ConvexHull hull = (ConvexHull) hullModel.getObj();
hull.addNode(n);
hull.setModel(hullModel);
} else if (hullModel != null) {
//Its not the first time the hull exist
ConvexHullModel model = (ConvexHullModel) hullModel;
model.setScale(1f);
hullModel.setCacheMarker(cacheMarker);
hulls.add((ModelImpl) hullModel);
} else {
ConvexHull ch = new ConvexHull();
ch.setMetaNode(parent);