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Subject: Re: [geda-user] A fileformat library (blind/buried vias)
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From: John Doty <jpd AT noqsi DOT com>
In-Reply-To: <20160106135339.80f8121dd33cddd92c5acb8a@gmail.com>
Date: Wed, 6 Jan 2016 08:22:09 -0500
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On Jan 6, 2016, at 7:53 AM, Nicklas Karlsson =
(nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com] =
<geda-user AT delorie DOT com> wrote:

>> What may be a little harder, is updating the gui and renders to give =
a
>> sensible interface for creating and editing this type of design =
feature.
>>=20
>> Since it blocks the 3D stuff, I'm taking an interest here (regarding =
more
>> explicit board construction info / layer stack description), and I =
have
>> plans to address this.
>>=20
>> I will also put my hand up to do the blind / buried vias, at least =
the back
>> end part, and possibly a basic gui implementation in one HID - unless
>> anyone is desperate to beat me to it!
>>=20
>> Peter
>=20
> Then I want to ask you think about group together a bunch of the =
ordinary drawing primitives and call it a: connection point, pad stack, =
pin or in this case a via? Do it need a new file format? Or could it be =
done with current file format maybe treated similar as a footprint?
>=20
> Since something new should be started this could be a good point to =
start and if works there are further advantages for other use cases. I =
expect to have some time contribute on a rather regular basis from now =
on.
>=20
> As far as I cant tell "PCB preferences" put the layers in order so I =
guess it now about order.

For this pcb non-user, one of the biggest sources of confusion that =
drives me away is that pcb does not really have layers at its =
foundation.

I think of a printed circuit board as a stack of patterned layers of =
various materials: epoxy glass, constantan, copper, teflon, solder mask, =
etc. Plated holes are an exception to the general paradigm, but I think =
they=92re the only one unless you=92re into 3D printing.

=46rom that point of view, a simple buried via is a piece of copper with =
a hole in it on one layer, a plated hole in the insulating layer below =
it, and a piece of copper with a hole in it on the next layer down. I, a =
stupid user, want to know why I can=92t simply draw that. I should not =
need a special feature to be able to draw a simple structure. It might =
be handy to have a =93macro=94 to make it convenient to draw such =
things, but the lack should not prevent me from drawing what I need.

What pcb calls =93layers=94 are not fundamental. They are products of =
the complex structures that its confusing grab bag of features =
implements.

>=20
>=20
> Nicklas Karlsson
>=20

John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd AT noqsi DOT com



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