Hi Ale If I read you correctly,you're said to be gpu bound because of the huge amount of vertices to process. You're also saying you're working with CAD representation (which AFAIK have parametric representation(shape) ) I think the good approach is to keep your geometry parametric (shape) and update geometry parameter (and so on explicit geometry) based on viewer distance...
Hope it helps in some way:/ Cheers Ale wrote: > Hi, > > I posted some question about OSG performance in the past and now I would like > to definitively improve visualization performance of my application. > I want to say that now I already have very good performances with OSG but now > I need to start thinking how to manage also some "extreme" scenes. > > It is a CAD-like application and a possible scene is composed by some objects > (let's say from 1 to some hundreds) each one with 100K to some millions of > triangles. > Each of these objects can have up to some thousands of children each one with > around 100 triangles. > For all objects I use vertexbuffer instead of display lists to reduce waiting > time at first draw (due to display list compilation). > I use a matrixtransform for each object and few groups for all the scene. > Normally objects are not modified but sometimes they can be modified on the > fly by user. So I did not set DataVariance (I supposed it is set > automatically to STATIC if I did not modify an object). > The application is GPU bounded as I can see from on-screen stats. > > I cannot merge objects or groups into one becouse I need to do some > operations on them so I need to keep them separated. > I am using KdTrees to improve object picking, it now works well but the > interaction is still not smooth becouse of the slow frame rate. > I think I cannot use LODs becouse triangle reduction on-the-fly can take very > long time on this type of scenes. > I tried with osgViewer and more or less it have the same performance of my > application. > At the moment I can just show bounding boxes for raw scene manipulation but > often I need to show object details. > > Could you give me some hint to improve performances? I hope information I > give you are enough to do a first analysis. > At the moment I am not able to setup such a scene to send you screenshots of > the stats but I can do it in next days if needed. > > Thank you in advance. > > Best regards, > Ale ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=70295#70295 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
