clipka wrote:
> If your work packages are large enough, then these are no issues. But in 
> a raytracer, be prepared for rather small work packages.

And that's another problem.  While a GPU has *hundreds* of cores that 
all work in parallel, in raytracing you're unlikely to encounter more 
than a few dozen rays which require the same test.  It's just not 
efficient to solve this problem with GPUs.

Note that, while GPGPU has come a long way in recent years, the only way 
to make it more useful for POV is to make it more like a CPU and less 
like a GPU.  While GPUs in general may go this route in the future (Tim 
Sweeney thinks so), really GPUs will focus first and foremost on what 
games need... and games don't need raytracing yet.

...Chambers

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