Fix clipping state bug (partial)

js/state.js

@@ -1,6 +1,7 @@
 export const AppState = {
     // The root scene object
     root: null,
+    mainNodeId: null,
     initialRotation: null,
     camera: ATON.Nav._camera,
     renderer: ATON._renderer,
@@ -11,8 +12,12 @@ export const AppState = {
     map : null,
     clipping : {
         enabled: false,
+        plane : null,
+        controls: null,
+        onDrag: null,
         helper : null,
-        rootBoundingBox: null,
+        // Change to boundingSphere
+        boundingSphere: null,
         listeners: {
             button: false,
             plane: false,