> The conductors may not be copper. I've even worked with a board that had > two different conductive materials on the same physical layer.
Interesting case. Let's suppose that you have conductors -- say niobium and copper -- on the same physical layer. Does that have implications for PCB? I'm not certain that I see any. I'd imagine that you ultimately need to generate separate gerber files for the two separate conductors. That means putting them on separate layers in PCB (or, I suppose, major architecture changes). If that was an inner layer, you could lay it out as two separate inner layers and that would work, so far as I can see. If the two conductors are both on the top outer layer, I believe that you could use the same strategy, defining both to be in the same "component side" layer group. Am I missing something? _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user