jme scenegraph traversal test

package playground;

import com.jme3.app.SimpleApplication;
import com.jme3.scene.Node;
import com.jme3.scene.Spatial;

public class TraversalTest extends SimpleApplication {
    @Override
    public void simpleInitApp() {
        Node n_1 = new Node("N-1");
        rootNode.attachChild(n_1);
        Node n_1_1 = new Node("N-1-1");
        n_1.attachChild(n_1_1);
        Node n_1_1_1 = new Node("N-1-1-1");
        n_1_1.attachChild(n_1_1_1);

        Node n_2 = new Node("N-2");
        rootNode.attachChild(n_2);
        Node n_2_1 = new Node("N-2-1");
        n_2.attachChild(n_2_1);
        Node n_2_1_1 = new Node("N-2-1-1");
        n_2_1.attachChild(n_2_1_1);

        /* Graph:
                Root Node
                    N-1
                        N-1-1
                            N-1-1-1
                    N-2
                        N-2-1
                            N-2-1-1
        */

        /* Expected Order (PRE):
            Root Node
            N-1
            N-1-1
            N-1-1-1
            N-2
            N-2-1
            N-2-1-1
        */

        /* Output currently (PRE_ORDER only applied to first call on rootNode):
            Root Node
            N-1-1-1
            N-1-1
            N-1
            N-2-1-1
            N-2-1
            N-2
        */

        /* Output after fix (passing mode to recursive calls in Node.depthFirstTraversal):
            Root Node
            N-1
            N-1-1
            N-1-1-1
            N-2
            N-2-1
            N-2-1-1
        */

        rootNode.depthFirstTraversal((Spatial spatial) -> {
            System.out.println(spatial.getName());
        }, Spatial.DFSMode.PRE_ORDER);
    }

    public static void main(String[] args) {
        TraversalTest app = new TraversalTest();
        app.setShowSettings(false);
        app.start();
    }
}