unity---背景循环滚动

方法一：场景创建Sprite
Transform position 为0
复制第二张 Y 位置为 图片像素/ Pixel Per Unit100

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
//这里脚本挂到了管理上
public class MainManager : MonoBehaviour
{
    Transform bg1Spr, bg2Spr;
    Transform[] BgSprites;
    public float moveSpeed = 5f;
    private void Awake()
    {
        bg1Spr = transform.Find("BgGround/bg1");
        bg2Spr = transform.Find("BgGround/bg2");
    }
    void Start()
    {
        BgSprites = new Transform[] { bg1Spr, bg2Spr };
    }

    void Update()
    {
        Vector3 translate = Vector3.down * Time.deltaTime * this.moveSpeed;
        for (int i = 0; i < BgSprites.Length; i++)
        {
            BgSprites[i].Translate(translate);
            if (BgSprites[i].position.y < -19.49f)
            {
                BgSprites[i].position += new Vector3(0, 19.49f * 2, 0);
            }
        }
    }
}

方法二：利用shader

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

public class GameManager : MonoBehaviour
{
    float moveSpeed = 0.1f;
    Material material;
    private void Awake()
    {
        material = transform.Find("UIPanel/Bg/bg1").GetComponent<Image>().material;
    }
    float y;
    public float Y
    {
        get { return y; }
        set { y = value; }
    }



    void Update()
    {

        Y += Time.deltaTime * moveSpeed;
        //给shader里对应的字段赋值
        material.SetTextureOffset("_MainTex", new Vector2(0, Y));
        // material.mainTextureOffset = new Vector2(0, Y);


    }
}

http://www.ceeger.com/Script/Material/Material.SetTextureOffset.html#

参考：https://fengyu.name/article/311