if (nodeClass.isEnabled()) {
nodeClass.beforeDisplay(gl, glu);
for (Iterator<NodeModel> itr = octree.getNodeIterator(); itr.hasNext();) {
NodeModel obj = itr.next();
if (obj.markTime != markTime) {
obj.display(gl, glu, vizModel);
obj.markTime = markTime;
}
}
nodeClass.afterDisplay(gl, glu);
}