[osg-submissions] Query ID deletion for OcclusionQueryNode

[Paul Martz]

Hi Robert -- This pretty much wraps up the OcclusionQueryNode work. I might
make some additional modifications if testing reveals any issues, otherwise
it's ready for 2.4.
 
Paul Martz
Skew Matrix Software LLC
http://www.skew-matrix.com <http://www.skew-matrix.com/> 
303 859 9466
 
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