Right so a photogrammetry project of a tree trunk. Reality Capture to scan, added some Megascans assets to fill up the
scene a little bit.
The moss is a atlas texture from megascans which I scattered with corona scatter. I extracted a densitiy map from the diffuse texture of the trunk. The trunk was made with Reality capture, only thing I did in Zbrush was remeshing and unwrapping. All the high details come from the scanning procces.
At first I had a 34 milion polygon trunk after which my system died :-), I reduced it to about 9 milion for the high detail mesh and extracted normals and displacement from it with Substance designer.