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Date: Sun, 10 Jan 2016 09:33:42 +0100
From: "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Subject: Re: [geda-user] (draw on insulating layers)
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On Sun, 10 Jan 2016 00:27:46 +0100
geda AT psjt DOT org (Stephan Böttcher) wrote:

> DJ Delorie <dj AT delorie DOT com> writes:
> 
> >> Inventing your own private meanings for common words is not a good
> >> path to comprehension.
> >
> > I didn't invent them.
> >
> > And they're pretty common in industry.  (example: photoshop layers
> > aren't always "material" and Eagle has more layers than just the
> > physical ones)
> 
> The Gerber spec that you can find following links from the gerbv page
> replaced the word "layer" with "levels" when talking about stacking
> polarity.  Basically, whenever you switch from positive to negative
> polarity or back, a new "level" is entered implicitly.
> 
> Stephan

I would say even if gerber have proble handling negative polarity workaround is done today for copper layers and work so it would make sense with cut out in pcb/gpcb. I think a cut outs width height would make sense for footprint court yard it would "say" space is needed and if placed on internal layer it would cut thru material above it.



I also discovered Acamco realeased a new gerber specification first of January this year.


Nicklas Karlsson