Skip to content

Instantly share code, notes, and snippets.

Last active May 10, 2023 07:44
  • Star 33 You must be signed in to star a gist
  • Fork 4 You must be signed in to fork a gist
Star You must be signed in to star a gist
Save ulrikdamm/338392c3b0900de225ec6dd10864cab4 to your computer and use it in GitHub Desktop.
Unity editor script for better editing of prefabs. Put in Assets/Editor.
using UnityEngine;
using UnityEditor;
using UnityEditor.SceneManagement;
// Adds a "Edit Prefab" option in the Assets menu (or right clicking an asset in the project browser).
// This opens an empty scene with your prefab where you can edit it.
// Put this script in your project as Assets/Editor/EditPrefab.cs
public class EditPrefab {
static Object getPrefab(Object selection) {
var prefabType = PrefabUtility.GetPrefabType(selection);
if (prefabType == PrefabType.PrefabInstance) {
var prefab = PrefabUtility.GetPrefabParent(selection);
return prefab;
if (prefabType == PrefabType.Prefab) {
return selection;
return null;
[MenuItem("Assets/Edit prefab")]
public static void editPrefab() {
var currentScene = EditorSceneManager.GetActiveScene().path;
var prefab = getPrefab(Selection.activeObject);
if (prefab == null) { Debug.Log("Couldn't find prefab"); return; }
var scene = EditorSceneManager.NewScene(NewSceneSetup.DefaultGameObjects, NewSceneMode.Single);
var instance = (GameObject)PrefabUtility.InstantiatePrefab(prefab, scene);
Selection.activeObject = instance;
var returnButton = new ReturnToSceneGUI();
returnButton.previousScene = currentScene;
returnButton.prefabInstance = instance;
public sealed class ReturnToSceneGUI {
public string previousScene;
public GameObject prefabInstance;
public ReturnToSceneGUI() {
SceneView.onSceneGUIDelegate += RenderSceneGUI;
public void RenderSceneGUI(SceneView sceneview) {
var style = new GUIStyle();
style.margin = new RectOffset(10, 10, 10, 10);
GUILayout.BeginArea(new Rect(20, 20, 180, 300), style);
var rect = EditorGUILayout.BeginVertical();
GUI.Box(rect, GUIContent.none);
if (GUILayout.Button("Apply and return", new GUILayoutOption[0])) {
PrefabUtility.ReplacePrefab(prefabInstance, PrefabUtility.GetPrefabParent(prefabInstance), ReplacePrefabOptions.ConnectToPrefab);
SceneView.onSceneGUIDelegate -= RenderSceneGUI;
if (GUILayout.Button("Discard changes", new GUILayoutOption[0])) {
SceneView.onSceneGUIDelegate -= RenderSceneGUI;
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment