VizModel vizModel = VizController.getInstance().getVizModel();
//Potato
if (potatoClass.isEnabled()) {
potatoClass.beforeDisplay(gl, glu);
for (Iterator<ModelImpl> itr = octree.getObjectIterator(AbstractEngine.CLASS_POTATO); itr.hasNext();) {
ModelImpl obj = itr.next();
if (obj.markTime != markTime) {
obj.display(gl, glu, vizModel);