# LightActor

VTKExamples/Cxx/Lighting/LightActor

### Code

LightActor.cxx

    #include <cstdlib>

    #include <vtkRenderer.h>
    #include <vtkRenderWindow.h>
    #include <vtkLightActor.h>
    #include <vtkLight.h>
    #include <vtkSmartPointer.h>
    #include <vtkRenderWindowInteractor.h>

    int main(int, char *[])
    {
      vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();

      // Display where the light is
      vtkSmartPointer<vtkLight> light = vtkSmartPointer<vtkLight>::New();
      light->SetPositional(true); // without this line, the program crashes
      vtkSmartPointer<vtkLightActor> lightActor = vtkSmartPointer<vtkLightActor>::New();
      lightActor->SetLight(light);
      renderer->AddViewProp(lightActor);

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

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

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

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(LightActor)

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

    add_executable(LightActor MACOSX_BUNDLE LightActor.cxx)

    target_link_libraries(LightActor ${VTK_LIBRARIES})

### Download and Build LightActor

Danger

The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.

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

    cd LightActor/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:

    ./LightActor

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.