Problem in the nodeCamera

hi,





i need put a nodeCamera  in the model to the extent that this model moves in the scene, the camera follow this model





but I tried to do this and the nodeCamera not visualize the model … here's a test I did with a box:





           

Vector3f max = new Vector3f(1, 1, 1);

            Vector3f min = new Vector3f(0, 0, 0);

            box = new Box("Box", min, max);

            box.updateModelBound();

            box.setLocalTranslation(new Vector3f(0, 0, -10));

            box.setRenderQueueMode(Renderer.QUEUE_SKIP);

            box.setModelBound(new BoundingSphere());



          cameraNode = new CameraNode("CameraNode", cam);

          cameraNode.attachChild(box);

          cameraNode.updateWorldData(0);



          rootNode.attachChild(cameraNode);







anyone can help-me?