Hi Terje,
No worries, it was just an attempt.
Without reading your reply I played a bit with it in the last hour. See below.
This example has a bit of the branching and sharp ridges you mention.
After reading your reply I see what you mean.
I know that image, it's pretty cool
Without looking at the textures I think this should be possible.
My first guess is a low-octave lowish persistence ridged perlin noise as a base.
Then the erosion should be masked out to taper off at the maximum height.
Or perhaps you set erosion very high to get smooth slopes.
There are a couple of ways you can approach this.
I'lll have a further play with it
Martin
