c.lookAt(new Vector3f(0,0,0));
Vector3f objectCenter=((BoundingSphere)rootNode.getWorldBound()).center; Vector3f lookAtObject=new Vector3f(objectCenter).subtractLocal(c.getLocation());  c.setDirection(lookAtObject);
    protected void simpleUpdate(){        Camera c=display.getRenderer().getCamera();        c.lookAt(new Vector3f(0,0,0));//        c.setFrame(c.getLocation(),new Vector3f(-1,0,0),new Vector3f(0,1,0),new Vector3f(c.getLocation()).negateLocal());        c.update();    }