Is the problem you are haveing is getting the metal to look like metal? What I have found works well is to use one of the metal preset textures in bryce such as brushed puter. This alone looks alright, but seems to look more like a miror than metal. What you need to do is make a bump map and apply it to the texture. I like to make my own in photoshop. You want it to look like the grain in a metal. An east way to do this is to open a new document in photoshop and paint the background a mid shade of grey the use the one of the textures filters I think verticle texture looks good for metals. Just play with the settings untill you get a lot of very close together very fine lines. and save it. Then go into bryce texture editor. Click the dot in the bump section over into one of the holes which will bring up a texture off to the right. click the right button on the botom left of the texture window to turn that into a picture texture. Then go into the source editor and load the bump map you made into both blocks. click the check then set your bump height to like .5 or so. Now go out and re render it. This very small amount of bump should brake up the surface of the metal just enough to make it look like steel rather than a miror.