Unfortunately I can’t A month ago I went to fetch the latest dev-rendering changes and the compile failed. Thinking it was because I updated VS2019 I’ve been trying to compile the engine ever since with the new changes, but haven’t been successful. Not sure what the issue is honestly…
The material isn’t as complicated as you might expect, it’s just two 2D textures (one noise for the “blanket” of clouds on the ground, and one random circle gradient texture for the big lightshafts) projected in worldspace and then on top of that I have two panning volume noise textures cutting parts of the clouds out so it looks like they’re moving. I just used the volume noise textures that come with unreal (enable the volumetrics plugin if you want a couple more)
The light shafts are just a regular cloud volume, all I did was plug it into emissive. I used it to very surreal effect there but Ryan Brucks combined it with (I think) a sphere mask that changes location to get some pretty neat cloud lightning effects.
Overall working with it is almost exactly the same as working with a volume material for volumetric fog that is currently in 4.25. So if you want to start experimenting without 4.26, just turn on volumetric fog and throw a volume material on a cube. The main difference is that there are some super nice convenience data inputs for clouds, namely the normalized cloud height.