Coroutine runs immediately instead of waiting

I'm trying to create a Coroutine that pauses for 2 seconds for a respawn.

My coroutine is running, and I can see its output in the console, but it never waits - it runs immediately even though I am specifying a specific pause time. I've tried something similar with Invoke and THAT doesn't wait either.

What am I doing wrong?

Code (CSharp):

1. IEnumerator RespawnPlayer()
2.     {
3.         Debug.Log("hello world");
4.         yield return new WaitForSeconds(20); //obnoxious pause for debugging, yet above still prints immediately to console
5.      
6.  
7.     }
8.  
9.     void OnTriggerEnter(Collider other)
10.     {
11.         // avoid collision with the boundary collider
12.         if (other.tag == "Boundary") return;
13.  
14.  
15.         // boom! for the asteroid
16.         Instantiate (explosion, transform.position, transform.rotation);
17.         gameController.AddScore(scoreValue);
18.  
19.         // boom! for the player if he crashes into the asteroid
20.         if (other.collider.tag == "Player")
21.         {
22.             gameController.livesLeft -= 1;
23.  
24.             Instantiate(playerExplosion, other.transform.position, other.transform.rotation);
25.  
26.             if (gameController.livesLeft == 0)
27.             {
28.                 Destroy(other.gameObject);
29.                 gameController.GameOver();
30.             }
31.             else
32.             {
33.                 StartCoroutine(RespawnPlayer ()); // THIS DOES NOT PAUSE
34.             }
35.         }
36. }

 

How about this;

Code (CSharp):

1. IEnumerator RespawnPlayer()
2.     {
3.         yield return new WaitForSeconds(20);
4.         Debug.Log("hello world");
5.     }

 

^This, in your code the first thing it does is write the string to the console.

 

This didn't work for me either. I did try this earlier, but the debug line is never written.

 

Code (CSharp):

1. void IEnumerator RespawnPlayer()
2. {
3.   yield return new WaitForSeconds(20);
4. Debug.Log("Hello World!");
5. }

It ought to work perfectly fine...

There must be something wrong in your code. Post it here, so that we can view it and help you out.

 

Problem Statement:
Add a set number of lives for my player ship. When the ship is destroyed, I want to deduct 1 life from a counter, wait 2 seconds, then display the ship.

I'm using the 2D shooter tutorial as a starting point.

Note that the GameController contains nothing exotic; I just added another variable, GUIText, and method to update the number of lives remaining. This seems to work correctly in spite of the odd behavior of my Coroutine.

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class DestroyByContact : MonoBehaviour {
5.  
6.     public GameObject explosion;
7.     public GameObject playerExplosion;
8.     public int scoreValue;
9.     private GameController gameController;
10.  
11.     void Start()
12.     {
13.         GameObject gameControllerObject = GameObject.FindWithTag ("GameController");
14.  
15.         if (gameControllerObject != null) {
16.             gameController = gameControllerObject.GetComponent<GameController>();
17.  
18.                 }
19.  
20.         if (gameControllerObject == null) {
21.             Debug.Log("Cannot find 'GameController' object");
22.                 }
23.     }
24.  
25.  
26.     IEnumerator RespawnPlayer()
27.     {
28.      
29.         yield return new WaitForSeconds(4);
30.         Debug.Log("hello world");
31.  
32.     }
33.  
34.     void OnTriggerEnter(Collider other)
35.     {
36.         // avoid collision with the boundary collider
37.         if (other.tag == "Boundary") return;
38.  
39.  
40.         // boom! for the asteroid
41.         Instantiate (explosion, transform.position, transform.rotation);
42.         gameController.AddScore(scoreValue);
43.  
44.         // boom! for the player if he crashes into the asteroid
45.         if (other.collider.tag == "Player")
46.         {
47.             gameController.livesLeft -= 1;
48.  
49.             Instantiate(playerExplosion, other.transform.position, other.transform.rotation);
50.  
51.             if (gameController.livesLeft == 0)
52.             {
53.                 Destroy(other.gameObject);
54.                 gameController.GameOver();
55.             }
56.             else
57.             {
58.                 StartCoroutine(RespawnPlayer ());
59.             }
60.         }
61.  
62.  
63.         if (other.gameObject.tag != "Player")
64.         {
65.         // first destroy the laser bolt
66.         Destroy(other.gameObject);
67.  
68.  
69.         // next the asteroid itself and all children/attached components
70.         Destroy(gameObject);
71.         }
72.     }
73. }
74.  

 

You're destroying the game object, which also means any scripts attached to it, so there's no code running and therefore no waiting.

--Eric

 

I've been trying to wrap my head around this. That's why I put the conditional around the Destroy calls in OnTriggerEnter; I guess I haven't done that right.

 

So what makes the ship not display?

 

Thanks for the hints everyone. I *think* I have it now. Is there any non-obvious issue with the following? I paid close attention to the Hierarchy and noticed no rogue objects being created during and after the Game Over condition.

Code (CSharp):

1. IEnumerator RespawnPlayer(GameObject gameObject)
2.     {
3.  
4.         gameObject.SetActive(false);
5.         yield return new WaitForSeconds(2.0f);
6.         gameObject.SetActive(true);
7.     }
8.  
9.     void OnTriggerEnter(Collider other)
10.     {
11.         // avoid collision with the boundary collider
12.         if (other.tag == "Boundary") return;
13.  
14.  
15.         // boom! for the asteroid
16.         Instantiate (explosion, transform.position, transform.rotation);
17.         gameController.AddScore(scoreValue);
18.  
19.         //// boom! for the player if he crashes into the asteroid
20.    
21.         if (other.collider.tag != "Player")
22.         {
23.             // first destroy the laser bolt
24.             Destroy(other.gameObject);
25.  
26.  
27.             // next the asteroid itself and all children/attached components
28.             Destroy(gameObject);
29.         }
30.         else
31.         {
32.             if (other.collider.tag == "Player")
33.             {
34.                 gameController.livesLeft -= 1;
35.  
36.                 Instantiate(playerExplosion, other.transform.position, other.transform.rotation);
37.  
38.                 if (gameController.livesLeft == 0)
39.                 {
40.                     Destroy(other.gameObject);
41.                     Destroy(gameObject);
42.                     gameController.GameOver();
43.                 }
44.                 else
45.                 {
46.  
47.                     StartCoroutine(RespawnPlayer(other.gameObject));
48.                 }
49.             }
50.         }
51.        
52.     }