유니티 에디터 custom window 제작 샘플(EditorWindow)

using UnityEngine;
using UnityEditor;

public class SimpleRecorder : EditorWindow {
    string fileName = "FileName";

    string status = "Idle";
    string recordButton = "Record";
    bool recording = false;
    float lastFrameTime = 0.0f;
    int capturedFrame = 0;

    [MenuItem ("Example/Simple Recorder")]                       //상단 메뉴 툴바에 Example 서브 메뉴로 Simple Recorder 메뉴가 생김
    static void Init () {
        SimpleRecorder window =
            (SimpleRecorder)EditorWindow.GetWindow(typeof(SimpleRecorder));
    }

    void OnGUI () {
        fileName = EditorGUILayout.TextField ("File Name:", fileName);//File Name 레벨 과 파일명 얻어옴

        if(GUILayout.Button(recordButton)) {                           //Record 버튼 생성 및 이벤트 가져옴
            if(recording) { //recording
                status = "Idle...";
                recordButton = "Record";
                recording = false;
            } else { // idle
                capturedFrame = 0;
                recordButton = "Stop";
                recording = true;
            }
        }
        EditorGUILayout.LabelField ("Status: ", status);             //Status: 라벨 추가
    }

    void Update () {
        if (recording) {
            if (EditorApplication.isPlaying && !EditorApplication.isPaused){
                RecordImages();
                Repaint();                                          //에디터 custom window 에 변경 사항이 생길경우 다시 그려주는 작업
            } else
                status = "Waiting for Editor to Play";
        }
    }

    void RecordImages() {
        if(lastFrameTime < Time.time + (1/24f)) { // 24fps
            status = "Captured frame " + capturedFrame;
            Application.CaptureScreenshot(fileName + " " + capturedFrame + ".png");        //현재 실행화면 캡쳐
            capturedFrame++;
            lastFrameTime = Time.time;
        }
    }
}

https://docs.unity3d.com/ScriptReference/EditorWindow.OnGUI.html