OnCollisionEnter() not working in Unity3D

Question

I have an object with a mesh collider and a prefab with sphere collider. I want the instance of the prefab to be destroyed if the two collide.

I wrote the following in a script:

private void OnCollisionEnter(Collision c)
{
    if (c == target)
        Destroy(transform.gameObject);
    print("something");                   // Doesn't get printed
}

But it is not working. I have tried toggling isTrigger on both the objects.

Answer 1

Have a look at this table

If you want your OnCollisionEnter to be called make sure:

(a) Both objects have a collider attached.

(b) None of the objects is a trigger collider (this will issue OnTrigger function & not OnCollisionEnter)

(c) One of the objects (doesn't matter which of them) is a rigid, non kinematic & non static object (the second don't have to be a rigid body).

(d) Due to computational difficulties MeshCollider might have hard times colliding with other mesh collider, use them with caution.

(e) Make sure both the objects are in the same layer (or at least that they collide in scene settings).

(f) If you are working in 2d - OnCollisionEnter2D will be called, rename your function.

Answer 2

I had the same problem of OnCollisionEnter not being called and found this question.

For me, the problem was that I was making a 2D game so the answer is to use the OnCollisionEnter2D function instead.