void ReadandShowVTKFile ()

{

     vtkSmartPointer<vtkRenderer > aRenderer =

          vtkSmartPointer<vtkRenderer >::New();

     vtkSmartPointer<vtkRenderWindow > renWin =

          vtkSmartPointer<vtkRenderWindow >::New();

     renWin->AddRenderer (aRenderer);

     vtkSmartPointer<vtkRenderWindowInteractor > iren =

         vtkSmartPointer<vtkRenderWindowInteractor >::New();

     iren->SetRenderWindow (renWin);

     vtkSmartPointer<vtkPolyDataReader > vtkReader = vtkSmartPointer<vtkPolyDataReader >::New();

     vtkReader->SetFileName ("polyline.vtk");

     vtkSmartPointer<vtkPolyDataMapper > skinMapper = vtkSmartPointer<vtkPolyDataMapper >::New();

     skinMapper->SetInputConnection (vtkReader-> GetOutputPort());

     skinMapper->ScalarVisibilityOff ();    

     vtkSmartPointer<vtkActor > skin =

          vtkSmartPointer<vtkActor >::New();

     skin->SetMapper (skinMapper);

     vtkSmartPointer<vtkCamera > aCamera =

          vtkSmartPointer<vtkCamera >::New();

     aCamera->SetViewUp (, , -);

     aCamera->SetPosition (, , );

     aCamera->SetFocalPoint (, , );

     aCamera->ComputeViewPlaneNormal ();

     aCamera->Azimuth (30.0);

     aCamera->Elevation (30.0);

     aCamera->Dolly (1.5);

     aRenderer->AddActor (skin);

     aRenderer->SetActiveCamera (aCamera);

     aRenderer->ResetCamera ();

     aRenderer->SetBackground (., ., .);

     aRenderer->ResetCameraClippingRange ();

     renWin->Render ();

     iren->Initialize ();

     iren->Start ();

}