> ...but how do I get realistic storm systems? The ones at "Seed of
> Andromeda" do not look very convincing, they would have to drag in
> clouds in a spiralling rather than a straight way (like with the
> black_hole warp of POV-Ray). Is there some trick to achieve a "spiral warp"?

So, I was clicking around on my new, minty-fresh Linux Mint install, and came
across the screen savers.  Most were written by Jamie Zawinski / jwz and the
source code for most or all of them are at:

https://www.jwz.org/xscreensaver/download.html

There are some very interesting ideas, implementations, and effects, and
"Distort" seemed to have a spiral effect.
The screen saver menu is a rich source of information, as each choice has a
description and URLs of articles on the web about the underlying system.

The specific URLs for the Distort screensaver were
https://en.wikipedia.org/wiki/Euler_equations_(fluid_dynamics)
and
https://en.wikipedia.org/wiki/Inviscid_flow

There are LOTS of very nice algorithms illustrated that have been talked abut
here in the forum, and might be likely to spark new interest in old topics.

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