For my next game I want to make a zombie game so of course I need to have a Zombie AI. I have never done an AI of this sort though so I am trying to find examples on how to do it. I have looked at some examples and bought a couple on the clicker store, but all of them have serious flaws that would not make them quite the quality for a proper game that is sold on Steam etc.
Most importantly I need a zombie AI that make the zombies able to get around walls without trying to "push" their way through the wall and slide a long it until they reach an exit. They should be dumb (they are zombies), but still be able to traverse around the environment.
Have anyone dibbled in this and know if there is any competent zombie AI examples out there or what would be the best steps to try to create one? Are some extensions essential if trying to do such a task?