destroy and spawn various objects after certain time

Question

im trying to destroy and respawn them again on old position after a certain time by tag

problems:

• clones not destroyed
• objects dont spawn on the same place as before
• only spawn one after destroy various

    [SerializeField]
    private GameObject barrel;
    private Vector3 position;
    private Quaternion rotation;
    public int lifetime = 0;

    private void Update()
    {
        var obj = GameObject.Find("barrel");
        
        position = obj.transform.position;
        rotation = obj.transform.rotation;
        
        StartCoroutine(Spawn(lifetime));
    }

    private IEnumerator Spawn(int secs)
    {
        yield return new WaitForSeconds(secs);
        
        foreach (var b in GameObject.FindGameObjectsWithTag("barrel"))
        {
            Destroy(b);
            Debug.Log("barrel destroyed");
        }
        Instantiate(barrel, position, rotation);
        Debug.Log("barrel spawned");
    }

repository

Answer 1

If you want to destroy and respawn on the same position with a delay, you should use the built in delay on the Destroy function in combination with InvokeRepeating like so, but I would recommend changing the lifetime to something higher than 0:

[SerializeField]
    private GameObject barrel;
    private Vector3 position;
    private Quaternion rotation;
    public int lifetime = 1;
    private void Start()
    {
        var obj = GameObject.Find("barrel");
        position = obj.transform.position;
        rotation = obj.transform.rotation;
        //InvokeRepeating(string MethodName, float StartDelay, float RepeatRate)
        //This runs the Spawn(); function every 'lifetime' seconds with 0 delay at the start
        InvokeRepeating("Spawn", 0, lifetime);
    }

    private void Update()
    {
    //No need to run the coroutine every frame
    }

    private void Spawn()
    {
        var bar = Instantiate(barrel, position, rotation); //Spawn the barrel but keep a reference to it
        Destroy(bar, lifetime); //Destroy the barrel after 'lifetime' seconds
    }