The title says it all, how can you use AI planning in underground tunnels?
i dont know
You have to duplicate your .ter file: one for munge, and one for work. Back up your .ter for munge, and open zeroeditor with .ter for work. Make your terrain totaly flatt, and low. Add all planing and barriers, you need. Then, backup your terrain for work, and return .ter for munge.
Like Sereja said backup your old terrain first and create a new before loading your world by going into Terrain button in the Advance section.
Thanks guys, I'll try it.