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Re: gEDA-user: a different approach to 3D modeling
Hi all,
> -----Original Message-----
> From: geda-user-bounces@xxxxxxxxxxxxxx
> [mailto:geda-user-bounces@xxxxxxxxxxxxxx] On Behalf Of Armin Faltl
> Sent: Saturday, November 20, 2010 11:53 AM
> To: gEDA user mailing list
> Subject: Re: gEDA-user: a different approach to 3D modeling
>
> Patrick Doyle wrote:
> > On Thu, Nov 18, 2010 at 10:01 PM, kai-martin knaak
> <kmk@xxxxxxxxxxxxxxx> wrote:
> >
> >> Looks like there is no open 3D exchange format that fits
> the need of
> >> pcb:
> >>
> >> a) render a beautiful image of a populated board
> >>
> >> b) integrate pcb in a 3D work-flow to fit the board into
> some tight
> >> space.
> >>
> >> The existing formats are either limited to surfaces rather than
> >> objects (STL, VRML). This prevents efficient processing of
> the 3D geometry.
> >> Or they lack attributes for eye candy (IGES). Or they are overly
> >> complex and geared to completely different use cases (STEP)
> >>
> > Not knowing anything of which I speak (write?), would COLLADA
> >
> (https://collada.org/mediawiki/index.php/COLLADA_-_Digital_Asset_and_F
> > X_Exchange_Schema)
> > fit the bill?
> Reading
>
> https://collada.org/mediawiki/index.php/COLLADA_FAQ#What_is_COLLADA.3F
>
> I believe COLLADA is a format mainly concerned about DCC
> (digital content creation).
> It's probably very good at meshes, textures and some freeform
> surfaces, but I didn't see anything about geometric
> primitives like spheres, cylinders dimensions and layers.
> Don't confuse "rigid body" with "solid geometry".
> Maybe my view is to pessimistic, but one needs to read the
> spec to prove.
>
>
>
Just my thoughts on this matter:
The COLLADA FAQ says (amongst many other things):
Q: Are COLLADA documents included as part of games?
A: COLLADA is not designed to be used as a final game format.
COLLADA allows 3D content to be created in any 3D package, exported to
COLLADA format and edited with a variety of tools from different vendors.
Once the content is finalized, it is usually processed into whatever format
is most efficient for the game engine and hardware platform being used.
AFAICT, THE COLLADA format can transport 3D-data from A to many Bs.
3D data can either be a set of vertexes or primitives.
It does not solve the "primitives versus vertexes" discussion for us, that
is a decision the pcb dev/user community has to make, or just do both so the
user has a choice.
A pcb exporter (or plugin) will still have to generate this 3D data.
Do you take the blue pill or the red pill, Neo ?
For now I continue with the OpenSCAD route.
When and if this gets to work according to my expectations, as I hope it
will (there are some limitations that need be solved on the OpenSCAD side),
then maybe gEDA can get some leverage in the Makerbot and Reprap
communities.
There seems to a variety of encasings for pcbs made with them plastruders.
http://www.thingiverse.com/thing:4071
http://www.thingiverse.com/thing:3944
http://www.thingiverse.com/thing:3665
http://www.thingiverse.com/thing:3559
http://www.thingiverse.com/thing:3372
http://www.thingiverse.com/thing:3363
http://www.thingiverse.com/thing:2982 Printable RC filter redux (should have
been done with pcb)
http://www.thingiverse.com/thing:2360
http://www.thingiverse.com/thing:1904 Parametric QF Breakout Board (should
have been done with pcb)
http://www.thingiverse.com/thing:1716
Just my EUR 0.02
Kind regards,
Bert Timmerman
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