> This is how I want it.
>
> 2-pass render with a scattering media, but without area light in the
> second pass. Still +3hours render time with 6 threads. With an area
> light I judge from testing that render time would be multiplied by 10.
>
> Thomas

Coming along nicely.

As for the area light, adaptive is a must. Start with adaptive 0, and 
increase to adaptive 1 or 2 only if you have disturbing artefacts.
Looking at the actual scene, it's probable that adaptive 0 will be 
correct, with, maybe, some pixel sized glitches near the torch holder on 
the wall.

Most of the time, with adaptive 0, the time hit is barely larger than 4, 
even with high density arays like 17 * 17, 33 * 33 or 65 * 65.

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