> I'm just thinking that if the CPU has to intervine that much, the PCI bus 
> is rapidly going to become a bottleneck to the whole system.

It seems that current GPU raytracers are 5-6x slower than CPU ones:

http://graphics.stanford.edu/papers/gpu_kdtree/gpu_kdtree.ppt

So there doesn't seem to be much benefit, even if you could easily utilise 
the GPU from POV.

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scott wrote:

> It seems that current GPU raytracers are 5-6x slower than CPU ones:
> 
> http://graphics.stanford.edu/papers/gpu_kdtree/gpu_kdtree.ppt
> 
> So there doesn't seem to be much benefit, even if you could easily 
> utilise the GPU from POV.

I vaguely recall this came up on one of the Haskell lists recently. 
Discussion along the lines of

- Team X wrote a raytracer and it was 5x slower on the GPU than on the CPU.

- Team Y write another raytracer with was 2x faster on the GPU than on 
the CPU. Team X just did the job badly.

I don't have any references tho...

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