DontDestroyOnLoad Example

Hi there,

In the following example: https://docs.unity3d.com/ScriptReference/Object.DontDestroyOnLoad.html

the DontDestroy.cs script looks like this:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. // Object.DontDestroyOnLoad example.
6. //
7. // This script example manages the playing audio. The GameObject with the
8. // "music" tag is the BackgroundMusic GameObject. The AudioSource has the
9. // audio attached to the AudioClip.
10.  
11. public class DontDestroy : MonoBehaviour
12. {
13.     void Awake()
14.     {
15.         GameObject[] objs = GameObject.FindGameObjectsWithTag("music");
16.  
17.         if (objs.Length > 1)
18.         {
19.             Destroy(this.gameObject);
20.         }
21.  
22.         DontDestroyOnLoad(this.gameObject);
23.     }
24. }

My question is why does it call `Destroy(this.gameObject)` before `DontDestroyOnLoad(this.gameObject)` if there are any gameobjects with the tag `'music'`?

Thanks

 

It is kind of singleton maneuver it ensures that only one gameobject with tag "music" can exist. Hence the obj.Length > 1. If you think about it, when
- there is 0 game object with tag "music" exists and this gets an Awake call: it won't be Destroyed since the obj.Length == 1, so it gets the DontDestroyOnLoad
- then in a next scene or on a reload of the current scene there is 1 game object with tag "music" and this game object gets created again (since scene load) the obj.Length will be 2 which is > 1, so the later game object will be destroyed so there can be only one

 

Oh I see, thanks Lurking-Ninja!