docs: public void setScene(GVRScene scene)
      {
          mPicker.setScene(scene);
          if (scene != null)
          {
              synchronized (mCursorLock)
              {
                  if (mDragRoot.getParent() != null)
                  {
                      mDragRoot.getParent().removeChildObject(mDragRoot);
                  }
                  scene.getMainCameraRig().addChildObject(mDragRoot);
              }
          }
          this.scene = scene;
      }