I don't know. Moreover, I don't know blue nodes so I have to do strange and unusual
things to get results, so it must be a matter of luck. I've messed around a bit with different nodes and turned them on and off to see what they do.
As soon as I have something that works properly I will post the TG file here because at this moment it's a mess(I can post it now If you don't mind struggling through a lot of clutter). Also the basic terrain I use is not yet optimal to get really good results. For now it is mainly a matter of finding a good camera viewpoint, and that can take a while.