Following the discussion p.a-u on how to generate sediment layering 
without immediately requiring the use of isosurfaces, I have been 
playing a bit with different ideas.

First, in order to focus on something tangible, I got two Real World 
examples:
https://geologylearn.blogspot.com/2015/11/sedimentary-structures.html
https://blogs.egu.eu/divisions/ts/2019/12/27/features-from-the-field-bedding-stratification/

Then, I used Gimp to draw a rough b/w image. This image I loaded into 
GeoControl, my old heightfield generator, and exported a .tga image_map 
that I could use as height_field in POV.

A tentative result is attached here. Not bad for a first,I think. :-)

Note: Jaime Vives Piqueres is the author of hf2iso. I can recommend it 
if you want to play with isosurface landscapes.

-- 
Thomas

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