+ vtkSmartPointer<vtkMultiBlockDataGroupFilter> mb(vtkSmartPointer<vtkMultiBlockDataGroupFilter>::New());
+ vtkSmartPointer<vtkCompositeDataToUnstructuredGridFilter> cd(vtkSmartPointer<vtkCompositeDataToUnstructuredGridFilter>::New());
+ mb->AddInputConnection(thres1->GetOutputPort());
+ mb->AddInputConnection(thres2->GetOutputPort());
+ cd->SetInputConnection(mb->GetOutputPort());
+ cd->SetMergePoints(0);
+ cd->Update();
+ output->ShallowCopy(cd->GetOutput());