Prefab clones behaviour

Questions & Answers
1

Hello everyone,

I don’t get how prefab instantiation works.
I’m coding a 2d vertical infinite scrolling and I made a script that continually create new tiles of background (prefab) at top and destroy itself when its at bottom.
Then each background instantiate a group of windows (prefab too). Later some window would be animated or scripted or whatever so it is important that each window is a different gameObject.

The problem is, each background seems to herit windows from the last background created. So 1st bacnkground has 3 windows, 2nd has 6, 3rd has 9… etc…

[29153-screen+shot+2014-07-13+at+15.28.37.png|29153]

like if all child were cloned too… but they dont exist in the prefab, I create them at runtime…

I’m sure I’m not using those prefabs the good way but that is my first Unity Project I don’t how to handle the all-situation so if you have any clue…

here’s my code :

using UnityEngine;
using System.Collections;

public class bg_parallax : MonoBehaviour
{
	static public Vector2 		speed = new Vector2 (5, 5);
	static public Vector2 		direction = new Vector2 (0, -1);
	public GameObject 	background;
	public GameObject 	window;
	private bool		needChild = true;
	// Use this for initialization
	void Start ()
	{
		((GameObject)Instantiate (window, new Vector3 (-1.8f, -1.5f, 19f), transform.rotation)).transform.parent = transform;
		((GameObject)Instantiate (window, new Vector3 (0f, -1.5f, 19f), transform.rotation)).transform.parent = transform;
		((GameObject)Instantiate (window, new Vector3 (1.8f, -1.5f, 19f), transform.rotation)).transform.parent = transform;
	}

	// Update is called once per frame
	void Update ()
	{
	}

	void FixedUpdate ()
	{
		transform.Translate (new Vector3 (speed.x * direction.x, speed.y * direction.y, 0) * Time.deltaTime);
		if (needChild && transform.position.y <= 0) {
			((GameObject)Instantiate (background, new Vector3 (0, transform.position.y + renderer.bounds.size.y, 20), transform.rotation)).transform.parent = transform.parent;
			needChild = false;
		}
		if (transform.position.y <= renderer.bounds.size.y * -1)
		{
			for(int i = 0; i < transform.childCount; i++)
				DestroyImmediate(transform.GetChild(i).gameObject);
			Destroy (gameObject);
		}
	}
}
2

The clue is the (clone)(clone)

You are calling instantiate on the existing GameObject, not the prefab. Each time you clone a GameObject it clones all of its children as well. Make sure you have the prefab assigned from the folder structure. Not an instance of the prefab from the hierarchy.