Minor improvements: clipping, state management

Warning: potentially very buggy!!

js/state.js

@@ -1,6 +1,7 @@
 export const AppState = {
     // The root scene object
     root: null,
+    initialRotation: null,
     scenes : [],
     ambientOcclusion : true,
     shadows : true,
@@ -9,6 +10,8 @@ export const AppState = {
     clipping : {
         enabled: false,
         helper : null,
+        rootBoundingBox: null,
+        listenerAdded: false,
     }
 }
 
@@ -28,5 +31,22 @@ export function getSceneStatus(id) {
  * @returns {Boolean}
  */
 export function setSceneStatus(id, status) {
-    return AppState.scenes.find(s => s.id === id).active = status;
+    AppState.scenes.find(s => s.id === id).active = status;
+}
+
+export function getCurrentScene() {
+    return AppState.scenes.find(s => s.current);
+}
+
+/**
+ * 
+ * @param {String} id The scene's id
+ * @returns 
+ */
+export function setCurrentScene(id) {
+    // First set the correct status for the other scenes
+    let otherScenes = AppState.scenes.filter(s => s.id !== id);
+    otherScenes.forEach(scene => scene.current = false)
+        
+    AppState.scenes.find(s => s.id === id).current = true;
 }