I ran across a thread a while back on doing a 3D box, that I believe Rik did. Shown is the example box. Can someone point me to tutorial or link on how to do the "shading" effect on the front of the box? Is just a overlapping of different shapes with different transparencies? I played around with the transparency tool, but didn't get the same effect.

I am new to this and get over whelmed by all of the cool effects you guys do. Is there a "central" location that might show samples of looks, and a how to? Also the 3D box thread link, can't seem to find again.

Click image for larger version.  Name: 3D Box.jpg  Views: 133  Size: 30.0 KB  ID: 82466

Thanks
Al