Atmospheres

[pablo-mayrgundter]

Could be bounded exponential fog to start with, but would like to use a good refraction model.

Found this:

https://stackoverflow.com/questions/31955731/how-to-make-an-atmosphere-using-threejs

But there's also the work of the guy at google for Earth/Maps:

http://www-evasion.imag.fr/people/Eric.Bruneton/ https://www.youtube.com/watch?v=0I7Af2Ev5iQ

[pablo-mayrgundter]

Bruneton work looks to require a refactoring to use three's shader system. Searching for alternatives, found this:

https://github.com/wwwtyro/glsl-atmosphere

Also has its own low-level gl system, but easier to read.

Was referenced from this huge list of gfx links: https://github.com/Gforcex/OpenGraphic

[pablo-mayrgundter]

https://github.com/wwwtyro/glsl-atmosphere

Have this shader integrated into a test threejs scene. Next up will be getting perspective right.

Here's some nice refs for that:

https://developer.nvidia.com/gpugems/gpugems2/part-ii-shading-lighting-and-shadows/chapter-16-accurate-atmospheric-scattering https://www.shadertoy.com/view/lslXDr https://stackoverflow.com/questions/28014922/is-it-possible-to-make-realistic-n-body-solar-system-simulation-in-matter-of-siz/28020934#28020934

[pablo-mayrgundter]

James Burke is open to using shared source for atmosphere and terrain on Mars Society VR work in 2021: https://youtu.be/5zG4F3a1BFM?t=168

[mgreter]

Maybe use https://github.com/THRASTRO/thrastro-shaders ? Demo: http://www.ocbnet.ch/thrastro-shaders/demo/demo-atmosphere.html And in case you didn't see it yet: https://www.ocbnet.ch/solsys-preview-latest :)

[pablo-mayrgundter]

Wow, solsys is very nice. Thanks for the pointer! Do you know who's working on it or where the code project is? I'm happy to collaborate!

And thx for the shader link too.. yeah, atmospheres and accurate orbits are top of my priority list, tho has been a while since I've had time.

[mgreter]

It's all my work (started about 7 years ago) and unfortunately I haven't yet made it to publish all the code. But some parts are already on GitHub (the shaders being the latest part that I published). Others are:

https://github.com/mgreter/astro.js https://github.com/mgreter/ephem.js https://github.com/mgreter/three.app

[pablo-mayrgundter]

Oh cool :) Well, astro looks like something I could use right off. I'll take a look next time I have a coding session!

I actually work in Zurich sometimes. I'd love to get coffee... I'll say Hi on twitter.

[pablo-mayrgundter]

Hi again! Your twitter DMs are disabled for me. I'm in Zurich for the month. Would you like to meet and talk code sometime?

[pablo-mayrgundter]

This would be amazing:

"THOR is the first open-source general circulation model (GCM) developed from scratch to study the atmospheres and climates of exoplanets, free from Earth- or Solar System-centric tunings"

https://arxiv.org/abs/1911.13158.. one of https://github.com/exoclime