HellowNode with Scene

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package jme3test2.helloworld;

import com.jme3.app.SimpleApplication;
import com.jme3.material.Material;
import com.jme3.math.Vector3f;
import com.jme3.scene.Geometry;
import com.jme3.scene.shape.Box;
import com.jme3.math.ColorRGBA;
import com.jme3.scene.Node;

/** Sample 1 - how to get started with the most simple JME 3 application.
 * Display a blue 3D cube and view from all sides by
 * moving the mouse and pressing the WASD keys. @author Sonia
 */
public class HelloNode extends SimpleApplication {

    public static void main(String[] args){
        HelloNode app = new HelloNode(); // instantiate the game
        app.start(); // start the game
    }

    @Override
    public void simpleInitApp() {

        /** create a blue box at coordinates (1,-1,1) */
        Box box1 = new Box(1,1,1);   // create cube shape
        Geometry blue = new Geometry("Box", box1);  // create cube geometry from the shape
        blue.setLocalTranslation(new Vector3f(1,-1,1));
        Material mat1 = new Material(assetManager,
            "Common/MatDefs/Misc/Unshaded.j3md"); // create a simple material
        mat1.setColor("Color", ColorRGBA.Blue);
        blue.setMaterial(mat1);

        /** create a red box straight above the blue one at (1,3,1) */
        Box box2 = new Box(1,1,1);
        Geometry red = new Geometry("Box", box2);
        red.setLocalTranslation(new Vector3f(1,3,1));
        Material mat2 = new Material(assetManager,
            "Common/MatDefs/Misc/Unshaded.j3md");
        mat2.setColor("Color", ColorRGBA.Red);
        red.setMaterial(mat2);

        /** Create a pivot node at (0,0,0) and attach it to the root node */
        Node pivot = new Node("pivot");
        rootNode.attachChild(pivot);

        /** Attach the two boxes to the "pivot" node. (And transitively to the root node.) */
        pivot.attachChild(blue);
        pivot.attachChild(red);

        /** Rotate the pivot node. Note that both boxes have rotated! */
        pivot.rotate(.4f,4f,0f);
    }
}