下面，我們?yōu)橛螒蚣右稽c(diǎn)變數(shù)——天氣
最初的設(shè)想為晴天時(shí)轮听，火焰·炮彈防御塔正常運(yùn)行骗露，弩箭·激光武器威力加1/2，冰塔減速效果削弱血巍；雨天時(shí)萧锉，火焰·炮彈傷害減半，減速效果提升述寡，雪天火焰·炮彈傷害減3/4柿隙，除減速的冰塔，其余防御塔攻速減半鲫凶。

然后我們下載一個(gè)雨雪的插件禀崖，或者自己寫(xiě)也行。
unity3d 游戲插件 移動(dòng)平臺(tái)天氣系統(tǒng) UniStorm Mobile
鏈接: http://pan.baidu.com/s/1sjIEY41
密碼: n23b

unity3d 游戲插件 天氣 氣候 模擬 Nuaj' v1.2 天氣制作系統(tǒng)
鏈接: http://pan.baidu.com/s/1pJvIyKz
密碼: r289

unity3d 游戲插件 Storm Effects 天氣特效支持IOS
鏈接: http://pan.baidu.com/s/1qW00hqc
密碼: p6qn

我使用的是第三個(gè)螟炫。
那么開(kāi)始動(dòng)手吧波附！
首先創(chuàng)建一個(gè)空物體，并放在在合適的位置昼钻，并創(chuàng)建WeatherController腳本控制天氣轉(zhuǎn)變掸屡，代碼如下：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class WeatherController : MonoBehaviour 
{
    private GameObject Wea;
    public int weather = 0;
    GameObject o = null;
    private int oldweather;
    void Awake()
    {
        Wea = (GameObject)Resources.Load("Weather/Clouds Light");
        
    }
    public void Change()
    {
        if (weather == 0)
        {
            Wea = (GameObject)Resources.Load("Weather/Clouds Light");
        }
        else if (weather == 1)
        {
            Wea = (GameObject)Resources.Load("Weather/Rain Mobile Heavy");
        }
        else if (weather == 2)
        {
            Wea = (GameObject)Resources.Load("Weather/Snow Medium Happy");
        }
        if (transform.GetChildCount() == 0)
        {
            o = Instantiate(Wea, transform.position , Wea.transform.rotation) as GameObject;
            o.transform.parent = transform;
            oldweather = weather;
        }
        else if (transform.GetChildCount() > 0 && weather != oldweather)
        {
            Destroy(transform.GetChild(0).gameObject);
            o = Instantiate(Wea, transform.position , Wea.transform.rotation) as GameObject;
            o.transform.parent = transform;
            oldweather = weather;
        }
    }   
}

我暫時(shí)打算分波次改變天氣（隨機(jī)也行，固定也可然评，隨你喜歡）折晦，weather記錄當(dāng)前天氣編號(hào)，oldweather記錄上一次天氣編號(hào)沾瓦，如果前后不同才更新满着，否則不變（減少實(shí)例化和銷(xiāo)毀次數(shù)）谦炒，然后在EnemyCreatePos 腳本的Test02協(xié)程中，隨機(jī)weather值风喇，達(dá)到改變天氣從而改變防御塔的作用（防止玩家過(guò)分依賴(lài)某一種防御塔）宁改。

然后更改CheckEnemy腳本：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CheckEnemy : MonoBehaviour 
{
    private WeatherController wc;
    /// <summary>
    /// 是否能打到飛行怪
    /// </summary>
    public bool IsHitFly;
    /// <summary>
    /// 開(kāi)火頻率
    /// </summary>
    public float firewaittime = 2;
    private float fw;
    private float dv;
    /// <summary>
    /// 炮塔價(jià)格
    /// </summary>
    public float value = 100;
    /// <summary>
    /// 臨時(shí)ID，測(cè)試
    /// </summary>
    public int idi = 0;
    /// <summary>
    /// 是否是特效炮塔魂莫，比如激光还蹲，火焰槍
    /// </summary>
    public bool IsEffectTow;
    /// <summary>
    /// 炮塔轉(zhuǎn)動(dòng)速度
    /// </summary>
    public float turnSpeed = 10;
    /// <summary>
    /// 最遠(yuǎn)攻擊距離
    /// </summary>
    public float disFire = 12;
    /// <summary>
    /// 是否有正在攻擊的目標(biāo)
    /// </summary>  
    private bool isAlarm;
    /// <summary>
    /// 子彈
    /// </summary>
    public GameObject ziDan;
    /// <summary>
    /// 子彈生成位置
    /// </summary>
    public Transform firePos;
    /// <summary>
    /// 攻擊目標(biāo)
    /// </summary>
    private Transform targetEnemy;
    /// <summary>
    /// 存儲(chǔ)所有檢測(cè)到的敵人
    /// </summary>
    private List<Transform> enemyList;
    /// <summary>
    /// 開(kāi)火的協(xié)程是否開(kāi)啟
    /// </summary>
    private bool isFire = false;
    void Start () 
    {
        fw = firewaittime;
        wc = GameObject.Find("Weather").GetComponent<WeatherController>();
        enemyList = new List<Transform>();
        //if (ziDan.name == "ZhaDan" || ziDan.name == "FireIce")
        //{
        //    IsHitFly = false;
        //}
        //else {
        //    IsHitFly = true;
        //}
        //如果是特效炮塔，關(guān)閉特效
        if (IsEffectTow) {
            if (transform.GetComponentInChildren<ParticleSystem>() != null) {
                transform.GetComponentInChildren<ParticleSystem>().Stop();
            }
        }
    }
    
    void Update () {
        //攻擊隊(duì)列里有敵人
        if (enemyList.Count != 0)
        {
            if (enemyList[0] == null) 
            {
                if (enemyList.Count != 1)
                {
                    enemyList[0] = enemyList[1];
                    enemyList.Remove(enemyList[1]);
                }
                else {
                    enemyList = new List<Transform>();
                }
            }     
            else 
            {
                if (!isFire)
                {
                    isFire = true;
                    StartCoroutine("Fire");
                }
                //瞄準(zhǔn)敵人
                //transform.LookAt(enemyList[0]);
                if (transform.name != "HighTower") 
                {
                    Vector3 direction = enemyList[0].position - transform.GetChild(0).GetChild(0).position + new Vector3(0, 1.2f, 0);
                    Quaternion qua = Quaternion.LookRotation(direction);
                    transform.GetChild(0).GetChild(0).rotation = Quaternion.Lerp(transform.GetChild(0).GetChild(0).rotation, qua, Time.deltaTime * turnSpeed);
                }
                
                ////如果敵人脫離攻擊范圍耙考，或者死亡                   
                if (enemyList[0].GetComponent<EnemyContrl>().Blood <= 0)
                {
                    enemyList.Remove(enemyList[0]);
                }
            }         
        }
        else {
            if (isFire) 
            {
                StopCoroutine("Fire");
                if (IsEffectTow) {
                    transform.GetComponentInChildren<ParticleSystem>().Stop();
                }            
                isFire = false;
                enemyList = new List<Transform>();
            }
        }
    }
    /// <summary>
    /// 檢測(cè)觸發(fā)物是否為敵人,是的話(huà)放入攻擊列表
    /// </summary>
    void OnTriggerEnter(Collider other) 
    {
        if (IsHitFly)
        {
            if (other.transform.tag == "Enemy" || other.transform.tag == "FlyEnemy")
            {
                if (!enemyList.Contains(other.transform))
                {
                    enemyList.Add(other.transform);
                }
            }
        }
        else 
        {
            if (other.transform.tag == "Enemy")
            {
                if (!enemyList.Contains(other.transform))
                {
                    enemyList.Add(other.transform);
                }
            }
        }       
    }
    void OnTriggerExit(Collider other)
    {
        if (other.transform.tag == "Enemy" || other.transform.tag == "FlyEnemy")
        {
            if (enemyList.Contains(other.transform))
            {
                enemyList.Remove(other.transform);
            }
        }
    }

    /// <summary>
    /// 炮塔射擊敵人
    /// </summary>
    IEnumerator Fire() {
        //播放特效
        if (IsEffectTow) {
            transform.GetComponentInChildren<ParticleSystem>().Play();
        }
        GameObject go = null;
        while (true) 
        {
            yield return new WaitForSeconds(firewaittime);
            if (enemyList.Count != 0 && enemyList[0] != null)
            {
                //生成子彈并指定發(fā)射的目標(biāo)
                 go = Instantiate<GameObject>(ziDan, firePos.transform.position, firePos.transform.rotation);                 
                if (transform.tag == "Pao")
                {
                    dv = go.GetComponent<ZhaDan>().damageValue;
                    go.GetComponent<ZhaDan>().target = enemyList[0];
                }
                else if(transform.tag == "NoPao")
                {
                    go.GetComponent<Bullet>().target = enemyList[0];
                }
                if (go.tag == "Bomb")
                {
                    go.GetComponent<ZhaDan>().damageValue = dv;
                    firewaittime = fw;
                    if (wc.weather == 1)
                    {
                        go.GetComponent<ZhaDan>().damageValue = dv * 0.75f;
                        firewaittime = fw * 0.75f;
                    }
                    else if (wc.weather == 0)
                    {
                        go.GetComponent<ZhaDan>().damageValue = dv * 1.25f;
                    }
                }
                else if (go.tag == "Ice")
                {
                    firewaittime = fw;
                    if (wc.weather == 1)
                    {
                        go.GetComponent<ZhaDan>().damageValue = dv * 1.25f;
                    }
                    else if (wc.weather == 2)
                    {
                        firewaittime = fw * 1.25f;
                    }
                    else
                    {
                        go.GetComponent<ZhaDan>().damageValue = dv * 0.75f;
                        firewaittime = fw * 0.75f;
                    }
                }
                else if (go.tag == "Untagged")
                {
                    firewaittime = fw;
                    if (wc.weather == 0)
                    {
                        firewaittime = fw * 1.25f;
                    }
                    else if (wc.weather == 1)
                    {
                        firewaittime = fw * 1.25f;
                    }
                }
            }
            else if (enemyList.Count != 0 && enemyList[0] == null) 
            {
                if (IsEffectTow)
                {
                    transform.GetComponentInChildren<ParticleSystem>().Stop();
                }
                enemyList.Remove(enemyList[0]);
                Destroy(go);
            }
                   
        }      
    }
}