> The mm_per_unit is ONLY used for the new SSLT feature.

Thanks! This way I won't fear to change the scale of radiosity or photons along
with it. I was afraid it would change scale of all the rays and make radiosity
or caustics out of scale.

Why not name it "sslt_mm_per_unit" to have a better idea of what it does... ? I
aslo think that naming it sss instead of sstl would be less error prone but who
cares...


> I don't think that the algorithm is optimised for a value of 100, it's
> just the default value.

I get it, only the default value is mm_per_unit 10 (100 was what worked best for
my scene)

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