hehehe but you know what it take for them to do that uh ?
it is a lot of work and as Martin stated in his tutorial, this technique has limits
wouldn't it be great for them to just sit on the ground ?
or just feed them with the compute terrain so they can follow it without having to go through several programs to get an image map and blablabla ?
anyway, as you said, it works... but it is just a pain in the ass' technique right now