We added a moss material layer to our rocks!
It has some nice parameters and should allow for really fast placement.
Its xyz-worldaligned so that we can use it for nice blends between meshes.
The parameters drive how much of the rock it covers, how strong the normalmap should influence the result and if there should be a color overlay on the edge of the intersection (for nice brown moss around the edges)
Vertex color is used to mask the whole effect by hand.
Let me know if this is something you would be interested in seeing a breakdown for.
Ill do one… someday… 😀