I've added <normal_smoothing>true</normal_smoothing> but it doesn't works ...

Thanks for the help Phil!
I'm gonna read that post.
Anyway so far has been done a great job on the exporter and it works really good!

Yes, I've a sun lamp.
To see the emitters object working properly I've to export as background and not as sunlight ... this sounds weird, since in those images it seems there's a sunlight as well.

Ok, it seems I've fixed a bit: now it reflects, but the emitter light appears as a black shader ...

I'm trying to create a simple reflection shader like this: http://www.indigorenderer.com/blender_tut/phong2.jpg or this: http://www.indigorenderer.com/blender_tut/specular1.jpg As the tutorial says, I've to turn on the Ray Transp, but I don't get that result. It doesn't reflect anything: by the way ...