection->SetInput(1, selection);
            extractSelection->Update();

            selected->ShallowCopy(extractSelection->GetOutput());

            vtkSmartPointer<vtkPolyData> newdata =
                vtkSmartPointer<vtkPolyData>::New();
            newdata->SetPoints(selected->GetPoints());

            newdata->SetPolys(selected->GetCells());

			 int numberOfSubdivisions = 1;

            vtkSmartPointer< vtkLoopSubdivisionFilter > subdivisionFilter =
                vtkSmartPointer<vtkLoopSubdivisionFilter>::New();
           
subdivisionFilter->SetNumberOfSubdivisions(numberOfSubdivisions);
            subdivisionFilter->SetInput(newdata);

Best regards,
Cerina



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