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I have two C# scripts: AI - controls the AI horses, and LapTrigger - counts the laps for the player and the AI horses.

AI.cs

I have a private int lapCounter and a public void incrementLap() that simply increments the lap (well, it’s supposed to…).

LapTrigger.cs

I have a method, OnTriggerEnter(Collider other), that checks to see if other.tag is “player” or “AI”. If it’s the player, it just increments a playerLapCounter inside the LapTrigger script. If other.tag is AI, then I would like to call AI.incrementLap() but I have NO idea how to figure out which AI is was that triggered the LapTrigger.

I’ve tried creating an array of AI objects using FindObjectsWithTag(), but I still don’t know how to figure out which of those triggered the lap. I tried playing around with other, other.GetComponent, and MANY other things, but I haven’t found anything that gives me anything more than a Null Reference Exception. I’ve been able to assign “horse numbers” to the AI horses in the Start() method when the game itself starts, but I don’t know how to access the horseNumber property when the horse triggers the lap. For example, if the other.tag == "AI", then get the horseNumber, and then increment AIhorseArray[horseNumber].lapCounter (horseNumber isn’t visible to the player so horseNumber = 0 is okay).

I even thought about creating an array in the LapTrigger script that just stores the AI horses as they cross the LapTrigger. The first horse that crosses becomes AIhorse[0] and his lap counter is set to 1 (since he just completed a lap). However, I still have the same problem. The next time the horses come around (lap 2), how can I tell which AIhorse[?] it is? Or even if it’s a new horse or one that’s already completed a lap?

I hope this makes sense and thanks to anyone who can help me - even if it’s just a link to another post, tutorial, or anything that might help. If I had hair, I would have pulled it out already. I’ve been working on this for weeks!

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From OnTriggerEnter you get other, so using other.gameObject…(that game object’s hierarchy) gives you access to the gameObject that hit the trigger therefore you don’t need Find/Tag etc, you have the gameObject. If that solves your issue I’ll change this to an answer.

A better example is here, expand the part about accessing another GameObject/Script from trigger/collider hit (part II)