public ChaseCamera(Camera cam, Spatial target, HashMap props) { super(); this.cam = cam; this.target = target;  setupMouse(); updateProperties(props);
public ChaseCamera(Camera cam, Spatial target) { this(cam, target, null);
    public ChaseCamera(Camera cam, Spatial target, HashMap props) {        super();        this.cam = cam;        this.target = target;        setupMouse();        updateProperties(props);    }