# LayeredRenderers

VTKExamples/Cxx/WishList/Visualization/LayeredRenderers

### Code

LayeredRenderers.cxx

    #include <vtkSphereSource.h>
    #include <vtkTransform.h>
    #include <vtkPolyData.h>
    #include <vtkSmartPointer.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkActor.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkVectorText.h>

    int main(int, char *[])
    {
      // Create a sphere
      vtkSmartPointer<vtkSphereSource> sphereSource =
        vtkSmartPointer<vtkSphereSource>::New();
      sphereSource->Update();

      vtkSmartPointer<vtkPolyDataMapper> sphereMapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      sphereMapper->SetInputConnection(sphereSource->GetOutputPort());

      vtkSmartPointer<vtkActor> sphereActor =
        vtkSmartPointer<vtkActor>::New();
      sphereActor->SetMapper(sphereMapper);

      // Create text
      vtkSmartPointer<vtkVectorText> textSource =
        vtkSmartPointer<vtkVectorText>::New();
      textSource->SetText("TEXT");
      textSource->Update();

      vtkSmartPointer<vtkPolyDataMapper> textMapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      textMapper->SetInputConnection(textSource->GetOutputPort());

      vtkSmartPointer<vtkActor> textActor =
        vtkSmartPointer<vtkActor>::New();
      textActor->SetMapper(textMapper);

      vtkSmartPointer<vtkRenderer> renderer1 =
        vtkSmartPointer<vtkRenderer>::New();
      renderer1->SetLayer(0);

      vtkSmartPointer<vtkRenderer> renderer2 =
        vtkSmartPointer<vtkRenderer>::New();
      renderer2->SetActiveCamera(renderer1->GetActiveCamera());
      renderer2->SetLayer(1);

      vtkSmartPointer<vtkRenderWindow> renderWindow =
        vtkSmartPointer<vtkRenderWindow>::New();
      renderWindow->AddRenderer(renderer1);
      renderWindow->AddRenderer(renderer2);

      vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
      renderWindowInteractor->SetRenderWindow(renderWindow);

      renderer1->AddActor(sphereActor);
      renderer2->AddActor(textActor);

      renderWindow->SetNumberOfLayers(2);
      renderer1->ResetCamera();
      renderWindow->Render();
      renderWindowInteractor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(LayeredRenderers)

    find_package(VTK REQUIRED)
    include(${VTK_USE_FILE})

    add_executable(LayeredRenderers MACOSX_BUNDLE LayeredRenderers.cxx)

    target_link_libraries(LayeredRenderers ${VTK_LIBRARIES})

### Download and Build LayeredRenderers

Click here to download LayeredRenderers and its CMakeLists.txt file. Once the tarball LayeredRenderers.tar has been downloaded and extracted,

    cd LayeredRenderers/build

If VTK is installed:

    cmake ..

If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

    cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

Build the project:

    make

and run it:

    ./LayeredRenderers

WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.