Simple coroutine doesn't resume after setting renderer.enabled to false

Questions & Answers
1

Hello everyone,

I’m trying to make a bonus that starts with a trigger and last for one second. I’ve made a coroutine for that. here’s my simplified code.

Here’s what I get in the console :
About to StartCoroutine
disable
about to yield return WaitForSeconds(1)
back from StartCoroutine

And never get the “Just waited 1 second” log, as long as I have the ligne renderer.enabled = false or gameObject.SetActive(false). When I remove that line everyhting works perfectly… But I still need to hide the gameObjectand disable it’s collider.

void OnTriggerEnter2D ()
  {
    activated = true;
    Debug.Log ("About to StartCoroutine");
    StartCoroutine (MyCoroutine ());
    Debug.Log ("Back from StartCoroutine");
  }

  IEnumerator MyCoroutine ()
  {
    this.Disable ();
    Debug.Log ("about to yield return WaitForSeconds(1)");
    yield return new WaitForSeconds (1);
    Debug.Log ("Just waited 1 second");
  }

 void Disable ()
  {
    Debug.Log ("disable");
    this.collider2D.enabled = false;
    this.renderer.enabled = false;
    //gameObject.SetActive (false);
  }

Do you have any idea ?

2

Coroutines will only continue to run on an active GameObject.

With this set up as is you should see the following output

  • About to StartCoroutine
  • disable
  • about to yield return WaitForSeconds(1)
  • Back from StartCoroutine
  • *** 1 second delay ***
  • Just waited 1 second

Once you call gameObject.SetActive(false) you will stop execution at the first yield statement

There are a couple of options to resolve

  1. Call StartCoroutine on a separate GameObject that remains active
  2. Disable all components on your GameObject. Be careful with this approach, it has the potential to mess up the behaviour of other components if not done correctly.