[Unity] プレイヤーの周りを周回するオブジェクトでカメラの真ん中に来たらを判定する方法が知りたい。

Question

提示コードのコメント部内部のコードなのですが提示画像のように武器がプレイヤーの周りを周回する処理で武器がカメラの真ん中に来たら消えるという処理を実装したいのですが"武器がカメラの真ん中に来たら"を判定するにはどうしたらいいのでしょうか？

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




//攻撃管理
public class Player_Attack_Control : MonoBehaviour
{

    [SerializeField, Range(3, 10)] private float instancePositionDistance;      //武器が生成される距離
    [SerializeField, Range(3, 100)] private int objectPoolInstance;             //オブジェクトプールの数
    [SerializeField, Range(0.0f, 3.0f)] private float intervalTime;             //攻撃間隔
    [SerializeField] private List<GameObject> weaponList;                       //武器リスト


    private List<List<GameObject>> instanceWeapon;  //オブジェクト
    private float time;                             //時間
    private int listNumber;                         //選択中の武器
    private GameObject weaponInstancePosition;      //武器の生成場所
    private Vector3 forward;                        //前方向
    private bool isInstance;                        //生成するかどうか？
    private GameObject nowInstance;                 //現在選択している武器
    private bool isChangeWeapon;                    //武器切替
    private List<GameObject> weapon;                //武器切替オブジェクト
    private Vector3 range;


    private List<float> angle;
    private float rotateSpeed = 50f;
    private Vector3 rotateDistance;


    public void Start()
    {
        rotateDistance = new Vector3(3,3,3);
        time = 0;
        isInstance = true;
        weapon = new List<GameObject>();
        angle = new List<float>();


        weaponInstancePosition = transform.Find("WeaponInstancePosition").gameObject;
        instanceWeapon = new List<List<GameObject>>();

        
        foreach (GameObject g in weaponList)
        {
            instanceWeapon.Add(new List<GameObject>());

            for (int i = 0; i < objectPoolInstance; i++)
            {
                instanceWeapon.Last().Add(Instantiate(g, weaponInstancePosition.transform.position, weaponInstancePosition.transform.rotation));
                instanceWeapon.Last().Last().SetActive(false);

            }
        }

        float r = 0;
        for (int i = 0; i < weaponList.Count(); i++)
        {
            weapon.Add(CreateObject(i, weaponInstancePosition.transform.position, weaponInstancePosition.transform.rotation));
            angle.Add(r);
            r += 20;
        }

        listNumber = 0;
    }


    public void Update()
    {
        Attack();           //攻撃
        Select();           //選択
        SelectAnimaton();   //アニメーション
    }



    //攻撃
    public void Attack()
    {
        Vector3 f = forward;
        f.y = 0.20f;

        weaponInstancePosition.transform.position = transform.position + f * instancePositionDistance;

        if (nowInstance != null)
        {
            nowInstance.transform.position = weaponInstancePosition.transform.position;
            nowInstance.transform.rotation = Quaternion.LookRotation(f) * Quaternion.Euler(90, 0, 0);
        }

        if (Input.GetMouseButtonDown(0))
        {
            if ((time >= intervalTime) && (isInstance == false))
            {
                nowInstance.transform.rotation = Quaternion.LookRotation(f) * Quaternion.Euler(90, 0, 0);
                nowInstance.GetComponent<Bullet>().Active(f);
                isInstance = true;
                time = 0;
            }
        }


    }
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    //武器選択アニメーション
    public void SelectAnimaton()
    {
        if (isChangeWeapon == true)
        {


            for (int i = 0; i < weaponList.Count(); i++)
            {
                weapon[i].gameObject.SetActive(true);
                weapon[i].gameObject.GetComponent<Bullet>().ChangeViewMaterial();
                weapon[i].gameObject.transform.position = transform.position + Quaternion.Euler(0f, angle[i], 0f) * rotateDistance;
                angle[i] += rotateSpeed * Time.deltaTime;

                if (angle[i] > 360)
                {
                    angle[i] = 0;
                }



            }
        }
    }
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    //武器選択
    public void Select()
    {
        if (Input.GetKeyDown(KeyCode.Q))
        {
            if (listNumber > 0)
            {
                isChangeWeapon = true;

                nowInstance.gameObject.SetActive(false);
                listNumber--;
                nowInstance = CreateObject(listNumber, weaponInstancePosition.transform.position, weaponInstancePosition.transform.rotation);
                nowInstance.gameObject.GetComponent<Bullet>().SetActiveInstanceEffect(intervalTime);
            }
        }
        else if (Input.GetKeyDown(KeyCode.E))
        {
            if (listNumber < weaponList.Count - 1)
            {
                isChangeWeapon = true;

                nowInstance.gameObject.SetActive(false);
                listNumber++;
                nowInstance = CreateObject(listNumber, weaponInstancePosition.transform.position, weaponInstancePosition.transform.rotation);
                nowInstance.gameObject.GetComponent<Bullet>().SetActiveInstanceEffect(intervalTime);
            }
        }

        if (isInstance == true)
        {
            nowInstance = CreateObject(listNumber, weaponInstancePosition.transform.position, weaponInstancePosition.transform.rotation);
            nowInstance.gameObject.GetComponent<Bullet>().SetActiveInstanceEffect(intervalTime);
            isInstance = false;
        }
    }

    public void FixedUpdate()
    {
        Vector3 f = Vector3.Scale(Camera.main.transform.forward.normalized, new Vector3(1, 0, 1)).normalized;
        forward = (f + Camera.main.transform.forward).normalized;

        time += Time.deltaTime;
    }


    //オブジェクトプール　オブジェクト生成
    GameObject CreateObject(int select, Vector3 pos, Quaternion rot)
    {
        foreach (GameObject gg in instanceWeapon[select])
        {
            if (gg.activeSelf == false)
            {
                gg.SetActive(true);
                gg.gameObject.GetComponent<Bullet>().Init();


                gg.transform.position = pos;
                gg.transform.rotation = rot;

                return gg;
            }
        }

        instanceWeapon[select].Add(Instantiate(weaponList[select]));
        instanceWeapon[select].Last().SetActive(true);
        instanceWeapon[select].Last().transform.position = pos;
        instanceWeapon[select].Last().transform.rotation = rot;
        instanceWeapon.Last().Last().gameObject.GetComponent<Bullet>().Init();

        return instanceWeapon.Last().Last().gameObject;
    }
}