Thanks, guys.
This rendered in about an hour(1h7m, I think) on a dual core 2ghz. Ray trace everything.
Nothing too extreme.
I can post the .tgd with the models disabled. Just enable them and load Marc's trees, if you have them.
The overall settings for the renderer are very low, since they're only really required for GI and atmosphere quality here(RTE). Not that excessive GI was required, either, for this overly dark scene.
You can't see any ground so there's no need for extreme detail(0.3), and ray tracing takes care of the cloud nicely.
Also, AA was only 3 as well. It's all about optimizing.
A
little post work took care of the rest. This simply involved some fake distance blur and a tiny bit of selective foreground blurring in excessively noisy areas, there wasn't much, you'll see if you render it yourselves.
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EDIT: An old version of this technique is in my first public library from 2008.
