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	Wed, 27 Jan 2016 09:13:18 -0800 (PST)
Date:	Wed, 27 Jan 2016 18:13:08 +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] The nature of gEDA users
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> >> No.  The circle connecting the copper circles is on a different layer,
> >> and is not negative, i.e., not a cutout.  The gerber export of a copper
> >> layer has no hole where the drill hits.
> >
> > The circles connecting the layers are drilled thru board and are hence
> > a cut out in the board which is later plated. The gerber export of a
> > copper layer has no hole where the drill hits but it does not matter
> > because the drill will make a hole, a proper model of layer would
> > however have a hole there the drill hits.
> 
> Well, this is exactly not what I propose.
> 
> I do not need a "propper model of a piece of copper" And a via is not a
> drilled hole but a body of aluminum that is deposited onto an square
> etched into a layer of SiO2.

Well then I guess your via could be modeled as a square cutout in the SiO2 but here it is a difference if there is a hole in middle or not. I still guess possibility to draw the necessary drawing primitives on the layers are very useful, or?

> > a via is a composite of objects on different layers. 
> 
> That is true.  Including the layer that tells what is conductively
> connected.

Then it would only be necessary to look on drawing primitives on conductive layer and conductivity layer to figure electrical connections and for DRC check of clearance?


Nicklas Karlsson

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