Unity custom editor for parametric objects

ParametricObjectEditor.cs

// This script is the common part of the set up to use parametric objects in Unity:
// Watch the video-tutorial with explanation here:
// https://youtu.be/KCDYdQUufhs

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

[CustomEditor(typeof(Room))]
public class RoomEditor : Editor
{
    public override void OnInspectorGUI()
    {
        var room = (Room)target;

        EditorGUI.BeginChangeCheck();

        base.OnInspectorGUI();

        if (EditorGUI.EndChangeCheck() || GUILayout.Button("Recreate"))
        {
            room.Recreate();
        }
    }
}