New shader for cratertown terrain

[ChrisKrane]

Now with more sand and rocks!
Fix #518

[toberge]

omg it looks so good! 🎉

tried applying it to the menu terrain, but here the repetition becomes too obvious so I won't ask you to use this material there (yet):

[ChrisKrane]

omg it looks so good! 🎉

tried applying it to the menu terrain, but here the repetition becomes too obvious so I won't ask you to use this material there (yet):

I tried it too, and there are actually two materials for this (for some reason?), but yes the pattern is too obvious either way. Am considering making an adjusted version just for the menu terrain.