[vtkusers] (no subject)

[tasnim]

Good morning,
I could'nt get my points from my selected cell in order to reconstruct a
vtkPolyData from it. Here is the code:

// Catch mouse events
class MouseInteractorStyle : public vtkInteractorStyleTrackballCamera
{
  public:
  static MouseInteractorStyle* New();
 
  MouseInteractorStyle()
  {
    selectedMapper = vtkSmartPointer<vtkDataSetMapper>::New();
    selectedActor = vtkSmartPointer<vtkActor>::New();
	
  }
 
    virtual void OnLeftButtonDown()
    {
      // Get the location of the click (in window coordinates)
      int* pos = this->GetInteractor()->GetEventPosition();
 
      vtkSmartPointer<vtkCellPicker> picker =
        vtkSmartPointer<vtkCellPicker>::New();
      picker->SetTolerance(0.0005);
 
      // Pick from this location.
      picker->Pick(pos[0], pos[1], 0, this->GetDefaultRenderer());
 
      double* worldPosition = picker->GetPickPosition();
      std::cout << "Cell id is: " << picker->GetCellId() << std::endl;
 
      if(picker->GetCellId() != -1)
        {
 
        std::cout << "Pick position is: " << worldPosition[0] << " " <<
worldPosition[1]
                  << " " << worldPosition[2] << endl;
 
        vtkSmartPointer<vtkIdTypeArray> ids =
          vtkSmartPointer<vtkIdTypeArray>::New();
        ids->SetNumberOfComponents(1);
        ids->InsertNextValue(picker->GetCellId());
 
        vtkSmartPointer<vtkSelectionNode> selectionNode =
          vtkSmartPointer<vtkSelectionNode>::New();
        selectionNode->SetFieldType(vtkSelectionNode::CELL);
        selectionNode->SetContentType(vtkSelectionNode::INDICES);
        selectionNode->SetSelectionList(ids);
 
        vtkSmartPointer<vtkSelection> selection =
          vtkSmartPointer<vtkSelection>::New();
        selection->AddNode(selectionNode);
 
        vtkSmartPointer<vtkExtractSelection> extractSelection =
          vtkSmartPointer<vtkExtractSelection>::New();
#if VTK_MAJOR_VERSION <= 5
        extractSelection->SetInput(0, this->Data);
        extractSelection->SetInput(1, selection);
#else
        extractSelection->SetInputData(0, this->Data);
        extractSelection->SetInputData(1, selection);
#endif
        extractSelection->Update();
 
        // In selection
        vtkSmartPointer<vtkUnstructuredGrid> selected =
          vtkSmartPointer<vtkUnstructuredGrid>::New();
        selected->ShallowCopy(extractSelection->GetOutput());
 
        std::cout << "There are " << selected->GetNumberOfPoints()
                  << " points in the selection." << std::endl;
        std::cout << "There are " << selected->GetNumberOfCells()
                  << " cells in the selection." << std::endl;

		// Construct a triangle from my selected Cell
		vtkSmartPointer<vtkPolyData> trianglePolyData =
vtkSmartPointer<vtkPolyData>::New();
		
		//////////////
		 
#if VTK_MAJOR_VERSION <= 5
        selectedMapper->SetInputConnection(
          selected->GetProducerPort());
#else
        selectedMapper->SetInputData(selected);
#endif
 
        selectedActor->SetMapper(selectedMapper);
        selectedActor->GetProperty()->EdgeVisibilityOn();
        selectedActor->GetProperty()->SetEdgeColor(1,0,0);
        selectedActor->GetProperty()->SetLineWidth(3);
 
       
this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()->AddActor(selectedActor);
 
        }
      // Forward events
      vtkInteractorStyleTrackballCamera::OnLeftButtonDown();
    }
 
    vtkSmartPointer<vtkPolyData> Data;
    vtkSmartPointer<vtkDataSetMapper> selectedMapper;
    vtkSmartPointer<vtkActor> selectedActor;
 
};
I didn't have a function for my selected cell called "selected" that gives
me my Pointids and my cell Edges, in order to use them in my triangle's
construction. Any help please, and thanks

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