gamemanagel.cs

using UnityEngine;

using System.Collections;

public class GameManagel : MonoBehaviour {

public GameObject Monster;

public GameObject Zombie;

public Transform[] point;      //it makes me use other GameObjects. Declare array...

public float CreateTime = 2.0f;

// Use this for initialization

void Start () {

point = GameObject.Find ("SpawnPoint").GetComponentsInChildren<Transform>();     //access SpawnPoint and its childrens

}

// Update is called once per frame

void Update () {

if(Time.time > CreateTime)

{

if(GameObject.FindGameObjectsWithTag("Monster").Length + GameObject.FindGameObjectsWithTag("Zombie").Length <=5)

{

CreateMonster();

CreateTime = Time.time + 2.0f;

}

}

}// end of Update().

void CreateMonster()

{

int idx = Random.Range(1,point.Length);

Instantiate(Monster,point[idx].position,Quaternion.identity);

Instantiate(Zombie,point[idx].position,Quaternion.identity);

}  //end of CreateMonster().

}