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Date:	Fri, 21 Jun 2013 12:55:42 -0500
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Subject:	Re: [geda-user] 3D modelling and gEDA
From:	Evan Foss <evanfoss AT gmail DOT com>
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freecad is built on opencascade which we can not integrate because of
the license issues mentioned earlier in the thread.

On Fri, Jun 21, 2013 at 12:33 PM, Milan Prochac <milan AT prochac DOT sk> wrote:
> On 17. 6. 2013 1:27, Kai-Martin Knaak wrote:
>>
>> 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
>> and finally export to STEP or other established formats.
>
>
> The python scripts and boolean operations on objects provided by freecad
> seem promising at first glance. They offer us the level of simplicity which
> gives us opportunity to implement 3D export with limited resources in
> acceptable period of time.
>
> I am practical man, so I tried to implement export of 3D model using freecad
> python scripts (tracks/lines as first step). But the results were
> disappointing. Tracks look more like Escher's stairways than PCB, for more
> "complicated" design (up to 20 lines) script runs for ages, it often fails
> ("Fusion failed" or "Operation was not done") or freecad completely crashes.
> It seems that underlying libraries have serious problems with boolean
> operations on objects with common edges or faces - slight adjustment of
> object position leads to different (sometimes correct) result.
>
> I placed  simple examples - both generated and manually modified scripts
> (together with snapshot of results) in archive
> http://static.bastl.sk/pcb/freecad_examples.zip, so anybody can check them
> for mistakes (I am quite inexperienced with freecad). Any advice will be
> welcome.
>
> Milan
>



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