This paper from 2008 looks very interesting, but I don't understand the math well enough, nor do I know glsl.

https://hal.inria.fr/inria-00288758/en [hal.inria.fr]

He also has documentation here:
https://ebruneton.github.io/precomputed_atmospheric_scattering/ [ebruneton.github.io]
along with c++ and glsl code.

Does anyone know if any of this has been or could be implemented in VEX? Or would this kind of thing need to be written in c++ and called from VEX?

Can any of you gurus tell if there are significant shortcuts here that wouldn't work in mantra rendering well?

Dave