@Override
    public void cloneFields(Cloner cloner, Object original) {
        this.debugNode = cloner.clone(debugNode);
        this.spline = cloner.clone(spline);
        /*
         * The clone will share both the asset manager and the list of listeners
         * of the original MotionPath.
         */
    }
Callback from {@link com.jme3.util.clone.Cloner} to convert this
shallow-cloned MotionPath into a deep-cloned one, using the specified
cloner and original to resolve copied fields.

@param cloner the cloner that's cloning this MotionPath (not null)
@param original the object from which this MotionPath was shallow-cloned
(not null, unaffected)
jme3-core/src/main/java/com/jme3/cinematic/MotionPath.java