c#脚本

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

public class PoleMove : MonoBehaviour
{
    //移动上限制
    public float up;
    //移动下限
    public float below;
    //速度
    private float speed;
    // Start is called before the first frame update
    void Start()
    {
        speed = Random.Range(0.5f, 2.5f);
    }

    // Update is called once per frame
    void Update()
    {
        if (transform.position.y>up)
        {
            speed = -speed;
        }
        if (transform.position.y < below)
        {
            speed = -speed;
        }
        //让柱子上限移动
        transform.position = new Vector3(transform.position.x, transform.position.y + speed * Time.deltaTime, transform.position.z);
    }
}

创建空的图层，并把柱子拖拽到同个图层下

给pole拖拽添加脚本