OnTriggerEnter working, but not working?!?

Unity Engine
1

Yeah, I know; confusing title. I have an OnTiggerEnter in my script and I put a Debug.log to test if it hits something, Yet it doesn’t print the log when the trigger collides with something. What’s even more strange, is that I made a Debug.log further in, testing if it hit a broken terminal that you’re meant to fix, and THAT log comes out fine! It’s really odd. This is the script;

using UnityEngine;
using System.Collections;

public class FireScript : MonoBehaviour 
{
	public float size;
	
	private GameControllerScript controllerScript;
	private GameObject levelController;
	private bool isFixed;
	private GameObject enemy;
	private NewEnemyScript enemyScript;
	
	void Start()
	{
		isFixed = false;
		particleEmitter.maxSize = 0.00f;
		levelController = GameObject.FindWithTag("GameController");
		controllerScript = levelController.GetComponent<GameControllerScript>();
		enemy = GameObject.FindWithTag("Enemy");
		enemyScript = enemy.GetComponent<NewEnemyScript>();
		collider.enabled = false;
	}
	
	void OnTriggerEnter(Collider other)
	{
		Debug.Log ("Trigger has hit something");//This one doesn't work...
		if (other.tag == ("Broken Terminal")  isFixed == false)
		{
			Debug.Log ("Collider has hit terminal");
			controllerScript.SendMessage("GameEnding");
			isFixed = true;
		}
		else
		{
			if(Input.GetKey("b"))
			{
				if(other.tag == "Enemy")
				{
					Debug.Log ("enemy got hit");//but this one does! Weird...
					enemyScript.SendMessage("ApplyDamage", 1f);
				}
			}
		}
	}
	
	void FlameFireUp()
	{
		audio.Play();
		particleEmitter.maxSize = 3.09f;
		collider.enabled = true;
	}
	
	void FlameFireDown()
	{
		audio.Stop();
		particleEmitter.maxSize = 0.00f;
		collider.enabled = false;
	}
	
	
}
2

The game object containing this script or one of the parents needs to have a rigidbody. Is that the case?

Edit: Unity - Scripting API: MonoBehaviour.OnTriggerEnter(Collider)

3

Thanks. : ) I thought it would be something obvious like that :stuck_out_tongue: :face_palm:

4

I had a similar problem while working on my turret system. My Enemy cube HAS a rigidbody and while I was moving my Enemy cube around, into and out of my turrets collider all has happy in Unity-ville. This was not the case if I moved my ship that was holding my turret. The OnTriggerEnter NEVER fired.

I don’t know if it’s because I’m moving my objects in the Editor and not via force or if the documentation is incorrect.

You can replicate it as follows:
Cube1 - has collider rigidbody (my Enemy)
Cube2 - has collider (my ship w/turret)
Drop a script on each with OnTriggerEnter

If you move Cube1 into Cube2, both scripts are triggered.
If you move Cube2 into Cube1, neither is called.

5

It was kind of weird with mine. The doc. said that a Rigidbody can be attached to EITHER collider, but I put one on the receiving end (the broken terminal) and it still didn’t work. Had to put it on the welder. Weird, but at least it works…

6

Indeed, I just watched (mostly listened to) the roll-a-ball tutorial series and the gist of it was that moving objects that don’t have a rigidbody cause a lot of extra work (constantly updating collision cache) so I’d guess the “golden rule” would be; If it moves, put a rigidbody on it.

Thanks for the thread

7

Apart from if you want a third person controller. I thought it might be a good idea at first, but then I remembered about the step offset… Hard to do with Rigidbody’s.

Thanks. I kinda feel a bit thick though, as the explanation was fairly simple :stuck_out_tongue: