Thanks Robert, you are right - the duplicate texture cannot be the problem.
I will check the database structure. I guess that the water tiles are not paged. Dieter -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Robert Osfield Sent: Wednesday, 09 June, 2010 09:46 To: OpenSceneGraph Users Subject: Re: [osg-users] DatabasePager performance problem Hi Dieter, On Tue, Jun 8, 2010 at 4:52 PM, PFEFFER Dieter > In my terrain database I use satellite images and a generic water texture. > In the highest LOD I can see many tiles which have all the same water > texture (512x512); I suppose this texture, although it is identically for > all water tiles, is loaded for every visible tile into the memory and the > performance drops from 60 fps to 0.5 fps. > > Is it possible to force the databasePager to load the water texture only > once ? There isn't a scheme in the DatabasePager for removing duplicate state, but there is the osgDB::SharedStateManager that you could experiment with as this is it's role. I'm afraid I'm not the author or have actively used the later so I can't provide specific guidance on this. As for the idea that tiles with duplicate texture will cause performance drop from 60fps to 0.5 fps, this does sound rather far fetched. VPB generates tiles that all have unique textures, regardless of the contents and the OSG on a modern machine can happily chug along at 60fps all day long. If you have seeing a drop of performance then it's unlikely to be the repeated sea textures at fault, and I'd strongly suggest you look into why as it rather does sound like your database is poorly conditioned for real-time use. Robert. _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org Unclassified Mail ------------------------------------------------------------------------------------------------------------ Disclaimer: If you are not the intended recipient of this email, please notify the sender and delete it. Any unauthorized copying, disclosure or distribution of this email or its attachment(s) is forbidden. Thales Nederland BV will not accept liability for any damage caused by this email or its attachment(s). Thales Nederland BV is seated in Hengelo and is registered at the Chamber of Commerce under number 06061578. ------------------------------------------------------------------------------------------------------------ _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
