Hi,
Tell me I'm dumb but I'm kind of surprise that ones can't add several Camera 
postdraw callbacks.
Is there a reason for it? 

Ex:I'm using osg::OcclusionQueryNodes in my scene, so when I set the 
PostDrawCallBack of the Camera during CullTraversal it replaces the one setted 
up by   osg::OcclusionQueryNode cull traversal

Thank you!

Cheers,
Julien

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http://forum.openscenegraph.org/viewtopic.php?p=62179#62179





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