Re: [Pyode-user] Initial (re)design questions

[brett h. <bha...@ya...>]

--- Timothy Stranex <ti...@st...> wrote:
> On Fri, 2004-06-25 at 09:28, Timothy Stranex wrote:
> > On Fri, 2004-06-25 at 02:31, brett hartshorn wrote:
> > > It would be nice to have some fast C functions that can convert ODE's dReals vertices to
> osg's
> > > Vec3 vertices and pass that object directly to an osg geode.  These functions could then be
> > > exposed to Python, then we would not have to do the conversion in Python using tuples as the
> > > middle-man.  It sounds like its going to be hard, any ideas?
> > 
> > A function capable of doing that would need to know the internal
> > structure of the Python Geode class and the C++ Geode class. To do that,
> > PyODE would have the added dependencies of both PyOSG and OSG.
> > 
> > I like Bernie's intermediate array module idea. PyOSG, Python-Ogre
> > bindings and PyODE will each need to implement an importer and exporter
> > from the internal types to the array object. Since the array module is
> > already part of Python, it isn't an extra dependency.
> 
> I just noticed this in Python's Extending/Embedding documentation:
> 
>     Python provides a special mechanism to pass C-level information
>     (pointers) from one extension module to another one: CObjects. A
>     CObject is a Python data type which stores a pointer (void *).
>     CObjects can only be created and accessed via their C API, but they
>     can be passed around like any other Python object. In particular,
>     they can be assigned to a name in an extension module's namespace.
>     Other extension modules can then import this module, retrieve the
>     value of this name, and then retrieve the pointer from the CObject.
> 
> The rest is at http://www.python.org/doc/2.3.3/ext/using-cobjects.html.
> 

looks like CObjects are the way to go.  The doc had a good example, it does not look like too much
of a hack.

-brett




		
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