Well, I tried with fully black material(instead of gray glass), but the transparence is not really sadisfing me, it seems to be just a shadow on the back objects... In my case, I saved as collada or obj any of the following Ikea Besta object, with glass door:

http://sketchup.google.com/3dwarehouse/ ... 8639c89784

But the results are very poor, even changing the d parameter (that is correctly generated by sketchup export engine) or changing the original material in several way: using colored or fully black.

Could you please tell me what's wrong? I'm spending my nights on it..

Many thanks

Regards
Massimo