Ajuda simples java

Olá pessoal gostaria se possivel que me ajudassem com esse exercicio.O que tenho que fazer é o seguinte criar outro cubo embaixo desse e fazer que ele rotacione para o lado esquerdo ou seja ao contrario.Ja tentei mas não consigo ficaria muito grato se alguém me ajudar.O código abaixo é de um cubo que rotaciona para a direita

import java.applet.Applet;

import java.awt.BorderLayout;

import java.awt.event.*;

import java.awt.GraphicsConfiguration;

import com.sun.j3d.utils.applet.MainFrame;

import com.sun.j3d.utils.geometry.ColorCube;

import com.sun.j3d.utils.universe.*;

import javax.media.j3d.*;

import javax.vecmath.*;



public class HelloUniverse extends Applet {



    private SimpleUniverse u = null;

    

    public BranchGroup createSceneGraph() {

	// Create the root of the branch graph

	BranchGroup objRoot = new BranchGroup();



	// Create the TransformGroup node and initialize it to the

	// identity. Enable the TRANSFORM_WRITE capability so that

	// our behavior code can modify it at run time. Add it to

	// the root of the subgraph.

	TransformGroup objTrans = new TransformGroup();

	objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);

	objRoot.addChild(objTrans);



	// Create a simple Shape3D node; add it to the scene graph.

	objTrans.addChild(new ColorCube(0.4));



	// Create a new Behavior object that will perform the

	// desired operation on the specified transform and add

	// it into the scene graph.

	Transform3D yAxis = new Transform3D();

	Alpha rotationAlpha = new Alpha(-1, 4000);



	RotationInterpolator rotator =

	    new RotationInterpolator(rotationAlpha, objTrans, yAxis,

				     0.0f, (float) Math.PI*2.0f);

	BoundingSphere bounds =

	    new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);

	rotator.setSchedulingBounds(bounds);

	objRoot.addChild(rotator);



        // Have Java 3D perform optimizations on this scene graph.

        objRoot.compile();



	return objRoot;

    }



    public HelloUniverse() {

    }



    public void init() {

	setLayout(new BorderLayout());

        GraphicsConfiguration config =

           SimpleUniverse.getPreferredConfiguration();



	Canvas3D c = new Canvas3D(config);

	add("Center", c);



	// Create a simple scene and attach it to the virtual universe

	BranchGroup scene = createSceneGraph();

	u = new SimpleUniverse(c);



        // This will move the ViewPlatform back a bit so the

        // objects in the scene can be viewed.

        u.getViewingPlatform().setNominalViewingTransform();



	u.addBranchGraph(scene);

    }



    public void destroy() {

	u.cleanup();

    }



    //

    // The following allows HelloUniverse to be run as an application

    // as well as an applet

    //

    public static void main(String[] args) {

	new MainFrame(new HelloUniverse(), 256, 256);

    }

}