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

[Sebastian Messerschmidt]

Hi Mike,

you can add an
  osgDB::Registry::ReadFileCallback
and implement the readImage member function.
For registering it to the registry use:
osgDB::Registry::instance()->setReadFileCallback(myCloneReadFileCallback);

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

Cheers
Sebastian

> 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
>
>
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