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);
        //                }
      }
    }
  }