Hi,

we want to create many zombies at runtime for our current game project (zombie-fps). These zombies should spawn always in regions which the player can not see at the current position. We want to do it like Left4Dead did it.

Valve published a nice paper how they did it here: http://www.valvesoftware.com/publications/2009/ai_systems_of_l4d_mike_booth.pdf

There is a so-called "AAS" Active Area Set which we should also use. But how do we create such a thing? Has anyone a good idea besides "entity-trace-test"-things?