Unity中使用A*尋路方式步驟

1、在Unity中使用A*尋路方法步驟（這里暫不對A*算法進行講解）

 （1）導入A*尋路插件（該插件需要在較高版本使用【例如2017，5.6無法使用】）—搭建場景—場景中設置兩個層級，地面（Ground）和障礙物（Obstacle）且分別為地面和障礙物設置對應的層—設置兩個標簽，地面（Ground）和障礙物（Obstacle）且分別為地面和障礙物設置對應的標簽

   （2）創建一個空物體命名為“A*”，為其添加Astar Path組件（組件庫中搜Pathfinder組件或【Components–>Pathfinding–>Pathfinder】），用於設置尋路參數

（3）在Astar Path組件的Graphs選項中選擇Grid Graph—在面板中對各種參數進行詳細設置—點擊Scan可查看場景中形成的網格

（4）為尋路物體添加Seeker腳本—創建C#腳本，編譯代碼，並掛載到尋路物體上

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Pathfinding;//需要引入Pathfinding
public class MySkker : MonoBehaviour {

    public GameObject target;  //目標物
    private Seeker seeker1;
    private Path path1;  //路徑
    private float nextwaypointDistance=1; //距離下一個點的距離
    private int currentwaypoint = 0; //當前路點
    public float speed = 100;
    public float rotspeed = 60; //旋轉速度
    // Use this for initialization

    void Start () {
        seeker1 = this.GetComponent<Seeker>();
        seeker1.pathCallback += OnpathCompeleter;
        seeker1.StartPath(transform.position,target.transform.position);
    }
    // Update is called once per frame

    void Update () {
        if (path1==null) {
            print("為空了");
            return;
        }

        if (currentwaypoint>=path1.vectorPath.Count) {
            return;
        }

        Vector3 dir = (path1.vectorPath[currentwaypoint] - transform.position).normalized;
        dir *= speed * Time.deltaTime;
        transform.Translate(dir,Space.World);
        Quaternion targetrotation = Quaternion.LookRotation(dir);
        transform.rotation = Quaternion.Slerp(transform.rotation,targetrotation,Time.deltaTime*rotspeed);

        if (Vector3.Distance(transform.position,path1.vectorPath[currentwaypoint]) < nextwaypointDistance){
            currentwaypoint++;
            return;
        }
    }

    private void OnpathCompeleter(Path p) {

        if (!p.error) {
            path1=p;
            currentwaypoint = 0;
        }
    }

}