Which AI finding enemy script is more efficient?

Questions & Answers
1

Hi everyone! So I’m trying to write an script to make an AI find an enemy constantly, but I’m doubting which script is more efficient:

  1. Use a sphere collider and check onTriggerEnter, onTriggerStay, and onTriggerExit methods to know when to attack.

  2. Use GameObject.FindGameObjectsWithTag(“Enemy”) to get al Enemies in the scene al later search which one is the closest to the AI. The problem is this method must be executed every frame with every AI in the secene and maybe is more inefficient than the Sphere Collider one.

So my question is, knowing there will be several AI in the secene, which script is more efficient?

Thanks!

2

First of all, for the second method you can maintain a list of List and tell enemies to add themselves and remove themselves from it and eliminate the need for GameObject.Find
Simple add yourself in Start and remove in OnDestroy in enemy script.

The performance depends on number of enemies, the number of other colliders in your scene and the amount of physics calculations in your game.
Profiling as suggested is the best option but i think most of the times, trigger is the fastest option.