Spawn Controller

using UnityEngine;
using System.Collections;

public class preFab : MonoBehaviour {

    public GameObject barreiraPrefab;
    public float rateSpawn;
    public float currentTime;


    // Use this for initialization
    void Start () {
        currentTime = 0;
    }

    // Update is called once per frame
    void Update () {
        currentTime += Time.deltaTime;
        if (currentTime >= rateSpawn)
        {
            currentTime = 0;
            GameObject tempPrefab = Instantiate(barreiraPrefab) as GameObject;
            tempPrefab.transform.position = new Vector3(transform.position.x, tempPrefab.transform.position.y, tempPrefab.transform.position.z);
        }
    }
}