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Question by franztango · Mar 24, 2015 at 07:37 AM · gameobjectdestroy

I want to destroy this gameobject when this gameobject is destroyed.

I'm a beginner in unity. I just want to ask about destroying a certain game object.

We have an assignment that if we destroy the three game object, the last game object will destroy.

Example: a door have a three targets. if you destroyed the three targets, the door will open.

These are my codes.

 using UnityEngine;
 using System.Collections;
 
 public class Fire1 : MonoBehaviour {
     //int ctr;
     GameObject player;
     // Use this for initialization
     void Start () {
         //ctr = 0;
         player = GameObject.Find ("Player");
         rigidbody.AddForce (player.transform.forward * 5000);
     }
     
     // Update is called once per frame
     void Update () {
     }
 
     void OnCollisionEnter (Collision col){
         if (col.collider.name == "Wall") {
             Destroy(gameObject);
         }
         if (col.collider.name == "Target"){
             col.collider.GetComponent<targetCounter>().setCtr();
             Destroy(gameObject);
         }
         if (col.collider.GetComponent<targetCounter> ().getCtr () >= 3) {
             col.collider.GetComponent<destroyCounter>().setCtr();
             Destroy (col.gameObject);
         }
         if (col.collider.GetComponent<destroyCounter>().getCtr()>=3) {
             Destroy (GameObject.FindWithTag("Door"));
         }
     }
 }
 

 using UnityEngine;
 using System.Collections;
 
 public class targetCounter : MonoBehaviour {
 
     int ctr;
     public Material green;
     public Material blue;
 
     // Use this for initialization
     void Start () {
         ctr = 0;
     }
     
     // Update is called once per frame
     void Update () {
     }
     
     public void setCtr(){
         ctr++;
         if (ctr == 1) {
             GetComponent<MeshRenderer>().material = green;
         }
         if (ctr == 2) {
             GetComponent<MeshRenderer>().material = blue;
         }
     }
     
     public int getCtr(){
         return ctr;
     }
 }


 using UnityEngine;
 using System.Collections;
 
 public class destroyCounter : MonoBehaviour {
     int ctr;
     // Use this for initialization
     void Start () {
         ctr = 0;
     }
     
     // Update is called once per frame
     void Update () {
         Debug.Log (ctr);
     }
 
     public void setCtr(){
         ctr++;
     }
     
     public int getCtr(){
         return ctr;
     }
 }
 

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Answer by Jessespike · Mar 24, 2015 at 03:13 PM

MonoBehaviour.OnDestroy

This function is called when the MonoBehaviour will be destroyed.

OnDestroy will only be called on game objects that have previously been active.

 using UnityEngine;
 using System.Collections;
 
 public class ExampleClass : MonoBehaviour {
     void OnDestroy() {
         print("Script was destroyed");
     }
 }

I suppose inside that destroy function you could add something like:

 FindObjectOfType(typeof(destroyCounter)).ctr++;

Expose your ctr variable as a public so you can access it from other scripts.

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