# Navigation 簡單用法 (設定多個地點讓NPC循環走(或是隨機走))
## 設置
> 導航系統(也就是Navigation)，會建立在Terrain上，所以要先確定地板用的是Terrain喔！
>
* Windows >AI > Navigation(下圖)

* Inspector旁邊就會出現Navigation的操作介面(?)

* 在Object可以選擇all/mesh/terrain，Hierachry會顯示可以選擇的東西，選擇之後Navigation Static要勾選起來，然後選擇Walkable/Not walkable

* 設定好後按下Bake

* 這就是可以走的部分

## 人物的設置
* 如果是NPC，可以直接掛一個walk的動畫上去(記得要開loop)

* 增加一個Component:Nav Mash Agent

* 建立一個Script : NPCAI Nav

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;    //記得要加

public class NPCATNav : MonoBehaviour
{
    public GameObject destination;
    NavMeshAgent theAgent;

    void Start()
    {
        theAgent = GetComponent<NavMeshAgent>();
    }

    void Update()
    {
        theAgent.SetDestination(destination.transform.position);
    }
}

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

public class NPCdes : MonoBehaviour
{
    public int pivopoint;
    private void OnTriggerEnter(Collider other)
    {
        if(other.tag == "NPC")
        {
            if (pivopoint == 5)
            {
                pivopoint = 0;
            }
            if (pivopoint == 4)
            {
                this.gameObject.transform.position = new Vector3(28.88f, 1.07f, -26.26f);
                pivopoint = 5;
            }
            if (pivopoint == 3)
            {
                this.gameObject.transform.position = new Vector3(35.78f, 1.07f, -34.47f);
                pivopoint = 4;
            }
            if (pivopoint == 2)
            {
                this.gameObject.transform.position = new Vector3(39.62f, 1.07f, -35.59f);
                pivopoint = 3;
            }
            if (pivopoint == 1)
            {
                this.gameObject.transform.position = new Vector3(36.54f, 1.07f, -39.59f);
                pivopoint = 2;
            }
            if(pivopoint == 0)
            {
                this.gameObject.transform.position = new Vector3(34.44f, 1.07f, -26.26f);
                pivopoint = 1;
            }


        }
    }
}