@Override
    public Box clone() {
        return new Box(center.clone(), xExtent, yExtent, zExtent);
    }
Creates a clone of this box.
<p>
The cloned box will have '_clone' appended to its name, but all other
properties will be the same as this box.
jme3-core/src/main/java/com/jme3/scene/shape/Box.java