Warp <war### [at] tagpovrayorg> wrote:
 >   Btw, you keep saying that the GPU could be used to speed up 
ray-triangle
 > intersection calculations, but what do you base this on?

Other people works like those I linked to?

 >   Raytracers, including POV-Ray, use complex container structures to 
speed up
 > ray-triangle intersection calculations (such as octrees or b-trees).
 >
 >   How can the GPU be used to speed this up? AFAIK when rendering in the
 > normal way, GPUs do not prune triangles like that, but instead all you
 > send the GPU to render is splashed into the screen as-is.

You're thinking of the GPU as solely a game engine, not a programatic 
processor.

 >   Now, would you kindly explain to me how the GPU can be used to speed up
 > ray-triangle intersections of a scene with millions of triangles in a
 > raytracer?

I'm sure you know Google, but out of the top of my head:
http://ompf.org/forum/viewforum.php?f=16
http://davibu.interfree.it/opencl/smallluxgpu/smallluxGPU.html

last one is implementing precisely ray-triangle intersections on GPU and 
btrees as containers.  Source code is GPL.

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