Some procedural skies rendered in Indigo.
Top one uses an atmospheric scattering simulation, bottom one is just a cloud scattering model in front of the usual physical sky background approximation.
Clouds are constructed using procedural Perlin noise of several frequencies.

Will post more info in a blog post soon.

On the topic of non-uniform scattering, is there anything in particular people want to see? (Volume emitters should be doable as well.)

Wow looks very interesting!

I'm greatly anxious to see more about it!

And I hope it'll find its way in one of the next releases soon.

Wow, it looks beautiful, gorgeous, wonderful, awesome!!!

Erm, ...

looks awesome! i definitely like the top one. very surreal. be nice to see it completely smooth.

thats totally awesome dude!!!!!
The implementation of both modes would be nice too

How about render times / Muts per pixel compared to an cloud free sky?

Would love to see the atmospheric clouds rendering longer

now I have to stay drunk till first 0.9t1 release, to avoid getting lost in total hysteric impatience

Top image is ~ 6 hours, 2 threads, Core ~1.6 Ghz
Bottom image is a few hours on same.

There's a lot of work to do on making the sampling more efficient tho.

Great idea!
But almost out of beer.

They're GREAT!!!
(I prefere the upper one)

"a few hour on same" = more or less than 6 hours?

(btw: FINALLY )

a few hours = i can't remember how many exactly, i think 2 or 3

finally... heh
I have more free time now, so I finally got round to doing the sky thing

Another thing... This is still in the very early stages. I have no idea if my sky scattering coefficient constant is correct; it may be off by several orders of magnitude.

And another cool thing.. in the top image, the camera is two meters above a 6300km radius sphere - the whole earth is modeled, and shots from space should be possible

Damn, that would be so cool!

O.o!!
With day and NIGHT?
And:
There automatically is an "infinite plane", which is a huge (earth)-sphere[oid]?

OMG!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! INCREDIBLE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

(Now, a huge texture is missing xD)
[ok, and different settings, like "Venus" "Mars".... and CUSTOM!!!!!]

You really do incredibly great work!

Well.. i guess if you position the camera on the other side of the sphere from the sun, it will be night
I guess i need to add some stars....
Also.. .to get a little crazy, and if the precision of the floating point numbers holds up, I could model the moon as a big sphere

O.o Moon!

*turning into a werewolf*
*hoooooooooooooooooooooowwwwwwwwwwwwwwwl*

That's crazy! Don't forget the craters!

OMG! If you realize all this stuff, Terragen will be not longer needed

*very exited*