I'm having trouble with Coroutines..

[MasterTsif]

Hey there! I have this lines of code and all i want it to do is to wait for 2-3 seconds before the new scene loads when the objects collide.

public class DestroyByContact : MonoBehaviour {

	public GameObject explosion;
	public GameObject playerExplosion;

//	int score;


	void OnTriggerEnter(Collider other) 
	{
		if (other.tag == "Boundary")
		{
			return;
		}
		if (other.tag == "Player")
		{
			Instantiate(playerExplosion, other.transform.position, other.transform.rotation);

			StartCoroutine(WaitMe());
			//score store in PlayerPrefs
		

		}
		Destroy(other.gameObject);
		Destroy(gameObject);
		Instantiate(explosion, transform.position, transform.rotation);

	}

	IEnumerator WaitMe()
	{
		PlayerPrefs.SetInt ("score", GameObject.FindWithTag ("GameController").GetComponent <GameController> ().score);

		yield return new WaitForSeconds (3f);

	}


}

[fafase]

I think your problem is that you are destroying the object that is running the coroutine.

void OnTriggerEnter(Collider other) 
{
   if (other.tag == "Boundary")
   {
     return;
   }
   if (other.tag == "Player")
   {
     Instantiate(playerExplosion, other.transform.position, other.transform.rotation);
     StartCoroutine(WaitMe());
     //score store in PlayerPrefs
   }
   Destroy(other.gameObject);
   Instantiate(explosion, transform.position, transform.rotation);
   // Remove the visual object
   renderer.enabled = false;
}

IEnumerator WaitMe()
{
   PlayerPrefs.SetInt ("score", GameObject.FindWithTag ("GameController").GetComponent <GameController> ().score);
   yield return new WaitForSeconds (3f);
   // Destroy the object later on
   Application.LoadLevel(nextlevel);
   Destroy(gameObject);
}

[whydoidoit]

I presume you want to wait before doing the “Destroy Object Stuff” if the tag is the player. Easiest way here is to make OnTriggerEnter a coroutine itself - otherwise what you are doing is starting a coroutine - but the rest of your code carries on as soon as it yields (not after the time delay is finished)

public class DestroyByContact : MonoBehaviour {
 
    public GameObject explosion;
    public GameObject playerExplosion;
 
//  int score;
 
 
    IEnumerator OnTriggerEnter(Collider other) 
    {
       if (other.tag == "Boundary")
       {
         yield break;
       }
       if (other.tag == "Player")
       {
         Instantiate(playerExplosion, other.transform.position, other.transform.rotation);
         //score store in PlayerPrefs
         PlayerPrefs.SetInt ("score", GameObject.FindWithTag ("GameController").GetComponent <GameController> ().score);
         yield return new WaitForSeconds(3);
       }
       Destroy(other.gameObject);
       Destroy(gameObject);
       Instantiate(explosion, transform.position, transform.rotation);
 
    }
 
 
}