I’m having the same issue.
For now, I want to generate rocks only on the flatter landscape, not on the steep cliff faces.
I’m using the same setup [NormalToDensity]->[DensityFilter], but all my fiddling and tweaking of the values produces no real effect. The result now is either all-or-none.
FWIW: It was hard to find your post. Having a keyword like “slope” or “cliff”, or something similar in the title would have made for an easier search.
