Hi Sébastien, as starting point we should think about only static scenes, not morphable objects. And for speed up line intersection tests we may can append a kd-tree or at least a spatial datastructure. i am sure that then your ray tracer would be faster than 20k. Event for motion model using intersection tests (terrain, model, ...) becomes faster, i had once a model with 100k triangles in the same geometry and the osg fps drops unter a usable limit. then i start looking for the issue and i believe now, that this was of the linear in time intersection test. after removing the intersection test, the frame was greate. the bootle neck was located.
/adegli 2007/10/2, Jean-Sébastien Guay <[EMAIL PROTECTED]>: > > Hello Adrian, > > > I am not yet sure how we should change the osg internal data structure, > at > > the moment we store vertices in simple arrays. I feel like to remap them > > into an kd-tree. then the whole scenegraph is organised in a spatial > data > > structure. > > I agree, something like that would be great. If the goal is just to be > able to take a raytraced screenshot, a kd-tree might be workable, but > if we want to try and get some kind of realtime or quasi-realtime > raytracing going, we'll need something we can rebuild faster than a > kd-tree, or perhaps a kd-tree for anything tagged as STATIC and a BVH > for anything tagged as DYNAMIC... > > I've done some raytracing with OSG but I don't have time to implement > anything like that - my thesis is due "as soon as possible" :-) So I > just used osgUtil::LineSegmentIntersector out of the box, and as you > might guess the speed is not that great. In a simple scene I get only > about 20k ray/triangle intersections per second. > > If there was real interest in something like this, I would be glad to > help with the implementation, but as I see it, it will only be used in > very few cases... > > J-S > -- > ______________________________________________________ > Jean-Sebastien Guay [EMAIL PROTECTED] > http://whitestar02.webhop.org/ > > ---------------------------------------------------------------- > This message was sent using IMP, the Internet Messaging Program. > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > -- ******************************************** Adrian Egli
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