[osg-users] DatabasePager - how to modify data during loading

Sebastian Messerschmidt sebastian.messerschmidt at gmx.de
Thu May 28 00:22:11 PDT 2015

Hi Mike,

you can add an
and implement the readImage member function.
For registering it to the registry use:

This will be triggered by the database-pager when loading the image.
It won't help you with the destination-problem however.


> Hi all!
> I am finishing up some work which involves modifying nodes as they are 
> loaded via the database pager - I want to edit the data after it is 
> loaded, but before it is added to the scenegraph. I also need to know 
> the destination (future parent) node in the scenegraph where the 
> edited node will be located.
> It looks to me like a suitable location for this work is pretty much 
> in the middle of DatabaseThread::run - after the node is loaded via 
> readNode (), but before it is added to the file cache. All the data I 
> need appears to be held in the DatabaseRequest object.
> Is there another (simpler?) way of inserting my code into the loading 
> process?
> If the middle of the run method is the best location, would a patch to 
> allow a optional callback function to be called be considered?
> best wishes
> Mike
> _______________________________________________
> osg-users mailing list
> osg-users at lists.openscenegraph.org
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org

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