[ODE] Fwd: Re: [Pyode-user] XODE

[brett hartshorn]

Hello ODE Users,

We have a question about the new XODE standard that perhaps someone could help clarify.  It seems
that the XODE spec allows for geom elements without a shape.  But how should the parser handle a
geom without a shape since ODE geoms always require shapes?  Please read the forwarded message
below.

-brett

--- Bernie Roehl <broehl at ecemail.uwaterloo.ca> wrote:
> To: Timothy Stranex <timothy at stranex.com>,pyode-user at lists.sourceforge.net
> From: Bernie Roehl <broehl at ecemail.uwaterloo.ca>
> Subject: Re: [Pyode-user] XODE
> Date: Sat, 26 Jun 2004 11:20:33 -0400
> 
> I was about to start doing this myself.   :-)
> 
> I notice you're using a SAX-based parsers, which is what I was planning to do.
> 
> However, there is a complication.  The XODE spec (thank you to whoever sent
> me the URL -- much appreciated) allows <geom> elements to exist with no
> indication of what shape they are.  This makes things needlessly complex,
> since in ODE one cannot create a geom without knowing what shape it is,
> so one has to keep track of all kinds of information about the geom in the
> XODE parser before encountering the <box> or <sphere> or whatever node
> gives its shape.
> 
> This is a serious enough issue that I would propose that we contact the XODE
> folks and ask them to change to using <geomBox>, <geomSphere>, etc,
> or having a mandatory "shape" attribute on <geom>.  They already seem to make
> reference to such a shape attribute, but it doesn't appear to be mandatory.
> 
> I think the <geomBox> (etc) approach is much cleaner, since there is then
> a more direct correpsondence between the element tags and the ODE objects.
> It also means that different elements can have different attributes (e.g. a 
> geomSphere
> would have a radius attribute).
> 
> I'm going to be very busy starting (checking my watch... now!), so would 
> someone
> here who has been following the XODE work be able to pass along that 
> suggestion,
> assuming you agree with it?
> 
> 
> 
> At 08:42 PM 6/25/2004 +0200, Timothy Stranex wrote:
> >Hey,
> >
> >I've checked the XODE specification and I think it should be implemented
> >in pure Python. I started writing an importer today using the
> >xml.parsers.expat module. It's very incomplete with just basic skeleton
> >code (I have not even bothered trying to test it yet) but I would like
> >to hear your comments on the interface.
> >
> >The code is attached as xode.py.
> >
> >--
> >Timothy Stranex <timothy at stranex.com>
> >
> 
> --
>    Bernie Roehl
>    University of Waterloo Dept of Electrical and Computer Engineering
>    Mail: broehl at ecemail.uwaterloo.ca   Voice: (519) 888-4567 x 2607 [work]
>    URL: http://ece.uwaterloo.ca/~broehl 
> 
> 
> 
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