code: private void notifyMainSceneReady() {
          runOnTheFrameworkThread(new Runnable() {
              @Override
              public void run() {
                  // Initialize the main scene
                  getEventManager().sendEvent(mMainScene, ISceneEvents.class, "onInit", GVRViewManager.this, mMainScene);
  
                  // Late-initialize the main scene
                  getEventManager().sendEvent(mMainScene, ISceneEvents.class, "onAfterInit");
              }
          });
      }
docs: returns.