Virtual Reality Legacy support

public class Main extends SimpleApplication {

    public static void main(String[] args) {
        AppSettings settings = new AppSettings(true);
        settings.put(VRConstants.SETTING_VRAPI, VRConstants.SETTING_VRAPI_OPENVR_LWJGL_VALUE);
        settings.put(VRConstants.SETTING_ENABLE_MIRROR_WINDOW, true);

        VREnvironment env = new VREnvironment(settings);
        env.initialize();

    	// Checking if the VR environment is well initialized
    	// (access to the underlying VR system is effective, VR devices are detected).
    	if (env.isInitialized()){
            VRAppState vrAppState = new VRAppState(settings, env);
            vrAppState.setMirrorWindowSize(1024, 800);
            Main app = new Main(vrAppState);
            app.setLostFocusBehavior(LostFocusBehavior.Disabled);
            app.setSettings(settings);
            app.setShowSettings(false);
            app.start();
        }
    }

    public Main(AppState... appStates) {
        super(appStates);
    }

    @Override
    public void simpleInitApp() {
        Box b = new Box(1, 1, 1);
        Geometry geom = new Geometry("Box", b);

        Material mat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
        mat.setColor("Color", ColorRGBA.Blue);
        geom.setMaterial(mat);

        rootNode.attachChild(geom);
    }

    @Override
    public void simpleUpdate(float tpf) {
        //TODO: add update code
    }

    @Override
    public void simpleRender(RenderManager rm) {
        //TODO: add render code
    }
}