Setting Transparency recursively.

[Amos Wenger]

Can anyone help me ?
I have written a function to set all the shape3Ds of a BranchGroup transparent, but it don't display transparent.
Here is the source code :

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// Fonction activant ou désactivant l'affichage transparent  void setAffTrans(Group group,boolean param) {     TransparencyAttributes ta = new TransparencyAttributes();     if( param ) {       System.out.println("Met transparency à 0.5");       ta.setTransparency(0.5f);     }     else {       System.out.println("Met transparency à 0");       ta.setTransparency(0);     }     //ta.setTransparencyMode(TransparencyAttributes.BLENDED);    //ta.setMode(TransparencyAttributes.BLENDED);         Enumeration e = group.getAllChildren();     while(e.hasMoreElements()) {       Node node = (Node) e.nextElement();             if(node instanceof Group) {         System.out.println("Transparence : c'est un group");         setAffTrans((Group)node,param);       }       else {         if(node instanceof Shape3D) {           System.out.println("Transparence : c'est un Shape3D");           Shape3D shp = (Shape3D)node;           shp.getAppearance().setTransparencyAttributes(ta);           shp.getAppearance().setChanged(true);         }       }     }     };

[LaLiLuLeLo]

My workaround was to make a new appearance and applying it to the shape as opposed to getting the appearance from the shape and modifying it. I think the lack of transparencies have something to do with the presence of materials. I'll let you know more as I delve into it.

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//a = s.getAppearance();            a = new Appearance();             Material m = a.getMaterial();             //m.setEmissiveColor(255f,0,0);            //a.setMaterial(m);                         TransparencyAttributes ta = new TransparencyAttributes(TransparencyAttributes.BLENDED,0.4f);             a.setTransparencyAttributes(ta);                         s.setAppearance(a);

Edit:
Just found out that setting the material to null makes the transparency work. So you don't need to make a new appearance; just use the shape's one and set its material to null ...

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Appearance a = s.getAppearance();             //Material m = a1.getMaterial();            //a = new Appearance();                        //m.setEmissiveColor(255f,0,0);            //a.setMaterial(m);                         TransparencyAttributes ta = new TransparencyAttributes(TransparencyAttributes.BLENDED,0.4f);             a.setTransparencyAttributes(ta);             a.setMaterial(null);             s.setAppearance(a);

[ewills]

You could also try setting the Material's color target.  I had to do this to get transparency working.

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[LaLiLuLeLo]

Could you please explain this a little more? I tried this but no success...thanks  

1	a.getMaterial().setColorTarget(Material.NONE);

[ewills]

Here is my default Appearance setup:

material = new Material();
material.setColorTarget(Material.DIFFUSE);
material.setAmbientColor(AMBIENT_COLOR);
material.setSpecularColor(SPECULAR_COLOR);
material.setShininess(96.0f);

coloringAttributes = new ColoringAttributes();
coloringAttributes.setColor(DIFFUSE_COLOR);

polygonAttributes = new PolygonAttributes();
polygonAttributes.setCullFace(PolygonAttributes.CULL_BACK);

appearance = new Appearance();
appearance.setMaterial(material);
appearance.setColoringAttributes(coloringAttributes);
appearance.setPolygonAttributes(polygonAttributes);

Transparency can then be set using:

TransparencyAttributes ta = new TransparencyAttributes();
ta.setTransparencyMode(TransparencyAttributes.BLENDED);
ta.setTransparency(t);
appearance.setTransparencyAttributes(ta);

Hope this helps