attempting to get terrain like this for a pic im working on
(http://channel.nationalgeographic.com/staticfiles/NGC/StaticFiles/Images/Show/30xx/302x/3023_journey-edge-universe-4_04700300.jpg)
just wondering how i get the plateaus and crevasses.
would some one be able to give me some tips on how to do this
Voronoi noise. You'll start with a displacement shader. Add a scalar to colour node into the blend by input. Connect the voronoi noise called 'cell' into the input of the scalar to colour node. The voronoi noise will need two inputs. Get position in geometry for the input and a constant scalar for the scale input. The seed value, just type a number up to 6 digits long.
The constant scalar controls the size/scale of the voronoi noise. The displacement shader controls the amount of displacement. The image you posted would need a negative value for the displacement. Try 500 for the constant scalar and -750 for the displacement value. These can be altered to fit your scene, but it's a start.
You'll need to add more shaders for the 'texturing' of the landscape. I would use distribution shaders and/or surface layers to control where the further displacements have effect.
interesting
(http://i1141.photobucket.com/albums/n600/Rareden/1.jpg)
need to put a bit of smoothing on those edges and the crevasses are a little to wide
There are some rock structure tgc's/tgd's to be found here, which use a set of voronoi scales. Try to find them, a lot faster than figuring it out yourself.
You'll need to add more types of shaders into the terrain. All I provided was a place to start. It's not too bad considering I did not test this out, just wrote the method down from my head.
I doubt it'll help, but here's a thread I made a while ago while trying to model Pluto's moon Charon.
http://forums.planetside.co.uk/index.php?topic=10985.0
this is it so far, i used the planet u linked as a base
(http://i1141.photobucket.com/albums/n600/Rareden/tritonwip.jpg)