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Date: Fri, 30 Jan 2015 17:47:22 -0500
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Subject: [geda-user] Re:
From: Jason White <whitewaterssoftwareinfo AT gmail DOT com>
To: geda-user AT delorie DOT com
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My theory: You lost your ground plane on the top layer when you
connected the last trace; you boxed it out (see the difference in the
images?). Now you've got a bunch of things that are disconnected from
ground; however, the presence of ground plane on the layer below
results in a zero distance rats nets lines from all of the pads. I
believe those are your circles.

On Fri, Jan 30, 2015 at 1:03 PM, Bernhard Kraft <kraftb AT think-open DOT at> wrote:
> Content preview:  Hi, First I would like to say hello as this is my first
> post
>    to this list. Until now I only contributed some gschem symbols to the
> geda
>    project: http://www.gedasymbols.org/user/bernhard_kraft/ I have a
> question
>    regarding a simple 2 layer board. Usually I etch prototypes at home so I
>   already have some homebrew-design-rules like not placing a via under a SMD
>    component, etc. [...]
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> Subject: Connecting GND planes
> X-SA-Exim-Version: 4.2.1 (built Mon, 26 Dec 2011 16:24:06 +0000)
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>
> Hi,
>
> First I would like to say hello as this is my first post to this list. Until
> now I only contributed some gschem symbols to the geda project:
> http://www.gedasymbols.org/user/bernhard_kraft/
>
> I have a question regarding a simple 2 layer board. Usually I etch
> prototypes at home so I already have some homebrew-design-rules like not
> placing a via under a SMD component, etc.
>
> To simplify describing the problem here is a picture of a part of a PCB:
> http://picpaste.de/screen1-Bp7Roqnq.png
>
> Ok. Looks like I am almost finished. Only one ratsnest to route. But if I
> route the remaining rat the following happens:
> http://picpaste.de/screen2-ZR9DJ7G6.png
>
> The new trace stopped the top-GND polygon (green) from flooding the area as
> it is (unintentionally) isolated by top-CU traces.
>
> I already tried placing vias into the isolated areas, I tried it before and
> after isolating it with the last trace. I tried different thermals onto the
> via - no way.
>
> Is this a bug? Should it get reported? Is the only workaround to manually
> draw additional polys and connect them with vias?
>
>
> greetings,
> Bernhard
> --
> Wer nicht gelegentlich auch einmal kausalwidrige Dinge zu denken vermag,
> wird seine Wissenschaft nie um eine neue Idee bereichern können.
> Max Planck (1858-1947)


-- 
Jason White