Hi i am newbie in Unity and i have a problem about prefabs destruction.
I’m making a 2D infinite runner where the map is generated by a random sequel of prefab. When my character doesn’t see the old prefab, i want to destroy ( to avoid memoy explosion ).
So I used this script ( used in a tutoriel ).
I have no problem with the simulation of the game. However, when i build it, the prefabs are generated the first time but when i die and restart, nothing is generated.
I read that i have tocclone my object or something like that but i didn’t find how to do. Can you help me ? 
This is the script i used :
using UnityEngine;
using System.Collections;
using System.Collections.Generic;
public class GeneratorScript : MonoBehaviour {
public GameObject[] availableRooms;
public List<GameObject> currentRooms;
private float screenWidthInPoints;
// Use this for initialization
void Start () {
float height = 2.0f * Camera.main.orthographicSize;
screenWidthInPoints = height * Camera.main.aspect;
}
// Update is called once per frame
void Update () {
}
void FixedUpdate () {
GenerateRoomIfRequred();
}
void AddRoom(float farhtestRoomEndX)
{
//1
int randomRoomIndex = Random.Range(0, availableRooms.Length);
//2
GameObject room = (GameObject)Instantiate(availableRooms[randomRoomIndex]);
//3
float roomWidth = room.transform.FindChild("floor").localScale.x;
//4
float roomCenter = farhtestRoomEndX + roomWidth * 0.5f;
//5
room.transform.position = new Vector3(roomCenter, 0, 0);
//6
currentRooms.Add(room);
}
void GenerateRoomIfRequred()
{
//1
List<GameObject> roomsToRemove = new List<GameObject>();
//2
bool addRooms = true;
//3
float playerX = transform.position.x;
//4
float removeRoomX = playerX - screenWidthInPoints;
//5
float addRoomX = playerX + screenWidthInPoints;
//6
float farhtestRoomEndX = 0;
foreach(var room in currentRooms)
{
//7
float roomWidth = room.transform.FindChild("floor").localScale.x;
float roomStartX = room.transform.position.x - (roomWidth * 0.5f);
float roomEndX = roomStartX + roomWidth;
//8
if (roomStartX > addRoomX)
addRooms = false;
//9
if (roomEndX < removeRoomX)
roomsToRemove.Add(room);
//10
farhtestRoomEndX = Mathf.Max(farhtestRoomEndX, roomEndX);
}
//11
foreach(var room in roomsToRemove)
{
currentRooms.Remove(room);
Destroy(room);
}
//12
if (addRooms)
AddRoom(farhtestRoomEndX);
}
}
I think my problem is with the functionForeach when i destroy room but i’m not sure.