Unity 2D - How to place obstacle in Running game? - unity3d

Question

I finish making running game. But I placed obstacle like this :
This way makes phone frozen often. So I make a prefeb is made of obstacle object like this :
I want to use function SetActive(bool) to appear/disappear obstacle. Finally, How it works is My runner is at a standstill and background, obstacle, coin, juwel is moved. But My creator script has a big problem.
My Prolem :
As you see, This code create blank(red box) between two obstacle prefebs. I can't find problem. Plz help me...
Creator Script :
using UnityEngine;
using System.Collections;
public class CsPartCreator : MonoBehaviour {
int count = 1;
float timer = 0.0f;
// Use this for initialization
void Start () {
for (int i = 1; i < 26; i++)//set Deactive all object excluding first object (Because This object is watched at first.)
transform.GetChild(i).gameObject.SetActive(false);
}
// Update is called once per frame
void Update () {
timer += Time.deltaTime;
if (timer > 5f && count < 23)//every 5 seconds and count is smaller than the number of prefeb
{
transform.GetChild(count).gameObject.SetActive(true);//
count++;
timer = 0;
}
}
}
This is my Hierarchy :

Answer 1

I think , That missing prefab's Z value is more negative than background , Or you have used a sorting layer which is set to be behind background.
And Check if all obstacle gameobjects correctly orderered in Hirachy Part0, Part1, Part2, Part3 like that. Let me know if those are in correct order
Please check that :)
using UnityEngine;
using System.Collections;
using System.Linq;
using System.Collections.Generic;
public class CsPartCreator : MonoBehaviour
{
private GameObject player;
float timer = 0.0f;
private List<GameObject> obstacles;
void Awake()
{
player = GameObject.FindWithTag("Player");
obstacles = new List<GameObject>();
}
// Use this for initialization
void Start()
{
for (int i = 0; i < 26; i++)//set Deactive all object excluding first object (Because This object is watched at first.)
{
obstacles.Add(transform.GetChild(i).gameObject);
transform.GetChild(i).gameObject.SetActive(false);
}
}
// Update is called once per frame
void Update()
{
if (obstacles == null || obstacles.Count() == 0)
return;
var toActivate = obstacles.Where(x => x.transform.position.x > transform.position.x && x.transform.position.x < transform.position.x + 10).ToList(); // +10 is the range
foreach (GameObject go in toActivate)
{
go.SetActive(true);
obstacles.Remove(go);
}
}
}
Set player gameobject to "Player" tag as in image below