>I know this has been brought up before, but I just found out about Gelato,
> http://www.nvidia.com/page/gz_home.html, NVidia's
> raytracing program that is able to utilize NVidia GPUs for parts of the
> rendering process. I was wondering if the same could be done for povray?

This appears to be at least technically possible, as they claim Gelato
"leverages the NVIDIA GPU as a floating point math processor".
I'm not sure how much reverse engineering it would take.

Gelato provides an API, but it's probably a wrapper for the whole renderer.
From the FAQ - "What rendering functions are run on the GPU?
NVIDIA does not disclose these details, and the answer is always
changing because of advances in both the hardware and the software."

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