Robert Osfield wrote: > Hi Tim, > > Thanks for spotting and reporting this issue. You reading is correct, > the flush of the osgDB::Registry's object cache won't called till at > least one PagedLOD is expired. > > What really should be happening is that the DatabasePager shouldn't be > responsible for flushing the object cache, it should be down to the > viewer. It should should do this alongside the present call the > DatabasePager::updateSceneGraph(). In svn/trunk I'm just modifying > DatabasePager/osgViewer to do this more appropriate. > > Do you see this as a critical enough issue to require patching the 2.8 > branch? A fix wouldn't be able to be as clean the changes I'm just > making to svn/trunk, but something like moving the object cache flush > to the top of the DatabasePager::capped_removeExpiredSubgraphs() would > probably suffice. It's not critical as far as we're concerned.
Tim > > Robert. > > > > On Tue, Jul 28, 2009 at 2:41 PM, Tim Moore<[email protected]> wrote: >> Hi, >> I have questions about two things I noticed with the object cache >> in osgDB::Registry. First, in Registry::readImplementation, >> addEntryToObjectCache is called without a timestamp. This gives them >> a timestamp of 0.0, so it seems to me that objects can be booted from >> the cache one frame after they are loaded i.e., the next time that the >> pager's >> updateSceneGraph function is run. On the other hand, in >> DatabasePager::capped_removeExpiredSubgraphs, if there are no PagedLODs >> to remove the function returns immediately and doesn't update/flush >> the object cache. If there are few or no PagedLODs in the scene graph >> -- FlightGear's use case -- then the object cache will never be flushed. >> I'm not complaining because this is the behavior I want, but I wonder if >> this was really the intent. >> >> Thanks, >> Tim >> _______________________________________________ >> osg-users mailing list >> [email protected] >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
