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Date:	Mon, 17 Jun 2013 01:27:21 +0200
From:	Kai-Martin Knaak <kmk AT familieknaak DOT de>
To:	geda-user AT delorie DOT com
Subject:	Re: [geda-user] 3D modelling and gEDA
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Markus Hitter <mah AT jump-ing DOT de> schrieb am 16. June 2013:

> Am 15.06.2013 um 22:56 schrieb Peter Clifton:
>=20
> > the above three mentioned formats are incredibly complex
> > (especially STEP). I would estimate tens of thousands of lines of
> > code go into a STEP -> object structure parser, and that's only the =20
> > beginning
> > of using the format. =20
>=20
> These lines of code are already written, see OpenCascade.
>=20
> But you're right. 3D modeling capabilities are a huuuuge effort, =20
> likely a lot more than what PCB already has. I'd guess equipping a 3D =20
> modeler -OpenSCAD or FreeCAD- with pcb layout functionality -quick =20
> track drawing, connection checking, rat lines drawing, etc.- would be =20
> a lot less effort than the other way around.

I suggest to tell an existing 3D modeller about the geometry of the
board and the position of components. This does not necessarily need to
be done via one of the established general 3D data exchange formats. For
example, freecad is well equipped to read python commands that build the
3D model from primitives and components from a library. Then freecad
can do all the heavy lifting involved with photo realistic rendering,
integration with 3D models of enclosures, 2D sketches for the workshop=20
and finally export to STEP or other established formats. =20

With this work flow, the only thing, pcb would need to know additionally=20
about 3D geometry would be the thickness of layers. Everything else
would be done in freecad, including the 3D models of components.
The amount of reinvention of wheels would be kept to a minimum. It would
put geda way ahead of other open sourced EDA suites :-)

---<)kaimartin(>---
--=20
Kai-Martin Knaak

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