From Farshid Lashkari, "As discussed, I've added the ability to handle Drawable objects within the NodeVisitor class. Here is an overview of the changes:

- Added apply(Drawable) and apply(Geometry) to NodeVisitor

- Added accept(NodeVisitor) method to Drawable/Geometry

- Added traverse(NodeVisitor) to Geode which calls accept(NodeVisitor) on all Drawables

- Updated CullVisitor to use new apply(Drawable) to handle drawables. The apply(Billboard) method still manually handles the drawables since it is depends on the billboard settings. I needed to disable the traverse within billboard to prevent duplicate traversal of drawables.

- Update other osgUtil node visitors (GLObjectsVisitor, IncrementalCompileOperation, ..) to use new apply(Drawable) method.
"

src/osgUtil/Statistics.cpp

@@ -251,11 +251,6 @@ void StatsVisitor::apply(osg::Geode& node)
     ++_numInstancedGeode;
     _geodeSet.insert(&node);
 
-    for(unsigned int i=0; i<node.getNumDrawables();++i)
-    {
-        apply(*node.getDrawable(i));
-    }
-
     traverse(node);
 }