Hi Guy, This sounds rather odd. Going from bilinear to trilinear should not have a significant effect on performance, as it would suggest that the texture filtering is a bottleneck to a massive degree, something I wouldn't expect any card made in the last decade to show.
So what is going on? Well you can start by telling us what performance you are getting and what other settings you are using that may effect texture filtering performance. Robert. On Sat, Feb 13, 2010 at 12:04 AM, Guy Volckaert <[email protected]> wrote: > Hi, > > I was wondering was experiencing the same odd behavior I am. I created a > visitor that essentially iterates through all the textures of a terrain scene > graph to change their texture filtering from bilinear to trilinear. > > When I replace the filtering from bilinear to trilinear, I get a boost of 50% > in performance. If I completely bypass my texture visitor then I get a bad > performance. > > This is contrary to what I've been told. I was under the impression tha > bilinear filtering was essentially free (as far as performance goes), and > that trilinear was a little more expensive (but fairly negligeable). > > This is not was I am observing. I've tried this on several different graphic > cards (9500 GT, 8800 GTX, 260, etc). The driver version I am using is v195.x > but it also happens on 185.x. > > Can someone explain this to me? Someone told me that the new GPUs are built > with trilinear in mind, and therefore would perform better is trilinear. Is > this true? > > Regards, > > > > > > > > > Cheers, > Guy > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=24104#24104 > > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
