Hello Peter, that was the problem! Now I have around 1500 FPS. I didn't know there are difference between to attach an image or a texture.
Thank you very much! Cheers Martin -------- Original-Nachricht -------- > Datum: Wed, 02 Feb 2011 14:58:46 +0100 > Von: Peter Hrenka <[email protected]> > An: OpenSceneGraph Users <[email protected]> > Betreff: Re: [osg-users] Render To Texture is very slow > Hi Martin, > > Am 02.02.2011 14:35, schrieb "Martin Großer": > > Hello David, > > > > So I use the FRAME_BUFFER_OBJECT and I have a NVIDIA GTX 470 grafics > card. > > > > I tried the osgprerendercubemap, but I cannot print out the frame rate. > Additionally I tried the osgprerender example and I get a frame rate of > around 3500 FPS. > > > > Here my Implementation: > > > > osg::ref_ptr<osg::Image> img = osgDB::readImageFile("image.tga"); > > > > osg::ref_ptr<osg::Group> rtt = new osg::Group; > > root->addChild(rtt); > > > > > > osg::ref_ptr<osg::Camera> camera = new osg::Camera; > > > > camera->addChild( scene ); > > > > camera->setClearMask( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); > > > > camera->setViewport(0,0,2048,2048); > > > > camera->setRenderOrder(osg::Camera::PRE_RENDER, 0); > > > > camera->setRenderTargetImplementation( osg::Camera::FRAME_BUFFER_OBJECT > ); > > camera->attach(osg::Camera::COLOR_BUFFER, img, 0, 0); > > Your performance Problem is in the previous line: > By attaching an image you instruct OSG to fetch > the whole image back to CPU memory (for each frame!). > > If this is what you really want, it probably is as fast > as it will get. > > If you want to use the rendered image on the GPU, > then you should attach an osg::Texture instead. > > See osgprerender example, with "useImage=false". > > > > rtt->addChild(camera.get()); > > > > Is the image format (internal format) a problem? > > > > Thanks > > > > Martin > > Cheers, > > Peter > -- > Vorstand/Board of Management: > Dr. Bernd Finkbeiner, Dr. Roland Niemeier, > Dr. Arno Steitz, Dr. Ingrid Zech > Vorsitzender des Aufsichtsrats/ > Chairman of the Supervisory Board: > Michel Lepert > Sitz/Registered Office: Tuebingen > Registergericht/Registration Court: Stuttgart > Registernummer/Commercial Register No.: HRB 382196 > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- GMX DSL Doppel-Flat ab 19,99 Euro/mtl.! Jetzt mit gratis Handy-Flat! http://portal.gmx.net/de/go/dsl _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
