@Override
    public void cloneFields(Cloner cloner, Object original) {
        super.cloneFields(cloner, original);

        collisionListeners = cloner.clone(collisionListeners);
        centerLocation = cloner.clone(centerLocation);
        centerVelocity = cloner.clone(centerVelocity);
    }
Callback from {@link com.jme3.util.clone.Cloner} to convert this
shallow-cloned control into a deep-cloned one, using the specified cloner
and original to resolve copied fields.

@param cloner the cloner that's cloning this control (not null, modified)
@param original the control from which this control was shallow-cloned
(not null, unaffected)
jme3-jbullet/src/main/java/com/jme3/bullet/animation/DynamicAnimControl.java