[osg-submissions] Intersection Visitor and PagedLOD behavior

[Serge Lages]

Hi Robert,

Here is a modification on IntersectionVisitor to control its behavior when
traversing a PagedLOD. It allows to specify if it needs to traverse all the
node or only the highest resolution child.

If you find it too intrusive, we can find another way to do it. For example
we can modify the ReadCallback to also take the node object in parameter,
this way with a custom callback we would be able to easily return which node
we want to traverse.

Cheers,

-- 
Serge Lages
http://www.magrathea-engine.org
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