/** Init. a new random world. */
  public void initWorld(String title, String seed) {
    final FastRandom random = new FastRandom();

    // Get rid of the old world
    if (_worldRenderer != null) {
      _worldRenderer.dispose();
      _worldRenderer = null;
    }

    if (seed == null) {
      seed = random.randomCharacterString(16);
    } else if (seed.isEmpty()) {
      seed = random.randomCharacterString(16);
    }

    Terasology.getInstance()
        .getLogger()
        .log(Level.INFO, "Creating new World with seed \"{0}\"", seed);

    // Init. a new world
    _worldRenderer = new WorldRenderer(title, seed, _entityManager, _localPlayerSys);

    File entityDataFile =
        new File(Terasology.getInstance().getWorldSavePath(title), ENTITY_DATA_FILE);
    _entityManager.clear();
    if (entityDataFile.exists()) {
      try {
        _entityManager.load(entityDataFile, EntityManager.SaveFormat.Binary);
      } catch (IOException e) {
        _logger.log(Level.SEVERE, "Failed to load entity data", e);
      }
    }

    LocalPlayer localPlayer = null;
    Iterator<EntityRef> iterator =
        _entityManager.iteratorEntities(LocalPlayerComponent.class).iterator();
    if (iterator.hasNext()) {
      localPlayer = new LocalPlayer(iterator.next());
    } else {
      PlayerFactory playerFactory = new PlayerFactory(_entityManager);
      localPlayer =
          new LocalPlayer(
              playerFactory.newInstance(
                  new Vector3f(_worldRenderer.getWorldProvider().nextSpawningPoint())));
    }
    _worldRenderer.setPlayer(localPlayer);

    // Create the first Portal if it doesn't exist yet
    _worldRenderer.initPortal();

    fastForwardWorld();
    CoreRegistry.put(WorldRenderer.class, _worldRenderer);
    CoreRegistry.put(IWorldProvider.class, _worldRenderer.getWorldProvider());
    CoreRegistry.put(LocalPlayer.class, _worldRenderer.getPlayer());
    CoreRegistry.put(Camera.class, _worldRenderer.getActiveCamera());
    CoreRegistry.put(BulletPhysicsRenderer.class, _worldRenderer.getBulletRenderer());

    for (ComponentSystem system : _componentSystemManager.iterateAll()) {
      system.initialise();
    }
  }
  public void init() {
    _hud = new UIHeadsUpDisplay();
    _hud.setVisible(true);

    _pauseMenu = new UIPauseMenu();
    _loadingScreen = new UILoadingScreen();
    _statusScreen = new UIStatusScreen();
    _inventoryScreen = new UIInventoryScreen();
    _metrics = new UIMetrics();

    _metrics.setVisible(true);

    _guiScreens.add(_metrics);
    _guiScreens.add(_hud);
    _guiScreens.add(_pauseMenu);
    _guiScreens.add(_loadingScreen);
    _guiScreens.add(_inventoryScreen);
    _guiScreens.add(_statusScreen);

    PojoEntityManager entityManager = new PojoEntityManager();

    entityManager.registerTypeHandler(BlockFamily.class, new BlockFamilyTypeHandler());
    entityManager.registerTypeHandler(Color4f.class, new Color4fTypeHandler());
    entityManager.registerTypeHandler(Quat4f.class, new Quat4fTypeHandler());
    entityManager.registerTypeHandler(
        Sound.class, new SoundTypeHandler(AudioManager.getInstance()));
    entityManager.registerTypeHandler(Vector3f.class, new Vector3fTypeHandler());
    entityManager.registerTypeHandler(Vector2f.class, new Vector2fTypeHandler());
    entityManager.registerTypeHandler(Vector3i.class, new Vector3iTypeHandler());

    // TODO: Use reflection pending mod support
    entityManager.registerComponentClass(ExplosionActionComponent.class);
    entityManager.registerComponentClass(PlaySoundActionComponent.class);
    entityManager.registerComponentClass(TunnelActionComponent.class);
    entityManager.registerComponentClass(AABBCollisionComponent.class);
    entityManager.registerComponentClass(BlockComponent.class);
    entityManager.registerComponentClass(BlockItemComponent.class);
    entityManager.registerComponentClass(BlockParticleEffectComponent.class);
    entityManager.registerComponentClass(CameraComponent.class);
    entityManager.registerComponentClass(CharacterMovementComponent.class);
    entityManager.registerComponentClass(CharacterSoundComponent.class);
    entityManager.registerComponentClass(HealthComponent.class);
    entityManager.registerComponentClass(InventoryComponent.class);
    entityManager.registerComponentClass(ItemComponent.class);
    entityManager.registerComponentClass(LightComponent.class);
    entityManager.registerComponentClass(LocalPlayerComponent.class);
    entityManager.registerComponentClass(LocationComponent.class);
    entityManager.registerComponentClass(MeshComponent.class);
    entityManager.registerComponentClass(PlayerComponent.class);
    entityManager.registerComponentClass(SimpleAIComponent.class);
    entityManager.registerComponentClass(AccessInventoryActionComponent.class);
    _entityManager = entityManager;

    _entityManager.setEventSystem(new PojoEventSystem(_entityManager));
    CoreRegistry.put(EntityManager.class, _entityManager);
    _componentSystemManager = new ComponentSystemManager();
    CoreRegistry.put(ComponentSystemManager.class, _componentSystemManager);

    PrefabManager prefabManager = new PojoPrefabManager();
    CoreRegistry.put(PrefabManager.class, prefabManager);
    entityManager.setPrefabManager(prefabManager);

    loadPrefabs();

    _componentSystemManager.register(new BlockEntityRegistry());
    _componentSystemManager.register(new CharacterMovementSystem());
    _componentSystemManager.register(new SimpleAISystem());
    _componentSystemManager.register(new ItemSystem());
    _componentSystemManager.register(new CharacterSoundSystem());
    _localPlayerSys = new LocalPlayerSystem();
    _componentSystemManager.register(_localPlayerSys);
    _componentSystemManager.register(new FirstPersonRenderer());
    _componentSystemManager.register(new HealthSystem());
    _componentSystemManager.register(new BlockEntitySystem());
    _componentSystemManager.register(new BlockParticleEmitterSystem());
    _componentSystemManager.register(new BlockDamageRenderer());
    _componentSystemManager.register(new InventorySystem());
    _componentSystemManager.register(new MeshRenderer());
    _componentSystemManager.register(new ExplosionAction());
    _componentSystemManager.register(new PlaySoundAction());
    _componentSystemManager.register(new TunnelAction());
    _componentSystemManager.register(new AccessInventoryAction());
  }