[osg-submissions] OverlayNode texture update problem

[J.P. Delport]

Hi,

I have been using the new VIEW_DEPENDENT_WITH_ORTHOGRAPHIC_OVERLAY mode 
of the OverlayNode.

I change the overlay subgraph dynamically and when I remove all the 
subgraph nodes that is inside the current main camera FOV (others 
outside still exist), the overlay texture does not update because of the 
early return in the traversal. I then get a kind of ghost texture moving 
around the terrain.

The attached file fixed the problem for me, but I'm not sure if it is 
the best way to address the problem.

regards
jp

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