[vtkusers] Rendering multiple objects in one render window

[WangQ]

Hello there, 
I am quite new to VTK, and I am trying to render a volume and an isosurface in one render window using viewpoint. I follow the example of http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/StructuredDataTypes but no luck so far. Here is the code I wrote. Could anyone help to figure out where is wrong? 
Would appreciate any help.

               // Create an image data        vtkSmartPointer<vtkImageData> imageData =            vtkSmartPointer<vtkImageData>::New();				// load data here
        // Define viewport ranges        double upperViewport[4] = {0.0, 0.0, 1.0, 0.5};        double centerViewport[4] = {0.0, 0.5, 1.0, 1.0};
        // create render window        vtkSmartPointer<vtkRenderWindow> renWin = vtkSmartPointer<vtkRenderWindow>::New();        vtkSmartPointer<vtkRenderWindowInteractor> iren =            vtkSmartPointer<vtkRenderWindowInteractor>::New();        renWin->SetSize(1200, 600);        renWin->Render();        renWin->SetWindowName("Volume Clipping");        iren->SetRenderWindow(renWin);
        /****************************************************************                 create volume renderer to render stacked tomograms        ****************************************************************/         vtkSmartPointer<vtkSmartVolumeMapper> volumeMapper =            vtkSmartPointer<vtkSmartVolumeMapper>::New();        volumeMapper->SetBlendModeToComposite(); // composite first        volumeMapper->SetInputData(imageData);        volumeMapper->SetInterpolationModeToLinear();        volumeMapper->SetRequestedRenderModeToGPU();
        vtkSmartPointer<vtkVolumeProperty> volumeProperty =            vtkSmartPointer<vtkVolumeProperty>::New();        volumeProperty->SetInterpolationType(VTK_LINEAR_INTERPOLATION);        volumeProperty->ShadeOff();
        vtkSmartPointer<vtkColorTransferFunction> color =            vtkSmartPointer<vtkColorTransferFunction>::New();        //color->SetColorSpaceToRGB();        color->AddRGBPoint(0.0, 0.0, 0.0, 1.0);        color->AddRGBPoint(0.25, 0.0, 1.0, 1.0);        color->AddRGBPoint(0.5, 0.0, 1.0, 0.0);        color->AddRGBPoint(0.75, 1.0, 1.0, 0.0);        color->AddRGBPoint(1.0, 1.0, 0.0, 0.0);        color->SetScaleToLinear();        volumeProperty->SetColor(color);
        vtkSmartPointer<vtkPiecewiseFunction> compositeOpacity =            vtkSmartPointer<vtkPiecewiseFunction>::New();        compositeOpacity->AddPoint(-1.0, 0.0);        compositeOpacity->AddPoint(0.0, 0.0);        compositeOpacity->AddPoint(0.39, 0.4);        compositeOpacity->AddPoint(0.4, 0.8);        compositeOpacity->AddPoint(1.0, 1.0);        volumeProperty->SetScalarOpacity(compositeOpacity);		        vtkSmartPointer<vtkVolume> volume =            vtkSmartPointer<vtkVolume>::New();        volume->SetMapper(volumeMapper);        volume->SetProperty(volumeProperty);
        vtkSmartPointer<vtkRenderer> volumeRenderer = vtkSmartPointer<vtkRenderer>::New();        renWin->AddRenderer(volumeRenderer);        volumeRenderer->SetViewPoint(upperViewport); // position volume rendering at upper part        volumeRenderer->SetBackground(0.4, 0.5, 0.6);
        vtkSmartPointer<vtkScalarBarWidget> scalarWidget =            vtkSmartPointer<vtkScalarBarWidget>::New();        scalarWidget->SetInteractor(iren);        scalarWidget->GetScalarBarActor()->SetTitle("Concentration");        scalarWidget->GetScalarBarActor()->SetLookupTable(color);        scalarWidget->GetScalarBarActor()->SetOrientationToHorizontal();        scalarWidget->RepositionableOn();        scalarWidget->ResizableOn();        scalarWidget->EnabledOn();
        vtkSmartPointer<vtkAxesActor> axes =            vtkSmartPointer<vtkAxesActor>::New();        axes->SetTotalLength(50.0, 50.0, 50.0);        /**********************************End of volume renderer*********************************/
        /****************************************************************        create contour renderer to contouring stacked tomograms        ****************************************************************/        // Create an isosurface        vtkSmartPointer<vtkContourFilter> contourFilter =            vtkSmartPointer<vtkContourFilter>::New();        contourFilter->SetInputData(imageData);		        const double isovalue = 0.6;        contourFilter->GenerateValues(1, isovalue, isovalue); // (numContours, rangeStart, rangeEnd)        // Map the contours to graphical primitives        vtkSmartPointer<vtkPolyDataMapper> contourMapper =            vtkSmartPointer<vtkPolyDataMapper>::New();        contourMapper->SetInputData(contourFilter->GetOutput());
        // Create an actor for the contours        vtkSmartPointer<vtkActor> contourActor =            vtkSmartPointer<vtkActor>::New();        contourActor->SetMapper(contourMapper);
        // Create the outline        vtkSmartPointer<vtkOutlineFilter> outlineFilter =            vtkSmartPointer<vtkOutlineFilter>::New();        outlineFilter->SetInputData(imageData);		        vtkSmartPointer<vtkPolyDataMapper> outlineMapper =            vtkSmartPointer<vtkPolyDataMapper>::New();        outlineMapper->SetInputData(outlineFilter->GetOutput());        vtkSmartPointer<vtkActor> outlineActor =            vtkSmartPointer<vtkActor>::New();        outlineActor->SetMapper(outlineMapper);
        // Visualize        vtkSmartPointer<vtkRenderer> contourRenderer =            vtkSmartPointer<vtkRenderer>::New();        renWin->AddRenderer(contourRenderer);        contourRenderer->SetViewPoint(centerViewport);        contourRenderer->SetBackground(0.5, .4, .6);        /**********************************End of contour renderer*********************************/
        volumeRenderer->AddActor(volume);        volumeRenderer->AddActor(axes);
        contourRenderer->AddActor(contourActor);        contourRenderer->AddActor(outlineActor);
        contourRenderer->SetActiveCamera(volumeRenderer->GetActiveCamera());        volumeRenderer->ResetCamera();        contourRenderer->ResetCamera();
        // Render composite. In default mode. For coverage.        renWin->Render();        iren->Start(); 		 	   		  
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