glenn5700: Hey, that's pretty cool. It tends to look best at lower slopes as it breaks up into smaller outcrops of rock. I used a 2D Tree card setup population and rendered this. Can't see the "cracked face" much though. I wish I could figure ot a way to make the voronoi noise pattern larger with an increase in altitude. Any ideas?

have a get altitude shader.

plug it into a Y to scalar function, and plug that into a multiply scalar.

Into the multiply scalar add a constant scalar and set it to a number.

Add another multiplier, plug the voronoi scalar into this multiplier and the first multiplier into the other end.

Hey presto, the voronoi gets bigger as altitude increases - you just need to tweak the first constant.

You might also want to increase displacement amplitude with altitude, but I don't know that one, sorry.

This is, by the way, done from my head without a single look at the clip file, so it might be wrong.