Unity实现物体缓慢转向目标

using UnityEngine;
using System.Collections;
 
public class test : MonoBehaviour
{
    public float angleSpeed = 0.01f;
    public Transform target;
    public bool isRotate = true;
 
    void Update()
    {
        Vector3 vec = (target.position - transform.position);
        Quaternion rotate = Quaternion.LookRotation(vec);
        if (Vector3.Angle(vec, transform.forward)