diff --git a/include/osg/Drawable b/include/osg/Drawable
index 9f14686af..530e516d2 100644
--- a/include/osg/Drawable
+++ b/include/osg/Drawable
@@ -145,18 +145,20 @@ class OSG_EXPORT Drawable : public Node
             if(!_boundingSphereComputed)
             {
                 _boundingBox = _initialBound;
+                
                 if (_computeBoundCallback.valid())
                     _boundingBox.expandBy(_computeBoundCallback->computeBound(*this));
                 else
                     _boundingBox.expandBy(computeBoundingBox());
 
+                if(_boundingBox.valid()){
+                    _boundingSphere.set(_boundingBox.center(), _boundingBox.radius());
+                } else {
+                    _boundingSphere.init();
+                }
+
                 _boundingSphereComputed = true;
             }
-            if(_boundingBox.valid()){
-                _boundingSphere.set(_boundingBox.center(), _boundingBox.radius());
-            } else {
-                _boundingSphere.init();
-            }
 
             return _boundingBox;
         }
diff --git a/include/osgUtil/UpdateVisitor b/include/osgUtil/UpdateVisitor
index de26cb1f4..799df2524 100644
--- a/include/osgUtil/UpdateVisitor
+++ b/include/osgUtil/UpdateVisitor
@@ -46,7 +46,18 @@ class OSGUTIL_EXPORT UpdateVisitor : public osg::NodeVisitor
         virtual void reset();
 
         /** During traversal each type of node calls its callbacks and its children traversed. */
-        virtual void apply(osg::Node& node)         { handle_callbacks_and_traverse(node); }
+        virtual void apply(osg::Node& node) { handle_callbacks_and_traverse(node); }
+
+        virtual void apply(osg::Drawable& drawable)
+        {
+            osg::Drawable::UpdateCallback* callback = drawable.getUpdateCallback();
+            if (callback) callback->update(this,&drawable);
+
+            osg::NodeCallback* node_callback = drawable.osg::Node::getUpdateCallback();
+            if (node_callback) (*node_callback)(&drawable, this);
+
+            handle_callbacks(drawable.getStateSet());
+        }
 
         virtual void apply(osg::Geode& node)        { handle_geode_callbacks(node); }
         virtual void apply(osg::Billboard& node)    { handle_geode_callbacks(node); }