[vtkusers] RectilinearGrid into vtkContourFilter

[ThinkFlow]

Hi,

I am trying to render the polydata that results after passing in a
vtkRectilinearGrid into vtkContourFilter. However, I keep getting a black
screen. There were a few questions like mine that were already answered, but
when I tried out those fixes, I still got a black screen. When I render the
vtkRectilinearGrid data by itself without passing it through
vtkContourFilter, it works.

    vtkRectilinearGridReader *reader = vtkRectilinearGridReader::New();

    reader->SetFileName(prefix_suffix);
    reader->Update();

    // Create a grid
    vtkSmartPointer<vtkRectilinearGrid> grid = reader->GetOutput();

    vtkContourFilter* contour = vtkContourFilter::New();

    contour->SetInput(grid);

    contour->SetNumberOfContours(3);

    contour->ComputeNormalsOn();

    contour->Update();

    vtkPolyData *smoothed_polys = contour->GetOutput();

    // calc cell normal
    vtkPolyDataNormals *triangleCellNormals= vtkPolyDataNormals::New();

    #if VTK_MAJOR_VERSION <= 5
        triangleCellNormals->SetInput(smoothed_polys);
    #else
        triangleCellNormals->SetInputData(smoothed_polys);   
    #endif

    triangleCellNormals->ComputeCellNormalsOn();
    triangleCellNormals->ComputePointNormalsOff();
    triangleCellNormals->ConsistencyOn();
    triangleCellNormals->AutoOrientNormalsOn();
    triangleCellNormals->Update(); // creates vtkPolyData

    vtkPolyDataMapper* contourMapper = vtkPolyDataMapper::New();
    contourMapper->SetInput(triangleCellNormals->GetOutput());

     vtkActor* contourActor = vtkActor::New();
     contourActor->SetMapper(contourMapper);

    // Create a renderer, render window, and interactor
    vtkRenderer* renderer = vtkRenderer::New();
    vtkRenderWindow *renderWindow = vtkRenderWindow::New();
    vtkRenderWindowInteractor *renderWindowInteractor =
vtkRenderWindowInteractor::New();

    // Add the actors to the scene
    renderWindow->AddRenderer(renderer);
    renderWindowInteractor->SetRenderWindow(renderWindow);
    renderer->AddActor(contourActor);

    // Render and interact
    renderWindow->Render();
    renderWindowInteractor->Start();

Thanks,

Naoki



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