3d模式下 让敌人拥有自动移动的AI

using UnityEngine;
using System.Collections;

public class troll : MonoBehaviour
{

    private bool isIdel=true;
    public float timer = 2;
    public int speed = 1;
   // private Rigidbody rigidbody;
    private Animator anim;
    private CharacterController controller;
    private float angle = 0;//旋转的角度

    void Start ()
    {
       // rigidbody = this.GetComponent<Rigidbody>();
        anim = this.GetComponent<Animator>();
        controller = GetComponent<CharacterController>();
    }
    
    // Update is called once per frame
    void Update ()
    {
        timer -= Time.deltaTime;
        if (timer<=0)
        {
            if (isIdel)
            {
                //行走方法
                TransformToWalk();
            }
            else
            {

                //进行站立状态
                TransformToIdel();
            }
        }
        if (!isIdel)
        {
            
               
           TransformToRotate();
            //进行位移
            //transform.position += transform.forward*Time.deltaTime*speed;
           Move();
        }

    }

    public void Move()  
    {
        controller.SimpleMove(transform.forward * speed);
    }

    public void TransformToRotate()//平滑旋转的方法
    {
        float temp = angle * 0.05f;//旋转的角度乘以20分之1帧
        transform.Rotate(new Vector3(0, temp, 0));
        angle -= temp;//总的旋转角度减去已旋转的角度  
    }

    public void TransformToIdel()
    {
        timer = 2f;
        isIdel = true;
        AnimationToIdel();
    }

    public void TransformToWalk()
    {
        isIdel = false;
        timer = 5f;
        angle = Random.Range(-90, 90);
        
        AnimationToWalk();
    }

    public void AnimationToWalk()
    {
        anim.SetFloat("walk",1.0f);
        anim.SetFloat("idle",0f);
        anim.SetFloat("run",0f);
    }

    public void AnimationToIdel()
    {
        anim.SetFloat("walk", 0f);
        anim.SetFloat("idle", 1.0f);
        anim.SetFloat("run", 0f);
    }
}