My enemy is not tirggering OnTriggerEnter2D

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#1

For some reason my tagged enemy with a box collider trigger is not triggering the OnTriggerEnter2D in my bullet script. As a test I set the ladder to an enemy, since it is a trigger as well, and it worked fine.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class BulletBehavior : MonoBehaviour
{
    [SerializeField] float bulletSpeed;
    Rigidbody2D bulletRigidbody;
    PlayerMovement player;
    float xSpeed;

    void Start()
    {
        bulletRigidbody = GetComponent<Rigidbody2D>();
        player = FindObjectOfType<PlayerMovement>();
        xSpeed = player.transform.localScale.x * bulletSpeed;
    }

    // Update is called once per frame
    void Update()
    {
        bulletRigidbody.velocity = new Vector2(xSpeed, 0f);
    }

    void OnTriggerEnter2D (Collider2D other)
    {
        Debug.Log("wazzup?");
        if (other.tag == "Enemy")
        {
            
            Destroy(other.gameObject);
            Destroy(gameObject);
        }
        
    }

    void OnCollisionEnter2D(Collision2D other)
    {
        Destroy(gameObject);
    }
}
#2

Hi Beepone,

Did you share a screenshot? If so, it seems to be broken. :frowning:

Without seeing what you wanted to show, I’m just guessing what the problem might be: One of the game objects involved in the collision event does not have a trigger collider.

Also check if messages are enabled in the Console. For testing purposes, you could log a message which are definitely supposed to appear, e.g. in the Start method.

#3

If thats your bullet selected in the inspector, its not a trigger collider, it might work if you check the box

#4

I’ve tried that, neither worked. In the video, Rick leaves it unticked, and it works fine. The weird part is that it works when I set the ladder to the enemy, since it also uses a trigger. Both the slime and the ladder have triggers and only the ladder actually makes the OnTriggerEnter2D actually proc. The slime wont send the debug.log message even though I don’t have it nested in the Enemy tag IF statement. So I know the slime isn’t causing a trigger at all.

#5

I shared a gif. If you click it, does it still not work? It should be a link.

The slime has a trigger collider. I’ve turned it on and off many times, but it definitely has the one because I needed one to cause the slime to turn. I even at one point set its body collider to a trigger and it still didn’t work.

It feels like unity doesn’t think my slime exists.

#6

And what if you put it like this?

if (other.gameObject.CompareTag("Enemy")) 
{ 

}
#7

Doesn’t work. The problem is the trigger on the slime isn’t triggering OnTriggerEnter2D. When I shoot at the slime it does not send a debug log. But I know it is working because the ladder is triggering the log. Somehow the slime, even though it has a trigger, is not triggering OnTriggerEnter2D. This feels like a bug to me. I even remade the enemy gameobject from scratch and it still doesn’t cause a trigger even though the trigger to make the object turn is working in the slime itself.

#8

I dont remember the lecture it was on, but run through your colliders, and see if its right with this chart;

image
image1600Ă—900 355 KB

#9

Like, for trigger one need to be a trigger, and if you have 2 triggers one needs to have a rigidbody i believe. I know i struggled with some of these things when i just started too, its quite confusing.

If this still doesnt help, if you can provide screenshots of the colliders and rigidbody, i can take another look, and maybe tell you more.

#10

I think I found the issue, and it might just be a bug with unity. I swapped the collision layer to ladder on the slime like the ladder and it worked. I think the layout of my collision matrix is bugged because I’ve been noticing all sorts of wonk stuff like the bullet destroying itself even though I disabled it in the matrix. Right now I have it so the bullet can only pass through the NPC but it seems to be only working for the ladder layer somehow…

This doesn’t make any sense

#11

Ah, i didnt assume the problem would be there.
Glad you found the solution anyways, good luck with your project!

#12

From my understanding, I thought this mean’t the bullet can only trigger or collide with something on the NPC layer.

#13

Do you know if this is a bug or something?

#14

The way you have it there in the settings, the bullet layer can only collide/trigger with the NPC layer yes, no other layers.

In the screenshot, your slime is on the ladder layer, should be on the npc layer then.

#15

Yes ok well it is currently colliding with pretty much everything except for the NPC somehow. Even when I turn the NPC off it still doesn’t collide with it and collides with everything. In fact, it seems nothing I change on there changes how the bullet interacts with the other layers. I restarted unity but its the same. Might just remake all my layers and see if that fixes it.

#16

You changed your bullet layer after the first gif you sent?

1 Like
#17

omfg… im an idiot

#18

How did I gloss over that I was about to pull my hair out…

#19

I can say, nearly everyone made mistakes like this when just getting started, its alot to take in :wink:
Dont worry about it.

#20

ty so much, was about to go get a different version of unity thinking it was a bug… lol

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