public void setupDome() {
        Geometry dome = new Geometry("Dome", new Sphere(16, 32, 30, false, true));
        dome.setMaterial(new Material(this.assetManager, "Common/MatDefs/Light/PBRLighting.j3md"));
        dome.setLocalTranslation(new Vector3f(0, 0, 0));
        rootNode.attachChild(dome);
    }
Similar to {@link TestLightControlDirectional}, except that the spatial is controlled by the light this
time.

@author Markil 3
jme3-examples/src/main/java/jme3test/light/TestLightControl2Directional.java