CubeField

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.InputSystem;

[RequireComponent(typeof(BoxCollider))]

public class CubeField : MonoBehaviour
{
    [SerializeField] private LayerMask _fieldMask;

    private BoxCollider _fieldCollider;
    private bool _isEnterField = false;


    public UnityAction EnterFieldEvent;
    public UnityAction ExitFieldEvent;

    private void Awake()
    {
        _fieldCollider = GetComponent<BoxCollider>();
    }

    private void FixedUpdate()
    {
        if (TryGetHitInField(Mouse.current.position.ReadValue(), Camera.main))
        {
            if (_isEnterField == false)
            {
                _isEnterField = true;

                EnterFieldEvent?.Invoke();
            }
        }
        else
        {
            if (_isEnterField)
            {
                _isEnterField = false;

                ExitFieldEvent?.Invoke();
            }
        }
    }

    private bool TryGetHitInField(Vector3 screenPosition, Camera camera)
    {
        Ray ray = camera.ScreenPointToRay(screenPosition);

        if (Physics.Raycast(ray, float.MaxValue, _fieldMask))
            return true;
        else
            return false;
    }
}