Chaned the OsgCameraGroup so that its scene handler list used ref_ptr<> for

robustly managing memory.

examples/osglight/osglight.cpp

@@ -355,10 +355,9 @@ int main( int argc, char **argv )
         itr!=viewer.getSceneHandlerList().end();
         ++itr)
     {
-        osgUtil::SceneView* sceneview = *itr;
         // switch off small feature culling to prevent the light points from being culled.
+        osgUtil::SceneView* sceneview = itr->get();
         sceneview->setCullingMode( sceneview->getCullingMode() & ~osg::CullStack::SMALL_FEATURE_CULLING);
-        //sceneview->setCullingMode( 0);
     }
 
     while( !viewer.done() )

examples/osgoccluder/osgoccluder.cpp

@@ -347,7 +347,7 @@ int main( int argc, char **argv )
 
     if (manuallyCreateOccluders)
     {
-        osgUtil::SceneView* sceneview = viewer.getSceneHandlerList()[0];
+        osgUtil::SceneView* sceneview = viewer.getSceneHandlerList()[0].get();
     
         viewer.getEventHandlerList().push_front(new OccluderEventHandler(sceneview,rootnode));
     }

examples/osgstereoimage/osgstereoimage.cpp

@@ -108,7 +108,7 @@ int main( int argc, char **argv )
         itr!=viewer.getSceneHandlerList().end();
         ++itr)
     {
-        osgUtil::SceneView* sceneview = *itr;
+        osgUtil::SceneView* sceneview = itr->get();
         sceneview->setCullMask(0xffffffff);
         sceneview->setCullMaskLeft(0x00000001);
         sceneview->setCullMaskRight(0x00000002);

examples/osgviewer/osgviewer.cpp

@@ -86,6 +86,9 @@ int main( int argc, char **argv )
         
     }
     
+    // wait for all cull and draw threads to complete before exit.
+    viewer.sync();
+
     return 0;
 }