X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient: geda-user AT delorie DOT com
X-TCPREMOTEIP: 63.119.35.194
X-Authenticated-UID: jpd AT noqsi DOT com
Content-Type: multipart/signed; boundary="Apple-Mail=_2841959C-EA4E-418E-965E-5FB6A64892C8"; protocol="application/pgp-signature"; micalg=pgp-sha512
Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\))
Subject: Re: [geda-user] A fileformat library (blind/buried vias)
X-Pgp-Agent: GPGMail 2.5.2
From: John Doty <jpd AT noqsi DOT com>
In-Reply-To: <20160106145428.b829e7ebe8f7f93b6a644259@gmail.com>
Date: Wed, 6 Jan 2016 09:19:04 -0500
Message-Id: <6BB2957D-7001-4E0B-BA95-47868F91DE17@noqsi.com>
References: <1512221837 DOT AA25291 AT ivan DOT Harhan DOT ORG> <CAC4O8c9bxJP1eMG4yz3YwKkQJRmsDGmLQ0aMd5pJRyu0WpdCtQ AT mail DOT gmail DOT com> <C1CFCCEE-C64A-4E49-AA64-446C061656D6 AT noqsi DOT com> <CAC4O8c-zt8B=joDd+ws77D2jt6aZf3MWfR_dAvpzGcNuBrTURQ AT mail DOT gmail DOT com> <alpine DOT DEB DOT 2 DOT 11 DOT 1601030040320 DOT 2176 AT newt> <D9825C8C-B6FD-4C7F-A8D5-B8AF06253B72 AT noqsi DOT com> <CAC4O8c_R5xWLmzj_cz0g0mPWNs6mR4efjXKGBoup8YO6nwnPTA AT mail DOT gmail DOT com> <A942261D-7C25-4F2D-9CB1-FFC60FA1C160 AT noqsi DOT com> <CAC4O8c8zk8=Py1yX6fVqF+35SYe39Li=y4jZ8bCeZ1Ev8WccAg AT mail DOT gmail DOT com> <20160105182120 DOT 3237F809D79B AT turkos DOT aspodata DOT se> <8E0210CD-0694-4717-A7B1-3224E39691DA AT sbcglobal DOT net> <CAC4O8c8CxyULauKj+1RT73qdLDnPa1_TOAXY_pXnJNPtnNJYqQ AT mail DOT gmail DOT com> <s6nziwjt23p DOT fsf AT falbala DOT ieap DOT uni-kiel DOT de> <alpine DOT DEB DOT 2 DOT 00 DOT 1601061228131 DOT 9035 AT igor2priv> <CAJXU7q-ygqW+Jok60vHC1dre9Q0aF4cUo8_5KXvouTW3L5c57A AT mail DOT gmail DOT com> <20160106135339.80f8121dd33! cddd92c5acb8a AT gmail DOT com> <42CFD5A8-B3C1-4BB2-8D5E-7FF582332FCF AT noqsi DOT com> <20160106145428 DOT b829e7ebe8f7f93b6a644259 AT g!
 mail.com>
To: geda-user AT delorie DOT com
X-Mailer: Apple Mail (2.1878.6)
Reply-To: geda-user AT delorie DOT com
Errors-To: nobody AT delorie DOT com
X-Mailing-List: geda-user AT delorie DOT com
X-Unsubscribes-To: listserv AT delorie DOT com
Precedence: bulk


--Apple-Mail=_2841959C-EA4E-418E-965E-5FB6A64892C8
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain;
	charset=windows-1252


On Jan 6, 2016, at 8:54 AM, Nicklas Karlsson =
(nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com] =
<geda-user AT delorie DOT com> wrote:

>> 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.
>>=20
>> 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.
>>=20
>> =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. ...
>=20
>=20
> I think of layout data as a bunch on drawing primitives drawn on =
different layers,

Which presumes a model of layers to start from.

> everything else is just structure to make handling easier.
>=20
> Some data or drawing primitives are bunched together in something =
called a footprint so it could be manipulated all at once.
>=20
> If it where possible to bunch together the ordinary drawing primitives =
including drilled plated or not holes in something called a via it would =
be no problem to draw buried vias?

Yes. But part of the reason pcb can=92t do this is that it doesn=92t =
model all of the layers in a consistent way, especially the insulating =
ones.

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

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



--Apple-Mail=_2841959C-EA4E-418E-965E-5FB6A64892C8
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
	filename=signature.asc
Content-Type: application/pgp-signature;
	name=signature.asc
Content-Description: Message signed with OpenPGP using GPGMail

-----BEGIN PGP SIGNATURE-----
Comment: GPGTools - https://gpgtools.org
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=5shc
-----END PGP SIGNATURE-----

--Apple-Mail=_2841959C-EA4E-418E-965E-5FB6A64892C8--