Hi Jason, Normally the DatabasePager works on loaded scene graph that are entirely independent from the main scene graph and these subgraphs are only merged with the main scene graph when the main frame loop calls the update on the DatabasePager to merge any new tiles, remove expired ones. The update is down thread safe, with locking happening for all the appropriate places. If the place that the node is being attached is already unref'd from the scene graph then the subgraph should just be safely discarded.
In the case of osgEarth do you have a pointers to global/parental structures in the plugins that would break the normal scene graph encapsulation that the database normally has? If there is such a reference then it might be best to take a reference to this global/parent strucutre during the running of the plugin to prevent it going out of scope before the end of the call to the plugin. Robert. 2009/3/23 Jason Beverage <[email protected]> > Hi Robert, > > I've been working with loading and unloading different osgEarth files at > runtime (such as from a File | Open menu) using OSG and have found that I > need to take special care to make sure that the DatabasePager is not working > on a loaded node before removing it and replacing it with a different > scene. This isn't a big deal and essentially consists of telling the > database pager to not accept any new requests, clearing any pending requests > and waiting for the pager to complete by checking the getRequestsInProgress. > > I've found that if I simply replace the main earth file's node with a new > one while the DatabasePager is working, my application will crash. Is this > the intended behavior or have I found a potential issue? > > Thanks! > > Jason > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > >
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