Some quick help...

[bri]

I was looking at a book about volcanoes for a research paper, and in there was a very interesting picture. It was a crack in a very rugged, yet flat, area(imagine fake stones, if you will). Also, in the background were bigger hills. My questions are:

1) Is there a way to design a crack with functions or some other way? I don't know how to get the heightfield erode functions working, as none of them work for me.
2) Is there a way to get one area flat, like with a mask?

I'm not good with functions. I tried using them, but I never noticed a change.

Also, the crack is very smooth at the edges. If I can get a picture of it on my cellphone, I'll post it to show you guys, but that won't be until tomorrow. I hope you guys understand my description.

[Harvey Birdman]

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[bri]

1) I'd think the simplest way to create a crack would be with a displacement map, not with function nodes. Make a black image with a white streak (or the other way around), load it in an image shader and apply that to the displacement input of your terrain (or some shader).

2) Flatten terrain - http://forums.planetside.co.uk/index.php?topic=2614.msg26126#msg26126.

Thanks! I will go try those out.

[rcallicotte]

Hey, good idea! 

1) I'd think the simplest way to create a crack would be with a displacement map, not with function nodes. Make a black image with a white streak (or the other way around), load it in an image shader and apply that to the displacement input of your terrain (or some shader).