Hi Martin, Be aware that for some combinaison of driver/hardware, VBO just don't work properly. I've encoutered the case on some Intel/ATI chipsets. A simple terrain created with VPB couldn't be loaded. With VBO OFF, everything was OK.
Be also aware that if you use small geometries, there is a high overhead with VBO at initialization. It could be a good idea to make VBO you default implementation, but don't forget to have fallbacks when things will go wrong (especially if you have no control over target hardware) http://lists.openscenegraph.org/pipermail/osg-users-openscenegraph.org/2011-July/052968.html http://lists.openscenegraph.org/pipermail/osg-users-openscenegraph.org/2008-August/015543.html Luc De : "Martin Großer" <grosser.mar...@gmx.de> A : OpenSceneGraph Users <osg-users@lists.openscenegraph.org> Date: 28/02/2012 13:01 Objet : Re: [osg-users] Slow rendering with displaylist. Envoyé par : osg-users-boun...@lists.openscenegraph.org Hello, thanks to you, it was very helpful. Now I will only use VBOs. Greetings, Martin -------- Original-Nachricht -------- > Datum: Tue, 28 Feb 2012 12:44:15 +0100 > Von: Daniel Trstenjak <daniel.trsten...@science-computing.de> > An: OpenSceneGraph Users <osg-users@lists.openscenegraph.org> > Betreff: Re: [osg-users] Slow rendering with displaylist. > > Hi Martin, > > > That is basically true. I want to get a feeling about DisplayLists and > > VBOs. I know that the display list is a precompiled sequence of OpenGL > > commands. That is the reason that I tought the display lists should be > > faster. But the question isn't the comparison, but the slow render > > performance when I want to use display lists. I think everything is > > wrong in my implementation. But I don't know what. > > My point about system/graphics card memory is wrong. I thought > about glVertexPointer, but this call isn't even compiled into > a display list and shouldn't be used with one. > > So OSG will most likely use glBegin/glEnd to put the vertex data into > the display list. > > It boils down to what Mathias ;) said, it's an implementation issue, > dirty corner cases and driver developers don't optimize the > display lists anymore, because they're deprecated and just not used > that much anymore. > > > Greetings, > Daniel > > -- > > > Daniel Trstenjak Tel : +49 (0)7071-9457-264 > science + computing ag FAX : +49 (0)7071-9457-511 > Hagellocher Weg 73 mailto: daniel.trsten...@science-computing.de > D-72070 Tübingen WWW : http://www.science-computing.de/ > > -- > Vorstand/Board of Management: > Dr. Bernd Finkbeiner, Michael Heinrichs, > Dr. Roland Niemeier, Dr. Arno Steitz, Dr. Ingrid Zech > Vorsitzender des Aufsichtsrats/ > Chairman of the Supervisory Board: > Philippe Miltin > Sitz/Registered Office: Tuebingen > Registergericht/Registration Court: Stuttgart > Registernummer/Commercial Register No.: HRB 382196 > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- NEU: FreePhone 3-fach-Flat mit kostenlosem Smartphone! Jetzt informieren: http://mobile.1und1.de/?ac=OM.PW.PW003K20328T7073a _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
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