Can't see Cylinder

Hi All

I need your help please.

What is wrong with the following code? I can't see the Cylinder I created.

Only see Black screen.

Thank u in advance

BranchGroup objRoot = new BranchGroup();

Cylinder cy = new Cylinder(radius,height);

ColoringAttributes ca = new ColoringAttributes();

ca.setColor (0.5f, 0.7f, 0.0f);

Appearance app = new Appearance();

app.setColoringAttributes(ca);

TransparencyAttributes trans = new TransparencyAttributes();

trans.setTransparency(0.75f);

app.setTransparencyAttributes(trans);

cy.setAppearance(app);

Transform3D rot = new Transform3D();

TransformGroup tg = new TransformGroup(rot);

tg.addChild(cy);

objRoot.addChild(tg);

objRoot.compile();

of course objRoot is added to SimpleUniverse class but to make things short I won't show it here

[898 byte] By [Eyal2007a] at [2007-11-26 22:32:06]