docs: public void onDrawFrame(float frameTime)
      {
          GVRSceneObject owner = getOwnerObject();
          if (owner == null)
          {
              return;
          }
          if (mSwitchIndex < 0 || mSwitchIndex > owner.rawGetChildren().size())
          {
              return;
          }
          int i = 0;
          List<GVRSceneObject> children = owner.rawGetChildren();
          for (GVRSceneObject child : children)
          {
              child.setEnable(i++ == mSwitchIndex);
          }
      }