I mean why do you add heating system to something that do not need when the system is just "spawn zombies and go here"? Why not pushing the challenge further. Zombies seems to attack blocs were a stone has been thrown at, why zombies wouldn't try to attack things that make "heat" (when not spotting players)?Individual AI does not care or know about the "heat" map. The AI heat map code spawns a zombie and says go investigate over there. The zombie goes to the point and looks around, then wanders.