|
 |
Very interesting work, Andrew. Be sure to test it on radiosity scenes.
Since POV-Ray's radiosity depends on shooting large numbers of rays, your
method should have a noticable effect. Keep us posted, and release the full
modified set of source files rather than those stinky diffs :)
Thanks,
George
> Hello all,
>
> I've been thinking about writing a patch for some time, but only in the
> past
> month have I taken some time to do the research and put one together.
> What
> I've implemented is a BSP tree data structure that can be used in place
> of
> the bounding volumes/light buffer/vista buffer to improve raytracing
> performance. The premise is that for scenes with many objects, a lot of
> time is spent sorting the bounding box intersections from front to back,
> and intersecting bounding boxes that may later be discarded. With a
> spatial subdivision like a BSP tree that partitions *space* instead of
> *objects*, there is no need for a sort on the length of the ray, as the
> space can be efficiently traversed in order, and few additional bounding
> box intersections are required than those in front of the final object
> intersection.
>
> I've put together the patch as a set of diffs (following the example of
> the
> previous patch posted here). The patch can be found at
> http://povplace.addr.com/bsppov.tar.gz
>
> Since many people will not be able to make heads or tails of what to do
> with
> (the diffs), I am working on a Windows binary.
>
> There is some more information about the performance improvements on
> scenes
> included with POV-Ray in the README file in the package. In general, the
> patch produces the largest performance gain on scenes with large numbers
> of
> simple-to-intersect objects (as high as 70% improvement). I have not
> observed a scene that renders slower with the new data structure.
>
> There is still lots of room for optimization for the patch, and I am
> working
> on having it work on objects with some internal structure like meshes.
>
> Andrew Clinton
>
>
--
Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/
Post a reply to this message
|
|
