IM=Immediate mode rendering
2008/5/7 Robert Osfield <[EMAIL PROTECTED]>: > Hi Fabio, > > On Tue, May 6, 2008 at 3:32 PM, fabio riot <[EMAIL PROTECTED]> wrote: > > About your advice...(how to render 12000000 triangles file,ply) > > Once I break the model into smaller geometry (for example N=200 > > geometry blocks with 60000 triangles), > > have I to create a scene with one geode for each geometry? or only one > > geode containing all N geometry? > > > > I thought the first solution was the best...but trying both I'haven't > > noticed difference in frame rate > > Your biggest bottleneck will be the GPU, which is down to granularity > and the way that you pass your data. The exact way you hang the > Geometries off the scene graph won't matter too much right now as you > aren't CPU limited, later on once you have the GPU side working > efficient you might see CPU overhead being an issue, then we can look > at optimizing the scene graph structure, but right now don't worry > about it. > > W.r.t Granularity try various tests with different number of > triangles in each geometry, look for the sweet spot. > > W.r.t how you pass the data, VBO's will most likely be the best way. > Also you need to reduce the amount of memory you using - use > compressed versions of colours, share vertices as much as possible - > use osg::DrawElementUShort. > > > > beside with smaller geometry I'have noticed an improvement in > > rendering performance using VBO or IM (about 5 fps (N=200) versus 1fps > > (N=1)), > > but the best solution seem to be DL (fps 15 in all case N=1 or N=220). > > > > For larger dataset (30.000.000 triangles) the program is able to view > > the object, only using IM (switching off DL and VBO) > > What do you mean by IM? > > _______________________________________________ > 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
