private void updateNodes(HierarchicalGraph graph) {
    Modeler nodeInit = engine.getModelClasses()[AbstractEngine.CLASS_NODE].getCurrentModeler();

    NodeIterable nodeIterable;
    nodeIterable = graph.getNodes();

    for (Node node : nodeIterable) {

      Model obj = node.getNodeData().getModel();
      if (obj == null) {
        // Model is null, ADD
        obj = nodeInit.initModel(node.getNodeData());
        engine.addObject(AbstractEngine.CLASS_NODE, (ModelImpl) obj);
      } else if (!obj.isValid()) {
        engine.addObject(AbstractEngine.CLASS_NODE, (ModelImpl) obj);
      }
      obj.setCacheMarker(cacheMarker);

      // Modeaction
      if (modeManager.getMode().equals(ModeManager.AVAILABLE_MODES.HIGHLIGHT)) {
        ModelImpl impl = (ModelImpl) obj;
        //                if (!node.isVisible()) {
        //                    ColorLayer.layerColor(impl, 0.8f, 0.8f, 0.8f);
        //                }
      }
    }
  }
  public void updateWorld() {
    // System.out.println("update world");
    cacheMarker++;

    GraphModel graphModel = controller.getModel();
    if (graphModel == null) {
      engine.worldUpdated(cacheMarker);
      return;
    }
    if (gm != null && gm != graphModel) {
      reset();
    }
    gm = graphModel;
    HierarchicalGraph graph;
    if (graphModel.isDirected()) {
      undirected = false;
      graph = graphModel.getHierarchicalDirectedGraphVisible();
    } else if (graphModel.isUndirected()) {
      undirected = true;
      graph = graphModel.getHierarchicalUndirectedGraphVisible();
    } else if (graphModel.isMixed()) {
      undirected = false;
      graph = graphModel.getHierarchicalMixedGraphVisible();
    } else {
      undirected = false;
      graph = graphModel.getHierarchicalDirectedGraphVisible();
    }

    if (dynamicModel == null) {
      DynamicController dynamicController = Lookup.getDefault().lookup(DynamicController.class);
      dynamicModel = dynamicController.getModel();
    }

    graphView = graph.getView().getViewId();

    ModelClass[] object3dClasses = engine.getModelClasses();

    graph.readLock();

    ModelClass nodeClass = object3dClasses[AbstractEngine.CLASS_NODE];
    if (nodeClass.isEnabled()
        && (graph.getNodeVersion() > nodeVersion || modeManager.requireModeChange())) {
      updateNodes(graph);
      nodeClass.setCacheMarker(cacheMarker);
    }

    ModelClass edgeClass = object3dClasses[AbstractEngine.CLASS_EDGE];
    if (edgeClass.isEnabled()
        && (graph.getEdgeVersion() > edgeVersion || modeManager.requireModeChange())) {
      updateEdges(graph);
      updateMetaEdges(graph);
      edgeClass.setCacheMarker(cacheMarker);
      if (!undirected && vizConfig.isShowArrows()) {
        object3dClasses[AbstractEngine.CLASS_ARROW].setCacheMarker(cacheMarker);
      }
    }

    ModelClass potatoClass = object3dClasses[AbstractEngine.CLASS_POTATO];
    if (potatoClass.isEnabled()
        && (graph.getNodeVersion() > nodeVersion || modeManager.requireModeChange())) {
      updatePotatoes(graph);
      potatoClass.setCacheMarker(cacheMarker);
    }

    nodeVersion = graph.getNodeVersion();
    edgeVersion = graph.getEdgeVersion();

    graph.readUnlock();

    engine.worldUpdated(cacheMarker);
  }