Merge pull request #328 from epiplon-game-studio/master

Fixes a reference error bug with play mode

Author: LogicalError

RealtimeCSG/Assets/Plugins/RealtimeCSG/Editor/Scripts/Control/Managers/InternalCSGModelManager.DefaultModel.cs

@@ -88,7 +88,13 @@ static void InitializeDefaultCSGModel(Scene currentScene, CSGSceneState sceneSta
 			bool inPrefabMode = false;
 			Transform prefabRootTransform = null;
 #if UNITY_2018_3_OR_NEWER
+
+#if UNITY_2021_2_OR_NEWER
+			var currentPrefabStage = UnityEditor.SceneManagement.PrefabStageUtility.GetCurrentPrefabStage();
+#else
 			var currentPrefabStage = UnityEditor.Experimental.SceneManagement.PrefabStageUtility.GetCurrentPrefabStage();
+#endif
+
 			if (currentPrefabStage != null)
 			{
 				var prefabRoot = currentPrefabStage.prefabContentsRoot;