For a variety of reasons, package designers would like to take a Gerber file, and identify and extract all of the metal associated with a particular net or group of nets. Members of the net should be generated by detecting touching or overlapping metal, poly and vias to build connectivity. Gerber file sets routinely have multiple layers of metal; metal layers are interconnected vertically by vias; small "openings" in the dielectric between the metal layers.
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