Added a way to delete camera at parent root.

Author: Stephen Hodgson

Assets/HoloToolkit/Utilities/Scripts/Editor/SceneSettingsWindow.cs

@@ -33,7 +33,7 @@ protected override void ApplySettings()
         {
             if (Values[SceneSetting.AddMixedRealityCamera])
             {
-                DestroyImmediate(Camera.main.gameObject);
+                DestroyImmediate(Camera.main.gameObject.GetParentRoot());
                 PrefabUtility.InstantiatePrefab(AssetDatabase.LoadAssetAtPath<GameObject>(AssetDatabase.GUIDToAssetPath(CameraPrefabGUID)));
             }
 
@@ -92,4 +92,4 @@ protected override void OnEnable()
         }
         #endregion // Overrides / Event Handlers
     }
-}
+}

Assets/HoloToolkit/Utilities/Scripts/Extensions/GameObjectExtensions.cs

@@ -73,5 +73,17 @@ public static void ApplyLayerCacheRecursively(this GameObject root, Dictionary<G
                 cache.Remove(child.gameObject);
             }
         }
+
+        public static GameObject GetParentRoot(this GameObject child)
+        {
+            if (child.transform.parent == null)
+            {
+                return child;
+            }
+            else
+            {
+                return GetParentRoot(child.transform.parent.gameObject);
+            }
+        }
     }
-}
+}