Never used it, so I'm not sure if it would help or not, personally I prefer to build my scenegraph such that I control how its put together, but that's me ;)
but the billboard node may ? Stop this work, maybe not ... He could certainly try and see if he gets back etc.. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Paul Melis Sent: Friday, May 23, 2008 12:26 PM To: OpenSceneGraph Users Subject: Re: [osg-users] Small object frustum culling Gordon Tomlinson wrote: >Robert is saying you should create your scene graph such that it >replicates a quad tree and separate the billboards in to geo-spatially >partitioned groups > > Wouldn't the SPATIALISE_GROUPS option of the Optimizer class do this automatically for him? Paul > >See http://www.vis-sim.com/imgdp/dbpart1.jpg, your tree is like the >last one 'Root B' which is a very bad tree for a scene graph > >The middle diagram shows a slightly better partioned tree ( although >not a quad its better than 'B') > >as you know what a quad tree is then you should be able to create a >much more balanced tree > >-----Original Message----- >From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED] On Behalf Of >Michele Bosi >Sent: Friday, May 23, 2008 11:27 AM >To: OpenSceneGraph Users >Subject: Re: [osg-users] Small object frustum culling > >On Fri, May 23, 2008 at 5:06 PM, Robert Osfield ><[EMAIL PROTECTED]> >wrote: > > >>Hi Michele, >> >>On Fri, May 23, 2008 at 3:58 PM, Michele Bosi <[EMAIL PROTECTED]> >> >> >wrote: > > >>>Thank you Robert, >>>v-sync is off, I get around 90-100 FPS, when enabled OSG stats I get >>>3.4 for "cull" and 6.4 for "draw", also in this case the frame rate >>>basically does not change but floats around the same range 90-100. >>>Since the performances are already very good I wont dig more into the >>>"problem", which might not be a "problem" but rather a lack of >>>understanding of what's going on. >>> >>>Another thing: I instance a single Geometry (my quad billboard) then >>>add it 4000 times to a Billboard node. I looked in the archives for >>>"quadtree" but coulnd't find any info. How can I use the quadtrees >>>you mentioned with OSG? Did you mean quadtrees to speedup frustum >>>culling or a particular parent/child layout for OSG nodes? >>> >>> >>I'm afraid I can't teach you about general real-time graphics work I >>have enough on my plate. >> >> >> > >Thank you Robert, I know you are swamped of work and deliver for free a >great service to the list, but I am afraid you don't need to teach me >anything about quadtrees, I regularly work with quadtrees and octrees >and implemented several of them. > > > >>There are lots of books and online resources on items like quad trees. >> Lots in the archives too. >> >> >> > >I looked in the archives through this web page: >http://lists.openscenegraph.org/pipermail/osg-users-openscenegraph.org/ >and there are exactly 0 results for "quadtree" and "quad-tree". > >My question was very clear, and it has to do a lot with OSG and a few >with quadtrees but probably it was a misunderstanding. > >In your mail you said: "Also with your scene graph, make sure you build >a quad tree to store all those billboards, and avoid large flat node >contains lots of children/drawables". >Did you mean, "OSG has a quadtree class somewhere, use it" or >"implement your own quadtree scene graph management, integrate it with >OSG culling mechanics, and put your billboards in it"? > >Michele > > > >>Robert. >>_______________________________________________ >>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.o >rg > > >_______________________________________________ >osg-users mailing list >[email protected] >http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.o >rg > > > _______________________________________________ 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
