Experimenting with different utilities, This scene is a combination of:

1) strands.exe by Sam Benge 
https://news.povray.org/povray.binaries.utilities/thread/%3Cweb.4c8d4d9b76e12d9dc003acd0%40news.povray.org%3E/?ttop=429399&toff=50

2) hf2iso by Jaime Vives Piqueres 
http://www.ignorancia.org/index.php/technical/tools-objects/heightfield-based-isosurfaces/

which, over the years, I have gradually adapted to my needs without 
changing the basic structure.

3) lightsys IV also by Jaime 
http://www.ignorancia.org/en/index.php?page=Lightsys


-- 
Thomas

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