바구니 선택하면 선택한 바구니만 남고 , 게임시작 누르면 씬 전환

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

public class BasketsController : MonoBehaviour
{
    [SerializeField]
    private List<GameObject> baskets;

    [SerializeField]
    private Button btnStartGame;
    public GameObject buttonGo;
    // Start is called before the first frame update
    void Start()
    {
        this.btnStartGame.onClick.AddListener(() =>
        {
            SceneManager.LoadScene("GameScene");
        });
        buttonGo = GameObject.Find("Button");
        buttonGo.SetActive(false);
    }

    // Update is called once per frame
    void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            float maxDistance = 10f;
            Debug.DrawRay(ray.origin, ray.direction * maxDistance, Color.green, 1f);
            RaycastHit hit;

            if (Physics.Raycast(ray, out hit, maxDistance))
            {
               
                
                GameObject foundBasketGo = this.baskets.Find(x => x == hit.collider.gameObject);
                
                buttonGo.SetActive(true);
                //int index = -1;
                //for(int i = 0; i < this.baskets.Count; i++)
                //{
                //    if (foundBasketGo == this.baskets[i])
                //    {
                //        index = i;
                //        break;
                //    }
                //}

                int selectedBasketType = this.baskets.IndexOf(foundBasketGo); //찾아주는 메서드
                InfoManager.instance.selectedBasketType = selectedBasketType;

                foreach(var go in this.baskets)
                {
                    if (go != foundBasketGo)
                    {
                        go.SetActive(false);// 비활성화
                    }
                }
            }
        }
    }
    
}

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

public class InfoManager
{
    //싱글톤
    public static readonly InfoManager instance = new InfoManager();

    public int selectedBasketType = -1;
    private InfoManager()
    {

    }
}

using Palmmedia.ReportGenerator.Core.Reporting.Builders;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
public class GameDirector : MonoBehaviour
{
    [SerializeField]
    private Text txtTime;
    [SerializeField]
    private Text txtScore;

    private float time = 60.0f;
    private int score = 0;
    // Start is called before the first frame update
    void Start()
    {
        this.UpdateScoreUI();
    }

    // Update is called once per frame
    void Update()

    {
        this.time -= Time.deltaTime;
        this.txtTime.text = this.time.ToString("F1");//소수점 1자리까지 표시
    }
    public void UpdateScoreUI()
    {
        this.txtScore.text = string.Format("{0} Point", score);
    }
    public void IncreaseScore(int score)
    {
        this.score += score;
        this.UpdateScoreUI();
    }
    public void DecreaseScore(int score)
    {
        this.score -= score;
        this.UpdateScoreUI();
    }
}

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

public class ItemGenerator : MonoBehaviour
{
    private float elasedTime;//경과시간
    private float spawnTime = 1f; //1초에 한번씩
    public GameObject applePrefab;
    public GameObject bombPrefab;
    // Start is called before the first frame update
    void Start()
    {
        
    }

    // Update is called once per frame
    void Update()
    {
        //시간 재기
        //변수에 Time.deltaTime을 더해라
        this.elasedTime += Time.deltaTime;
        if (this.elasedTime >= this.spawnTime)
        {
            this.CreateItem();
            //초기화
            this.elasedTime = 0;
        }

    }
    private void CreateItem()
    {
        //사과 똫는 폭탄
        int rand=Random.Range(0, 11);// 1~10사과가 나오는 횟수를 더 늘리고싶음
        GameObject itemGo = null;
        if (rand>3)
        {
            itemGo= Instantiate<GameObject>(this.applePrefab);
        }
        else 
        {
            itemGo= Instantiate<GameObject>(this.bombPrefab);
        }
        //위치설정
        //x:-1,1
        //Z:-1,1
        int x= Random.Range(-1, 2);//-1,0,1
        int z = Random.Range(-1, 2);
        itemGo.transform.position=new Vector3(x, 3.5f, z);
    }
}

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

public class ItemController : MonoBehaviour
{
    [SerializeField]
    public float moveSpeed = 1f;
    // Start is called before the first frame update
    void Start()
    {
        
    }

    // Update is called once per frame
    void Update()
    {
        //translate는 기본이 로컬좌표로 이동이다
        this.transform.Translate(Vector3.down * moveSpeed * Time.deltaTime);//(0,-1,0)
        if (this.transform.position.y <= 0)
        {
            Destroy(this.gameObject);//Destroy(this)는 완전히 다른의미이다.
        }
    }
}

버튼을 비활성화 클릭하고 시작하니까 계속 nullreference 오류가 났음--> 해결 시작할때 setActive(false)로 하고 ray에 충돌있을 때 setActive(ture)로 하니 해결됨