Hi Valerian, The PagedLOD/DatabasePager pairing is primarily written to support paging of vis-sim databases, rather than just general loading of databases in background threads. These design/implementation is quite specialized as it has to support tight performance metrics such as avoiding frame drops, hitting a solid 60Hz, load balancing etc.
For general loading of databases you are probably best just implementing your own scheme. It needn't be complicated as much of the infrastructure required already exists in the OSG - You have osg::OperationQueue/OperationThread/Operation that can be used to run the threads with where adding the custom load can be done just by subclassing from osg::Operation and then adding it to the queue. This will then be called automatically from any OperationThread that you attach the queue to. All done in a thread safe way. Merging of loading databases I'd do as part of the update phases of the scene graph frame, but not as an update callback. You can use the Viewer::addUpdateOperation(Operation*) method to add in an custom operation that is called during the update phases of each new frame. In this custom Operation you'd take all the subgraphs loaded by the custom Database operations and then merge them in the appropriate place to the main scene graph. Have a look at the osgthreadedterrain example to see an example of this in action. Robert. On 12 September 2016 at 16:13, Valerian Merkling <niarkolep...@gmail.com> wrote: > Hi, > > Reading this thread > http://forum.openscenegraph.org/viewtopic.php?t=16128 scared me a little : > I'm using a UpdateCallback to add node into my scene graph. > > I've no problem with it for know but my goal was to make a clean migration > from openGL to OSG, so I would like to make it better. > > I'm looking at the DatabsaePager class to try to get what to do, but since > I'm working on a old app, all the threaded data loading is already done, I > just need to add those data to the scene graph, and I would like to know if > the DatabasePager can also help me in this case. > > And another quick question : database pager seems to work a lot with paged > LOD, and I'm using a lot of PagedLOD to hide/show if the camera is in a fixed > range (and absolutely no data loading). Is that bad ? Could it slow down > somethings ? > > Thank you! > > Cheers, > Valerian > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=68582#68582 > > > > > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org