Hi Patrick, thanks a lot. Meanwhile I already found out about the speed decrease due to the non power of two osg::Image I used. Turning of Mipmap generation increased speed even more.
bye, thomas Patrick Dähne schrieb: > Hello Thomas, > > Am 16.11.2006 um 18:30 schrieb Thomas Kulessa: > > >>I am experimenting with video textures on OpenSG 1.6. I use the ffmpeg >>library for video decoding and a modified version of >>23videotexturebackground.cpp for testing. As long as I stick to the >>tutorial and map the texture on the background all is fine: video >>display is very fast, much more than 25fps. But if I put >>the video texture on e.g. a simple plane in an otherwise empty scene, >>video update gets very slow. CPU usage is only about 50% on my >>machine. >>I coded it in plain OpenGL with the same interface to ffmpeg and it >>works well. >>Does anybody has an idea why this happens? > > > Yes. > > 1. Switch off mipmap generation, i.e. set the "minFilter" field of > the TextureChunk to "GL_NEAREST" or "GL_LINEAR". > > 2. Switch off autoscaling, i.e. set the "scale" field of the > TextureChunk to "false". The problem here is that the results differ > depending on what kind of graphics hardware OpenSG is running on. > When your graphics board supports the > "GL_ARB_texture_non_power_of_two" extension, everything is ok. When > not, you have to manually adjust your texture coordinates (or use a > TextureTransformChunk). > > Bye, > > Patrick > > > > > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share your > opinions on IT & business topics through brief surveys - and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > _______________________________________________ > Opensg-users mailing list > Opensg-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/opensg-users ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Opensg-users mailing list Opensg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/opensg-users
