(1)BGLoop

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class TestBGScrorer : MonoBehaviour
{
    public Transform[] arrGround;
    public float speed = 2f;
 
    private void Update()
    {
        for(int i = 0;  i<this.arrGround.Length;i++)
        {
            this.arrGround[i].Translate(new Vector3(0, -0.1f, 0) * this.speed);
            if(this.arrGround[i].transform.localPosition.z<=-29.5f)
            {
                this.arrGround[i].transform.localPosition = new Vector3(0, 0, 59f);
            }
        }
    }
}