Re: [Pyode-user] Error in the PyODE tutorial

[Ethan Glasser-C. <gl...@cs...>]

Forgot to send this to the list; sorry Samuel Mankins for the
duplicate mail..

Samuel Mankins wrote:
> Traceback (most recent call last):
>   File "pyodestuff.py", line 3, in <module>
>     import ode
>   File "build/bdist.macosx-10.3-fat/egg/ode.py", line 7, in <module>
>   File "build/bdist.macosx-10.3-fat/egg/ode.py", line 6, in __bootstrap__
> ImportError: 
> dlopen(/Users/.../.python-eggs/PyODE-1.2.0-py2.5-macosx-10.3-fat.egg-tmp/ode.so, 
> 2): Symbol not found: _dMassSetCappedCylinder
>   Referenced from: 
> /Users/.../.python-eggs/PyODE-1.2.0-py2.5-macosx-10.3-fat.egg-tmp/ode.so
>   Expected in: dynamic lookup

That's pretty interesting. It looks to me like compatibility with the
old dMassSetCappedCylinder function names is provided by ODE 0.8 using
a #define in mass.h:

#define dMassSetCappedCylinder dMassSetCapsule
#define dMassSetCappedCylinderTotal dMassSetCapsuleTotal

Pyrex should have compiled to C and used these definitions. I have to
say I'm not familiar enough with Pyrex to understand what's going on.

Attached is a patch which ought to move PyODE to the new "Capsule"
names from the old CappedCylinder names -- this had been done with the
Geom functions but I forgot to do the Mass functions. You could apply
this and try to rebuild; I don't know if that would help or not.

One other thought -- I see that you say you're running Mac OSX 10.4,
but the filenames above say 10.3. Might there be a collision between
two different versions of ODE? I really don't think this is what's
going on either, but I thought I'd demonstrate my ignorance of OSX for
your amusement.

Ethan