For different reasons, I have decided to use different ring thicknesses 
according to the views. Overviews - like this one - uses thicker rings 
than close ups. This implies also different ring parameters.

Here, the ring structure is conspicuously determined by the method 3 
scattering media with a wave density pattern. This last also uses a 
density map with real colours taken from a ring photograph. They are 
much subdued here, I guess because the ring particles are of a uniform 
texture ans should also bear the same pigment map pattern. Something I 
need to test.

My first image using alpha version 3.71, incorporating the new 
brilliance code in radiosity and in finish. However, settings are 
conservative so nothing really different is visible at present.

I wanted to test the non-linear gradients but was unable to make it 
work. From Clipka's note I assumed it should be added to the color or 
pigment map blocks but that gives an error, as also added to the pigment 
block. I need some guidance here.

-- 
Thomas

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