High!

Now as I got at least the planet's shadow on the unlit side of the rings 
  correctly, I wonder how I could have different degrees of transparency 
within the rings - like it is with the real Saturn. I tried adding a 
second density, now with a density_map instead of a color_map - but the 
only thing I observed were different colors, while the transparency 
remained uniform across all ring bands.

What is the difference between a color_map and a density_map within a 
density statement?

Could I achieve different transparencies by adding an absorption media 
with its own density_map? What values of that density map would affect 
transparency?

See you in Khyberspace!

Yadgar

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