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On 17/02/2011, at 3:05 AM, Mike Pall wrote:

> FYI: Geoff Leyland has ported a minimal C++ raytracer and it takes
> only 130 lines in Lua. I'm using it for my benchmarks and it's
> quite competitive. Maybe he wants to post it for reference.

D'oh!  I thought it was already available, but no.  Well, it is now, from here:
It'd be great if someone fixed it up to use the FFI (I plan to one day, but the day doesn't seem to be coming fast)