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Date: Wed, 02 Dec 2015 08:50:38 +1300
From: "Lilith Bryant (dark141 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Subject: Re: [geda-user] PCB: clearouts in polygons slightly off, fix?
To: geda-user AT delorie DOT com
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	geda-user AT delorie DOT com on Wed Dec  2 08:15:59 2015)
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On 2015-12-02 08:15:59 AM, Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com] wrote:
> Yes for cases where the output is demonstrably "wrong" there is a problem
> hidden somewhere.
> 
> Approximation is more about needed accuracy, in real life accuracy is never
> perfect. If approximation start to add up for example each time an object is
> moved it is however a problem, I guess a grid more course than total
> approximation error could solve this.
> 
> Nicklas Karlsson
> 
> 
> 
> On Tue, 1 Dec 2015 13:41:13 -0500
> DJ Delorie <dj AT delorie DOT com> wrote:
> 
> > 
> > My personal preference is that, for cases where the output is
> > demonstrably "wrong", we should fix it.  In this particular case,
> > we're producing incorrect gerbers (although only *slightly* incorrect,
> > but if you're pushing the limits, that might be enough) and if
> > correcting our mistake causes warnings for others, those are warnings
> > they should have been getting all along anyway ;-)
> > 
> > One could argue that by approximating curves with lines we're "wrong"
> > anyway, but then again, since the user has no control over how we do
> > that, a minor tweak in how we do that should still be within our
> > domain.
> 


I reported (and submitted a patch for) something similar than my board house picked up:

https://bugs.launchpad.net/pcb/+bug/1100620

No takers so far though...