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Subject: Re: [geda-user] (features: layers stack, padstack/vias)
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From: John Doty <jpd AT noqsi DOT com>
In-Reply-To: <s6n60z36roh.fsf@blaulicht.dmz.brux>
Date: Sat, 9 Jan 2016 06:37:44 -0500
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On Jan 9, 2016, at 4:14 AM, Stephan B=F6ttcher <geda AT psjt DOT org> wrote:

> "Lev (leventelist AT gmail DOT com) [via geda-user AT delorie DOT com]"
> <geda-user AT delorie DOT com> writes:
>=20
>> On Fri, 8 Jan 2016 17:52:59 +0100
>> "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via
>> geda-user AT delorie DOT com]" <geda-user AT delorie DOT com> wrote:
>>=20
>>> In preferences-->Layers-->Groups some of the layers are listed but
>>> not all are listed. What do you think is missing?
>>=20
>> I would add explicitly the insulation layers, and documentation =
layers, silks,
>> etc. I'd add user defined layers as well. I'd add some logic like =
"XOR this
>> layer with that, and use it as conductive 2."
>=20
> I'd prefer the format/data model to become more general and =
orthogonal,
> not more explicit layer types.

One of the things I find confusing about pcb is that layers have types. =
That=92s not physics. Layers are made of materials.

>  All layers that need to be described
> needs an explicit entry in the layerlist and can be drawn on.
>=20
> If you want to draw on an insulation layer, just add it.  If you do =
not
> want to draw on it, there is little reason to add it.

But you almost always draw on the insulators. Layers without holes are =
rare.

>  It should not be
> required to describe the board, unless the data model/format lacks =
other
> attachment points for its dialectric properties attributes.
>=20
> NB: Since the primary target export is Gerber, I propose to implement
> the level concept from that standard somehow.  Each object shall be
> explicitly assigned to a layer, and a level on the layer.  Even levels
> draw, odd levels clear. Standard library level assignment could be:
>=20
>  level 10: polygons
>  level 25: holes in polygons
>  level 35: clearances around lines
>  level 40: lines.
>  level 50: pads
>=20
> A Line object would not need to include its clearance directly, but
> there would be a second line on the clearance layer.  But those two
> objects must be linked to each other both in the file format and the
> data model, so maybe that is not a good idea.
>=20
> OTOH, generic compond objects are require too, for Vias, Elements, and
> hierarchy, why not for Lines and Arcs as well?
>=20
> In other words, please think more generic not more special case.  The
> GUI shall encapsulate all that with more specialized tools and
> defaults.
>=20
> Line( (("attribute" value) ...) (("layer1" level1 width1) ("layer2" =
level2 width2) ...) ((x1 y1) (x2 y2) ...) )
>=20
> --
> Stephan
>=20

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



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