This is the behavior tree for my enemy AI. I'll summarize what's happening in plain English. If the enemy can see the player, it moves to the player's location and shoots every second. If the enemy can't see the player, but knows the location where it last saw the player, it moves to that location. If it can't find the player after getting to the last known location, it goes back to its original position. The values that determine which action the AI takes are set with C++, as shown below.