Polling

One method to collect such information is polling. Polling consists of directly checking for the preceding information in the FixedUpdate method of our AI character. An AI character can just poll the information they are interested in from the game world, do the checks, and take action accordingly. Polling works great if there aren't too many things to check. To make this method more efficient, we may program some characters to poll the world states with different polling rates so that we do not stop polling at every frame for every character. However, as soon as the game gets bigger, polling is not enough anymore. Therefore, in more massive games with more complex AI systems, we need to deploy an event-driven method using a global messaging system.