Tự động tạo Zombie trong game Zombie Hunter với Unity3D

using UnityEngine;
using System.Collections;

public class RotateGun : MonoBehaviour {
    public Vector3 target;
	// Use this for initialization
	void Start () {
	
	}
	
	// Update is called once per frame
	void Update () {

        LookAtCursor();
	}

    void LookAtCursor()
    {
        Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        RaycastHit hit;

        if (Physics.Raycast(ray, out hit))
        {
            target = hit.point;
        }

        transform.LookAt(target);
    }
}
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using UnityEngine;
using System.Collections;

public class MoveToPlayer : MonoBehaviour {

    float moveSpeed;
    public float minMoveSpeed = 0.05f;
    public float maxMoveSpeed = 0.3f;
    GameObject player;
    GameObject lookAtTarget;
	// Use this for initialization
	void Start () {
        player = GameObject.FindGameObjectWithTag("Player");
        lookAtTarget = GameObject.FindGameObjectWithTag("LookTarget");
        UpdateMoveSpeed();
	}

    void UpdateMoveSpeed()
    {
        moveSpeed = Random.Range(minMoveSpeed, maxMoveSpeed);
    }
	
    void Move()
    {
        if (player == null || lookAtTarget == null)
            return;
        transform.LookAt(lookAtTarget.transform.position);
        transform.position = Vector3.Lerp(transform.position, player.transform.position, moveSpeed * Time.deltaTime);
    }

	// Update is called once per frame
	void Update () {
        Move();
	}
}
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using UnityEngine;
using System.Collections;

public class SpawnEnemy : MonoBehaviour {

    GameObject[] spawnPoint;
    public GameObject zombie;
    public float minSpawnTime = 0.2f;
    public float maxSpawnTime = 1;
    private float lastSpawnTime = 0;
    private float spawnTime = 0;
	// Use this for initialization
	void Start () {
        spawnPoint = GameObject.FindGameObjectsWithTag("Respawn");
        UpdateSpawnTime();
	}

    void UpdateSpawnTime()
    {
        lastSpawnTime = Time.time;
        spawnTime = Random.Range(minSpawnTime, maxSpawnTime);
    }

    void Spawn()
    {
        int point = Random.Range(0, spawnPoint.Length);
        Instantiate(zombie, spawnPoint[point].transform.position, Quaternion.identity);
        UpdateSpawnTime();
    }
	
	// Update is called once per frame
	void Update () {
	    if (Time.time >= lastSpawnTime + spawnTime)
        {
            Spawn();
        }
	}
}
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