How to use OnCollisionEnter, OnCollisionStay and OnCollisionExit

Hi!

The following package demonstrates my problem.
TestOnCollisionEnter.unitypackage

Whenever I include OnEnable() in my script, I'm unable to respond to collision events.
I also expect to be receive collision events, while using WaitForSeconds().

The scene looks like this:

• Two boxes collide almost immediately after the scene starts.

• One of the boxes is falling by gravity, the other is kinetic.

• Both boxes have a collider and a rigidbody.

• One of the boxes have the following script.

    import UnityEngine
  

    import System.Collections
  

    class BusyCollider (MonoBehaviour):
  

        // def waitAndSee() as IEnumerator:
  

        //     Debug.Log("waiting...")
  

        //     yield WaitForSeconds(2.0f)
  

        //     Debug.Log("done!")
  

        //
  

        // def OnEnable():
  

        //     StartCoroutine(waitAndSee())
  

        // def OnEnable():
  

        //     pass
  

        def OnCollisionEnter (other as Collision):
  

            Debug.Log("CollisionEnter")
  
  

My results:

• Case 1: using the code as it is, OnCollisionEnter() gets called.

• Case 2: if OnEnable() exists, OnCollisionEnter() does not get called.

• Case 3: if OnEnable() starts a coroutine that waits while the boxes collide, the result is the same as in Case 2.

Why does not OnCollisionEnter() get called? Can I also expect OnCollisionEnter() to be called in Case 3? Any help is appreciated.