为实现游戏背景重复使用，并跟随摄像机移动，采用以下脚本。

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

public class OwnFloorControl : MonoBehaviour
{
    //摄像机
    private GameObject main_camera = null;
    //初始位置
    private Vector3 initial_position;
    //背景组件宽度（X轴方向）
    public const float WIDTH = 10.0f * 4.0f;
    //背景组件个数
    public const int MODEL_NUM = 3;

    // Use this for initialization
    void Start()
    {
        //组件应该附在背景上？
        //主角武士上？
        //cs是单个背景的component,背景根据主摄像头移动，主摄像头跟随主角移动

        this.main_camera = GameObject.FindGameObjectWithTag("MainCamera");
        this.initial_position = this.transform.position;
    }

    // Update is called once per frame
    void Update()
    {
        //整体背景宽度 #宽度x个数
        float total_width = OwnFloorControl.WIDTH * OwnFloorControl.MODEL_NUM;
        //背景组件的位置
        Vector3 floor_position = this.transform.position;
        //摄像机的位置
        Vector3 camera_position = this.main_camera.transform.position;

        if (floor_position.x + total_width / 2.0f < camera_position.x)  
        {
            //画布中部在相机位置左
            //向前移动
            floor_position.x += total_width;
            this.transform.position = floor_position;
        }
    }
}

效果

floor.png

component.png