This is brilliant work, with some tweaking to the nodes in the planetary shader and playing with the cloud values and also replacing the atmosphere with a somewhat-physically-accurate volumetric node set I saw from this helpful post I was able to put together one of the most convincing planet results I’ve seen in Blender.
The cloud and Terrain generation shaders worked near flawlessly after some tweaks I’ve made and with some compositing, I must thank you for this awesome new desktop picture I got here!
Some suggestions I have would be:
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add an invert node at the input for icecaps on the terrain node cuz right now it seems like it only works correctly with negative values which might be confusing
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adopt the realistic volumetric node setups for atmosphere I’ve found from the link above
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find a way to break up the band-like terrain generation when the scales of noise are set to low
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somehow make the clouds have volume (?)