X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f X-Recipient: geda-user AT delorie DOT com X-Virus-Scanned: Debian amavisd-new at gag.com From: Bdale Garbee To: Peter Clifton , geda-user AT delorie DOT com Subject: Re: [geda-user] pcb: Patch for arcs with different radii for x and y on screen In-Reply-To: <1403900109.6474.8.camel@pcjc2lap> References: <53A7E8F0 DOT 8020905 AT philippklostermann DOT de> <1403800440 DOT 25929 DOT 14 DOT camel AT pcjc2lap> <20140627112707 DOT GB21723 AT visitor2 DOT iram DOT es> <1403900109 DOT 6474 DOT 8 DOT camel AT pcjc2lap> User-Agent: Notmuch/0.18 (http://notmuchmail.org) Emacs/23.4.1 (x86_64-pc-linux-gnu) Date: Fri, 27 Jun 2014 15:14:16 -0600 Message-ID: <877g422gyf.fsf@rover.gag.com> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha512; protocol="application/pgp-signature" 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 --=-=-= Content-Transfer-Encoding: quoted-printable Peter Clifton writes: > How would you select from/to layers? Would we constrain the end-points > to physically realisable ones? IE... should I allow modelling a via that > would not be possible to achieve, e.g. from layer 1-5 in a 6 layer > board? Real-world blind and buried vias always connect a range of layers from N to M. The tricky bit in my experience in large-layer-count boards was always when there were multiple buried vias with the same X-Y coordinate. In other words, something like layers 2-3 and 6-7 connected in an 8-layer board. > How does all this interact with moving objects etc.. between layers? If you move a trace off a layer where the via exists, it disconnects. If you move a trace onto a layer where a via exists, it connects. What over interesting cases can you think of? > How are blind and buried vias represented for manufacturing? Different > drill-files for each of the from-to layer pairs? Good question. I don't know, but we could find out. > Should we pre-define a list of legal vias (like pad-stacks), and then > allow choice between them, or should each one be completely > independently defined? Good question. In the past, the tools I used mostly thought in terms of pad stacks. But it has been years since I worked on a board where I actually needed blind or buried vias.=20=20 Bdale --=-=-= Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIVAwUBU63eqDqTYZbAldlBAQpJaxAAmu2xKKGJZp/dnGcFAN7AZwlvdpWKqAAK isBaFrSAtXBY1dNAy283jT7qplJRSOxnoPgrcek71g4O0SSlPzRjj1HA8Vm/JthP YHLyHS7jjra23M5nCb5vE2fykdZ6IHtwbf+EPMAQJBzc3hUPmVr/QpqaE+AxYQvO S2bJUKOOE/s1coIZLAUVnYwUuNzcqW658d8B9JX5zeVXAlKrM7hkMmcYs2RI9JCF AX4wZsVEi9foJ31zpELOHH0smiMaj4fBemPOtQZ+Tvq9y+SB5oYT/fo0LVSPMH1H +nivtxPNqLVJ0KyTd0U75kBaSAM5v8w9hE5a6OUllAAoOHLeiWJUN0/LM6PWiGQd o7xyIO4AtLxQ442WmGCOqxxS98RdgoPBCcgddcAnn5OHIBsSR9SkELwJEZlBJhyy Zq9fpAZlF63OmLb+FMI6W9aHTAs9OYrujN/8scsPX8XyRjo+9FeYNKrWk/T+/Uqr IX3aHYMsvThdlh7IloNYj2vs6Tp2l6Ln53iWsybLRSlTkd0NVmKoRthlrDQQMZcn 3dIjr0b43SWjF/W8b5Eo+W8SnYj9waXvLV2Zoymd1wLWhm8cWrX0Pfslg+PpeSMM +8mKlIkS4VoEldHk2x3IA72gUmLLCJSPAEqqm4P1VJfny8uoKgpcDIudYLJprq1I uebzolxa8nw= =Bggk -----END PGP SIGNATURE----- --=-=-=--