[JAVA3D] Lighting ?

[firas]

Hello,
I am new to Java3D. In my appli., I create volumes as QuadArrays. I am coloring them and put them by order

ones on the others. This works as expected. My problem is when I am trying to use some kind of lighting

to give them more natural impression. I tried to use the directional light as in the examples delivered

in Java3D, without any success ...?

I tried som thing like the following but with changing values many times :

    BoundingSphere bounds = new BoundingSphere();

    bounds.setRadius(1000);
 
    DirectionalLight lightD = new DirectionalLight();
    lightD.setInfluencingBounds(bounds);
    objRoot.addChild(lightD);
    
    Background background = new Background();
    background.setColor(1.0f, 1.0f, 1.0f);
    background.setApplicationBounds(bounds);
    objRoot.addChild(background);
the radius is taken as 1000 because of my coordinates which are of 
order :
600, 360, ..etc.
Thanx for any help.
Another question :
I am rebdering the geometry  with either POLYGON_FILL or
POLYGON_LINE :
PolygonAttributes polygonAttributes = new PolygonAttributes ();
 polygonAttributes.setPolygonMode(PolygonAttributes.POLYGON_FILL);
 polygonAttributes.setCullFace(PolygonAttributes.CULL_NONE);
Is it possible to fill the geometry and to show lines in the same time
..?
Thanx
Firas