NPC pathing

[Mr B.]

Does anyone have information (NOT guesses) about NPC pathing?

At the moment they seem to end up in daft places, however do they just follow paths? As in just stay off terrain?

If not, it would be really good because then you could make it so they don't wander off into stupid places, fields etc.

And yes I know you can reduce range, but it would be nice to have them populate a place you build and not stay static.

[griffonwing]

I found an NPC on a rocky overhang above a deck. No way to get up there. I could barely manage it with a double-jump.