Landscape animation question

[kafreyer]

So I'm pretty new to Terragen 2 so bear with me
Im trying to create a lanscape that has animated tectonic activity (ie http://www.youtube.com/watch?v=oIc_lgaa_Bg )
Ive been able to animate the landforms roughly but haven't gotten optimal results
I'm also trying to animate little landslides to heighten the realism but I cant isolate small areas to animate
is any of this possible?
Any help would be great
Thanks

[FrankB]

That should be possible. What have you tried so far? can you show the project file?

[kafreyer]

I haven't been saving my tests but here is my basic file.  Ive tried both using the terrain tool and shaders, seems like terrain is the way to go?

[FrankB]

no you're doing it wrong. There are many other ways, but generally you would want to animate the displacement.
Check out the attached file, where I have "planted" a simple shape shader in the middle of the heightfield and animate the displacement of the simple shape shader. Both are connected through a merge shader.

Hope that helps
Frank

[kafreyer]

great thanks that works perfectly. 
If i want to animate rocks falling off a rising surface or bits crumbling off the hill, is this possible? It is going to be timelapse footage so the materials wont need to fall through the air, just start at point a and end at point b.