Question: 2D Rigidbodies Won't Collide

I am just getting started with Unity, making a simple game. I have two rigidbodies, a projectile and an object. I want the projectile to stop once it touches the object. However, it just clips through the object. I have tried changing the type of moving from transform + projectileSpeed to velocity + projectileSpeed but it still hasn't worked.

Here is the code for the projectile:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class dart : MonoBehaviour
{
public int dartSpeed;
public Rigidbody2D dartBody;
// Start is called before the first frame update
void Start()
{
dartBody.velocity = Vector2.right * dartSpeed;
}
// Update is called once per frame
void Update()
{
}

private void OnCollisionEnter2D(Collision2D collision)
{
Debug.Log("Dart Deleted!");
Destroy(gameObject);
}

}

and here is the code for the stationary object:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class Pipe : MonoBehaviour
{
public float moveSpeed = 5;
public LogicManager logic;
// Start is called before the first frame update
void Start()
{
logic = GameObject.FindGameObjectWithTag("Logic").GetComponent<LogicManager>();
}
// Update is called once per frame
void Update()
{

transform.position = transform.position + (Vector3.left * moveSpeed) * Time.deltaTime;
if (transform.position.x < -15)
{
Debug.Log("Pipe Deleted!");
Destroy(gameObject);
}
}
}

I have rigid bodies and colliders on both of them, with the object on the default layer and the projectile on layer 6. WHY WON'T THEY COLLIDE?!

 

I copied your scripts, put them on two game objects. One hits the other and disappears. Everything works as you assumed, so the problem is not in the scripts, but in the components.

It's best to create a Sample Scene, create two new game objects (e.g. based on Sprite -> Square), add Rigidbody2D, BoxCollider2D to them, and scripts at the end. Do not modify anything, just drag the Rigidbody2D into the Dart script, and set the bullet speed. This is the minimum to be met.

 

Thank you, I'll try to find out what's wrong.

 

You are bypassing the physics system by doing the above.

With Physics (or Physics2D), never manipulate the Transform directly. If you manipulate the Transform directly, you are bypassing the physics system and you can reasonably expect glitching and missed collisions and other physics mayhem.

Always use the .MovePosition() and .MoveRotation() methods on the Rigidbody (or Rigidbody2D) instance in order to move or rotate things. Doing this keeps the physics system informed about what is going on.

https://forum.unity.com/threads/col...-unity-physic-rigidbody.1216875/#post-7763061

https://forum.unity.com/threads/oncollisionenter2d-not-being-called.1266563/#post-8044121