@Override
  public void simpleUpdate(float tpf) {
    Quaternion q = new Quaternion();
    angle += tpf;
    angle %= FastMath.TWO_PI;
    q.fromAngles(angle, 0, angle);

    offBox.setLocalRotation(q);
    offBox.updateLogicalState(tpf);
    offBox.updateGeometricState();
  }