Using 4.25.4 and the clouds look pretty good! No importing of anything needed etc. Just go to “Edit>Plugins” and the on the left side, go to “Built-in” section, scroll down and select “Rendering”. In the plugin list that gets populated to the right of that, check on “Volumetrics” and restart UE4. Outside of doing that, you should also enable “Show Engine Content” in the content browser view options (lower right hand corner of the content browser window). Then go to the below listed path and open the level:
File/Open Level…/Volumetrics Content/Sky/Maps
I will mention, that I was getting really frustrated with these example levels at first, as they are setup with all the parameter values juiced up to ridiculous and non performant settings! This would have been a good time to introduce a preset widget or some sort of toggle in the settings with of a couple different quality levels with the example levels here having been saved at the lower end, but instead, everything was maxed out and the fps was about 2fps as a starting point…
Once you slam the cloud detail amount down from the default of 16 to something like 3, you will have decent frame count and can begin testing out all the settings to figure out how the system actually works. It’s fun to mess with!
The one thing I would love to figure out, is how to slow the panning speed of the clouds way down… Scaling the clouds much higher with “scale relative to the earth” was not the solution… If anyone figures out the translation speed of the clouds, please let me know!
Cheers!
TC