vtkOBJImporter + LOD based rendering

    vtkOBJImporter *obImporter = vtkOBJImporter::New();
    obImporter->SetFileName(filename.c_str());
    obImporter->SetFileNameMTL(filenameMtl.c_str());
    obImporter->SetTexturePath(texturePath.c_str());

    // A renderer and render window
    vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
    renderer->SetBackground(0.2, 0.3, 0.3);
    vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
    renderWindow->AddRenderer(renderer);

    // An interactor
    vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<
        vtkRenderWindowInteractor>::New();
    renderWindowInteractor->SetRenderWindow(renderWindow);
    renderWindowInteractor->SetDesiredUpdateRate(15);

    vtkSmartPointer<KeyPressInteractorStyle> style = vtkSmartPointer<KeyPressInteractorStyle>::New();
    renderWindowInteractor->SetInteractorStyle(style);
    style->SetCurrentRenderer(renderer);

    obImporter->SetRenderWindow(renderWindow);
    obImporter->Read();

    renderWindow->Render();
    renderWindowInteractor->Start();