How can I track positions of instantiated objects

Questions & Answers
1

Hi guys,

I’m new(ish) to unity and… need some help here.

My brain says something like this “should” work but it looks like unity doesn’t really like it :

	void Update () {
                //Oject that flies across screen from right to left
		GameObject obs;

		float leftScreen = Camera.main.orthographicSize * -1f;
                obs = Spawn ();
		//Shouldn't the below keep track of the position of obs?
                Debug.Log (obs.transform.position.x);

	}

        //Spawning method
	private GameObject Spawn () {
		int r = Random.Range (0, goList.Count);
		Particle = true;
		return Instantiate (partList [r], new Vector3 (Camera.main.orthographicSize+10, 0, 0), Quaternion.identity) as GameObject;
		Debug.Log (partList [r].transform.position.x);
	}

So what I need is an object that flies across the screen (camera view) from right to the left and when the object goes beyond the left side of the screen i want it to do a Destory (obs) on it.
But when I used obs.tranform.position.x it seems like unity isn’t keep a track of obs dynamically and only gets the starting point…

Is there any tips on what I may be doing wrong here and could you guys help me out?

Thanks in advance.

2

If you doing that. You will lose information of object that spawn before.

I recommand you this.

List<GameObject> objs = new List<GameObjects>();
void Update ()
{
     //Oject that flies across screen from right to left
     GameObject obs;

     float leftScreen = Camera.main.orthographicSize * -1f;
     obs = Spawn ();
     objs.Add(obs);
}

//If you want to track all object you spawn just do something like this
void OnGUI()
{
    foreach (GameObject go in objs)
    {
           GUILayout.Label(go.transform.position.x);
           //Or debug
           Debug.Log(go.transform.position.x);
    }
}

But It might slow down if you just spawn every update.

Maybe you can make it spawn everytime you press a key?

Like this

void Update ()
{
     if (Input.GetKeyDown(Keycode.F)
    {
         //Oject that flies across screen from right to left
         GameObject obs;

         float leftScreen = Camera.main.orthographicSize * -1f;
         obs = Spawn ();
         objs.Add(obs);
    }
}

And object will spawn everytime you press F key.

3

Thanks for the help :slight_smile:
Made a better starting point for me.