跟随玩家

using UnityEngine;
using System.Collections;

public class EnemyAI : MonoBehaviour 
{
    public int moveSpeed = 1;//怪物移动速度
    public int rotationSpeed = 5;//怪物转身数独
    
    private Transform target;//目标玩家
    private Transform myTransform;//目标怪物
    private Vector3 targetPosition;//目标玩家的坐标
    private float maxDistance;//玩家跟怪物间的距离
    
    void Awake()
    {
        myTransform = transform;//当前怪物的transform付给myTransform
    }
    
    void Start () 
    {
        GameObject player = GameObject.FindGameObjectWithTag ("Player");//找到tag为player的对象
        target = player.transform;//定义player就是目标玩家
    }
    
    void Update () 
    {
        Debug.DrawLine (target.position, myTransform.position, Color.red);//在玩家跟怪物中间画一条直的红线方便查看
        
        //设置怪物转身,正面始终朝向玩家
        targetPosition = new Vector3 (target.position.x, 0, target.position.z);//得到怪物脚下xz坐标
        myTransform.rotation = Quaternion.Slerp (myTransform.rotation, Quaternion.LookRotation(targetPosition - myTransform.position), rotationSpeed * Time.deltaTime);//挂物转身朝向玩家
        
        //设置怪物想玩家移动
        maxDistance = Vector3.Distance(targetPosition, myTransform.position);//获取玩家与怪物之间的距离
        if(maxDistance >= 2)
        {
            //当距离大于两米时移动
            myTransform.position += myTransform.forward * moveSpeed * Time.deltaTime;//让怪物朝着自己的正面移动
        }
        else
        {
            //当距离小于两米时的动作
        }
    }
}