Navmesh?
AI pathing, a video made by Giskard of
The Engineering Guild details it exactly:
http://youtu.be/RlNBVOcuW3MBasically, its annoying for any content mods that introduces quests, npcs, new houses etc etc etc.
Oh, if you are interested in making mods, are a modder, or like BIG content mods made by excellent modders: Join The Engineering Guild
tis basically a troll-free modders forum with useful people
