Hey, Rafal, I might take back my thought about using media_attenuation in
the light source, since I think that matters only for the fading value used
within the light source itself. Not 100% positive about that.

Now I understand the appearance of your media better, that extinction value
being zero accounts for the extreme brightness on the lit sides.

I was trying out a similar test here immediately after seeing your image.
Found that it isn't as easy as it looks. You might want to try fade_distance
0.1 or 0.2 in the interior statement. I tried a index of refraction and
really messed it up. So... good luck with it!

Bob H.

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