Unity 2D getting projectiles to regitser collisions

Questions & Answers
1

I have a project using 2D in which a character shoots projectiles, they are supposed to (among other things) collide with walls, and destroy on contact. My walls are sitting on a layer called “Walls Collide” and this is the code I have for the projectiles:

using UnityEngine;
using System.Collections;

public class Projectile : MonoBehaviour 
{
	public GameObject projHit;
	
	
	void Start () 
	{
	}
	
	
	void OnTrigger2D (Collider2D col) 
	{
		if(col.gameObject.layer == 1 << LayerMask.NameToLayer ("Walls Collide"))
		{
			//if it hits a wall, get rid of it
			Destroy (gameObject);
		}

Unfortunately, the projectiles pass straight through the walls without any response, they have a circle collider as they are in fact round, any ideas how to fix this?

2

I’m having some trouble with Unity’s collision system in 2D as well, but here are some things you can try:

  1. your function name is wrong. Try OnTriggerEnter2D(Collider2D col)

  2. step 1 only works if your wall is set up as a trigger. If not, try OnCollisionEnter2D(Collision2D other)

  3. If both of those didn’t work try this:

    Projectile is a rigidbody2D. 2D Collider , isTrigger set to False

    Wall is a rigidbody2D. Kinematic is set to off. GravityScale set to 0. 2D Collider isTrigger is set to True

This works for me.