A Moon

[AP]

I will be working on the rims but yes, the erosion should be possible as i have been pondering over it the past few days. A tightly clamped long flow channel should imitate the look closely. It would not be spot on but i'm not trying to be dead-on-accurate, just close. 

[WAS]

Yes, you need rims!
I've been thinking about the ejecta you mention, but never found a solution. It takes a mathematician to work out something like that, but it would be very cool. Perhaps Daniil's erosion shader can be used somehow (if based on "crater area round hillocks", and diverted off as a map only). Just theory.... so far.

That's actually a genius idea. Just a thoery, but you could use your craters as a mask for a heightfield generate. Use some sort of method to up the scale (while maintaining center) and then apply erosion. In theory that should give your crater-shaped eroded slopes out-wards. The ejection lines would be another layer with some sort of genius work.

[Mahnmut]

Actually I liked the first version better,
maybe an overlay or combination of both methods would look even better...

[Hannes]

Actually i liked the first version better,

Me too!

[AP]

The first one was a bit too warped in places but i need to find a better crater solution first.