[osg-users] How to set up the PageLOD?
Hi everybody, I've got a problem - FPS falls down from 100 to 2-3 for 1-2 seconds during first load of more detailed level of PageLODs (when they're first seen). We suppose it's because of object compilation (there are messages about textures loading etc. on the console). FPS also falls down when we look at newly loaded objects. Is it possible to compile objects prior to their rendering? How to set up the PageLOD? Or maybe there are other ways to solve that? -- Maxim Gammer ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] How to set up the PageLOD?
Hi Maxim First try : view-getDatabasePager()-setSchedulePriority(OpenThreads::Thread::THREAD_PRIORITY_LOW); Set the priority you prefer. Maybe this can help. Regard, Vincent. Maxim Gammer a écrit : Hi everybody, I've got a problem - FPS falls down from 100 to 2-3 for 1-2 seconds during first load of more detailed level of PageLODs (when they're first seen). We suppose it's because of object compilation (there are messages about textures loading etc. on the console). FPS also falls down when we look at newly loaded objects. Is it possible to compile objects prior to their rendering? How to set up the PageLOD? Or maybe there are other ways to solve that? -- Maxim Gammer ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org __ Information from ESET NOD32 Antivirus, version of virus signature database 4709 (20091222) __ The message was checked by ESET NOD32 Antivirus. http://www.eset.com ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] How to set up the PageLOD?
Hi Maxim, It sounds like the compilation of OpenGL objects is causing the frame drop. The new default for the DatabasePager is for the incremental pre compilation to be turned off, and for databases that are well balanced this doesn't cause problems with frame drops as the number of new objects per frame is kept modest so one doesn't get close to breaking frame when the new objects come in. For databases where there are lots of OpenGL objects that are introduced at once you can switch back on the incremental pre compile, the tells the DatabasePager to record all the OpenGL objects that need compiling and then on each frame compile as many as it can within specified time and number limits. The incremental compile reduces the overhead per frame so reduces the chances of breaking frame, however, it also increases the amount of time it takes to prepare a scene graph before it can be merged with the main databases - so there is higher latency between requesting a tile and when it's served up. To switch on the pre compile use: viewer.getDatabasePager()-setDoPreCompile(true); There is a whole suite of methods relating to the fine control of pre compile in the DatabasePager so have a look over the headers. The other thing you could do is improve the suitability of your databases so that it's better balanced - for instance switching between LOD levels shouldn't introduce so much geometry/textures at one time. Try to create a quad tree paged database where each tile is divided in four, and each child contains roughly the same amount of geometry and textures as it's parent. Such a well balanced database won't suddenly introduce lots of geometry and textures in one go. Robert. On Tue, Dec 22, 2009 at 4:20 PM, Maxim Gammer maxgam...@gmail.com wrote: Hi everybody, I've got a problem - FPS falls down from 100 to 2-3 for 1-2 seconds during first load of more detailed level of PageLODs (when they're first seen). We suppose it's because of object compilation (there are messages about textures loading etc. on the console). FPS also falls down when we look at newly loaded objects. Is it possible to compile objects prior to their rendering? How to set up the PageLOD? Or maybe there are other ways to solve that? -- Maxim Gammer ___ 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
Re: [osg-users] How to set up the PageLOD?
Thanks! 2009/12/22 Robert Osfield robert.osfi...@gmail.com Hi Maxim, It sounds like the compilation of OpenGL objects is causing the frame drop. The new default for the DatabasePager is for the incremental pre compilation to be turned off, and for databases that are well balanced this doesn't cause problems with frame drops as the number of new objects per frame is kept modest so one doesn't get close to breaking frame when the new objects come in. For databases where there are lots of OpenGL objects that are introduced at once you can switch back on the incremental pre compile, the tells the DatabasePager to record all the OpenGL objects that need compiling and then on each frame compile as many as it can within specified time and number limits. The incremental compile reduces the overhead per frame so reduces the chances of breaking frame, however, it also increases the amount of time it takes to prepare a scene graph before it can be merged with the main databases - so there is higher latency between requesting a tile and when it's served up. To switch on the pre compile use: viewer.getDatabasePager()-setDoPreCompile(true); There is a whole suite of methods relating to the fine control of pre compile in the DatabasePager so have a look over the headers. The other thing you could do is improve the suitability of your databases so that it's better balanced - for instance switching between LOD levels shouldn't introduce so much geometry/textures at one time. Try to create a quad tree paged database where each tile is divided in four, and each child contains roughly the same amount of geometry and textures as it's parent. Such a well balanced database won't suddenly introduce lots of geometry and textures in one go. Robert. On Tue, Dec 22, 2009 at 4:20 PM, Maxim Gammer maxgam...@gmail.com wrote: Hi everybody, I've got a problem - FPS falls down from 100 to 2-3 for 1-2 seconds during first load of more detailed level of PageLODs (when they're first seen). We suppose it's because of object compilation (there are messages about textures loading etc. on the console). FPS also falls down when we look at newly loaded objects. Is it possible to compile objects prior to their rendering? How to set up the PageLOD? Or maybe there are other ways to solve that? -- Maxim Gammer ___ 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 -- Maxim Gammer ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
