public void create() {   
   testStage = new BaseStage(800, 480, true);      
   FileHandle backgroundPicture = Gdx.files.internal("assets/sampleBG.png");
   texture = new Texture(backgroundPicture);
   Image img = new Image("bg", texture);
   img.x = 0;
   img.y = 0;      
   testStage.addActor(img);      
}
@Override
public void render() {      
    GLCommon gl = Gdx.gl;
    gl.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
    gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
    
    testStage.act(Gdx.graphics.getDeltaTime());
    testStage.draw();
}

public class BaseStage extends Stage implements InputProcessor {
   
   RayHandler rayHandler;   
   World world;
   OrthographicCamera camera;
   
   public BaseStage(float width, float height, boolean stretch) {
      super(width, height, stretch);
      Gdx.input.setInputProcessor(this);
      
      camera = new OrthographicCamera(80, 48);
      world = new World(new Vector2(0, 0), true);
      rayHandler = new RayHandler(world);
      rayHandler.setCulling(true);
      rayHandler.setCombinedMatrix(camera.combined);      
      rayHandler.useDiffuseLight(true);
      rayHandler.setAmbientLight(0.2f, 0.2f, 0.2f,1.0f);
   }

   @Override
   public void draw () {
      super.draw();         
      
      rayHandler.updateAndRender();
   }
   
   @Override
   public void dispose() {
      rayHandler.dispose();
   }
   
   public Vector2 gdxCoordinateToBox2D(float x, float y) {
      float K = 10;
      return new Vector2(x/K-width/(2*K), height/(2*K)-y/K);
      
   }

   @Override
   public boolean touchUp(int x, int y, int pointer, int button) {
      Vector2 coordinate = gdxCoordinateToBox2D(x, y);
      Color clr3 = new Color(0.5f,0.8f,0.2f, 0.9f);
      Light pt = new PointLight(rayHandler, 5, clr3, 30, coordinate.x, coordinate.y); 
      pt.setStaticLight(true);
      
      return false;
   }
}