...just thinking aloud, I was playing a lot with WoW mod servers, not to mention them now here, and at the beginning there was a mayor problem with NPCs clipping buildings etc. later that was fixed pretty easy, giving invisible collide map that NPCs used to calculate routes. That would be a nice addition to current zombies, right now there is no clipping through concrete fences, that's a starting point. Make one or two members run map and make those clipping fences where buildings are, and make use of doors, if closed no passage... Also, when zombies see me once, I simply cannot get away from them, they just follow me never giving up. Shouldn't there be a max range at wich zombies could notice something. You can't go near them and silently pass, they will see you. And when there is no line of sight, they should stop following me, or do they have sense of smell so they can smell where I run? Cheers...