Enemy game mechanics
Now that our enemy is on a continuous patrol circuit, it's time to give it some interaction mechanics of its own; there wouldn't be much risk or reward if we left it walking around with no way to act against us.
Seek and destroy: changing the agent's destination
In this section, we'll be focusing on switching the target of the enemies' NavMeshAgent component when the player gets too close and dealing damage if a collision occurs. When the enemy successfully lowers the player's health, it will return to its patrol route until its next run-in with the player.
However, we're not going to leave our player helpless; we'll also add in code to track enemy health, detect when an enemy is successfully hit with one of the player's bullets, and when an enemy needs to be destroyed.
Now that the Enemy Prefab is moving around on patrol, we need to get a reference to the player's position and change the destination...