[JAVA3D] Problem with code

[Saeed Ansari]

Hello All,

I have written below code , but nothing appears on the screen.What is the problem?

 

public class J3D extends Frame {
  VirtualUniverse virtual;
  Locale locale;
  BranchGroup bg;
  Canvas3D c3D;
  TransformGroup tg;
  Transform3D trans3d;
  ViewPlatform viewPlatform;
  View view;
  public J3D() {
    virtual = new VirtualUniverse();
    locale = new Locale(virtual);
    c3D=new Canvas3D(SimpleUniverse.getPreferredConfiguration());
    bg=new BranchGroup ();
    tg=new TransformGroup();
    trans3d=new Transform3D();
    viewPlatform =new ViewPlatform();
    init();
  }
  public void init(){
    setLayout(new BorderLayout());   
    add("Center",c3D);
    setSize(500,500);
    ColorCube cube=new ColorCube(0.25f);
    tg.addChild(cube);   
    trans3d.setTranslation(new Vector3f(0.0f,0.0f,-2.0f));   
    tg.setTransform(trans3d);
    bg.addChild(tg);
    locale.addBranchGraph(bg);
    show();
  }
public static final void main( String args[]){
   J3D j3d= new J3D();
 }
 

 
}

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