i cannot remember where i have seen this but i have a memory of a craggy rock cliff. i guess it was some sort of slate where you had all these layers protruding outwards making the surface look kind of like a pile of tiles.

this is what i have come up with so far. its a horizontal and vertical stretched voroin 4th neighbour pattern used for displace/bump. but it still looks very geometric. so i would like to know if you have tips for making this more irregular. maybe more bump nodes? or just some good surface colour settings?

thanks in advance
chris

Interesting you should ask this question as I'm working on exactly the same type of thing:

1. see the attached image
2. also check this image out http://www.renderosity.com/mod/gallery/index.php?image_id=1838272

It's a bit tricky when using displacement on curved or irregularly shaped objects/terrains.  I was able to come up with something by using World Cylindrical mapping with a Squares noise node.  I'm still working to try and perfect this and then I will Metanode the variables (e.g. roughness, spacing, etc) and then throw in into my Rock My World - Rock Generator. 

That looks great!

just when i thought i would not need rock my world :-)

your example looks very good and more in the direction i was hoping to be able to go.

i will try your settings and see what i am able to do.

i played around and this looks great. a new path to experiment ...

first world-cylinder mapping on a cylinder with square noise for bump

and then i tried the standard chipped material and reversed the bump direction with an opposite filter node.

now i am looking forward to the rock my world set as i find it very useful for learning to study materials from the pros!

Looking pretty good there lightning - I think you're on the right path