See also this perl submission for icfp contest 2000. Admittedly it's not the same, it's a simplified (fast) ray tracing task which does not consider rays that are diffusely reflected more than once or that are reflected at least once before diffusely reflected.

In reply to Re: Minilight, a minimal global illumination renderer by ambrus
in thread Minilight, a minimal global illumination renderer by wazoox

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