(Unity)二台のカメラ(Main とSub)をボタンで切り替える

(スクリプト)

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

public class CamController : MonoBehaviour
{
    public Camera mainCam;
    public Camera subCam;

    void Start()
    {
        mainCam.enabled = true;
        subCam.enabled = false;
    }

    void Update()
    {
        if(Input.GetKeyDown(KeyCode.Space))
        {
            if(mainCam.enabled) // MainCameraがオンの時
            {
                mainCam.enabled = false;
                subCam.enabled = true;
            }
            else // MainCameraがオフの時
            {
                mainCam.enabled = true;
                subCam.enabled = false;
            }
        }
    }
}