http://www.gamedev.net/community/forums/topic.asp?topic_id=497681
2008/6/8 Guy <[EMAIL PROTECTED]>: > Hello, > > Maybe it's arrogant of me to mention anything, but anyway… > > > > I don't know what kd-tree is, only guessing from your discussion, but if > as Adrian says the performance is a combination of building, and traversing > the tree, I think these sections should be implemented in generic classes so > their implementation could be easily replaced later. Like the callbacks > mechanism for example. > > > > Guy. > > > ------------------------------ > > *From:* [EMAIL PROTECTED] [mailto: > [EMAIL PROTECTED] *On Behalf Of *Adrian Egli > OpenSceneGraph (3D) > *Sent:* Friday, June 06, 2008 4:55 PM > *To:* OpenSceneGraph Users > *Subject:* Re: [osg-users] kdtree example > > > > Hi all, > > once we have a working version of kd-Tree, we can start a contest :-) there > exist hunderds of heuristics, tricks for traversing, and so on. Performance > of kd-Tree traversing depends not only the method of traversing, the > performance depends much more on the build strategy than on the traversing. > of course both are important, kd-Tree build and the software enginiering > tricks for fast traversing. > > :-) in my first kd-tree traversing algorithme, basic kd-tree i had about > 27s, after some optimisation i could do same thing in less than one second. > but i know some kd-tree based raytracing algorithme working much much faster > :-) > > /adrian > > 2008/6/6 Robert Osfield <[EMAIL PROTECTED]>: > > Hi Paul, > > > On Fri, Jun 6, 2008 at 3:20 PM, Paul Melis <[EMAIL PROTECTED]> wrote: > > As it is still work in progress you might have this on your list already, > > but changing the traversal to use a while loop with a stack rather than > use > > recursive calls on traverse() should increase intersection performance > quite > > a bit. > > Use a local stack rather than recursive is something I'm already > considering. The current build code uses recursion, and the intersect > traversal I'll implement initially with recursion for simplicity. > Once these are both working sweetly I'll implement the alternative non > recursive. > > Robert. > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > > > -- > ******************************************** > Adrian Egli > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > -- ******************************************** Adrian Egli
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