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Date: Fri, 19 Jul 2013 13:28:21 -0400
From: Ian Chapman <ichapman AT videotron DOT ca>
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To: geda-help AT delorie DOT com
Subject: Re: [geda-help] Toporouter and vias
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Please pardon my ignorance.  I've used pcb a few times over the past 10 
years including the autorouter. What is Toprouter and teardrops?  Is 
this a new pcb feature?  Ian.

On 13-07-19 11:42 AM, Stefan Salewski wrote:
> On Fri, 2013-07-19 at 11:33 +0200, doragasu . wrote:
>> I have experience on EDA tools, but I'm new to geda-pcb. While designing a
>> two layer board to test it, I saw a youtube video demoing the toporouter
> I guess Anthony has mostly concentrated on the rubberband part -- and
> ignored the layer assignment algorithm (LAA). Generally it is the task
> of the LAA to introduce new vias. It may be possible to manually insert
> some vias, which Anthonys toporouter can use.
>
> The LAA, as proposed in the PhD thesis of Tal Dayan is not difficult, so
> maybe you or someone else wants to implement it -- it may be more fun
> than watching videos. Unfortunately is is O(3.5) -- its an optimization
> task, so it is not really fast for large layouts.
>
> You may have seen my own rubberband router -- it is written in Ruby,
> works not too bad, but has currently only graphical PNG output, so it is
> still absolutely useless.
>
> I think, if you really wants autorouting, you may try the non
> topological, geometrical router of PCB program, it is not bad. But of
> course, most people seems to like manually routing better. It may even
> be possible to employ the freerouting router of Mr Wirtz by Specctre
> import/export? But that one is only free as beer.
>
> The teardrops() may be not compatible with the topological autorouter?
> I once used (tested) both, but separately. Last time is used toporouter
> I got only crashes, that was two years ago, maybe it was a result of
> switch to nm as PCB's internal units. Maybe that is fixed now. The
> teardrops() is/was an external plugin, currently I can not remember how
> to call it.
>
>
>