Now if we hit Play, we should see the AI chase you until you've broken sight!

So, the bot will route as it did previously until an enemy is within sight. If the bot is in state 0, it will enter state 1 once an enemy is detected by the AI Perception component. Next, if one of these enemies is within sight and we have no current enemy, we will change our state to 2 and set our enemy. Lastly, we will continue to move toward our enemy until we lose sight of them, resulting in us being set back to state 0. The following diagram illustrates these transitions:

This is how we create AI without the assistance of Behavior Tree. Ultimately, you still need to create a state machine because this is the fundamental approach used in programming to create functions that transition among each other based on the variables shared by the functions. By doing this directly in blueprint, we can get a deeper understanding of the behavior-control mechanism based on state transition, and this is good for simple AI behavior.