From: John Stone (
Date: Fri Nov 21 2003 - 17:51:02 CST

  Any new news about this? I probably have time to build you one more
test binary before VMD 1.8.2 is basically done, so if you have any
ideas on something else I could try to cure this, let me know.

  John Stone

On Thu, Nov 13, 2003 at 04:51:13PM +0100, Lars Bruno Hansen wrote:
> John Stone wrote:
> >Lars,
> > Interesting, looks like some sort of Evil occured inside of Python/VTK
> >once it started up. The only change I made to VMD was to add a bit of
> >state tracking code and force it to call glXMakeCurrent() right before
> >it executes any OpenGL commands. I'm wondering if VTK lacks its own
> >matching calls and is seg faulting because it is then accessing VMD's
> >OpenGL state (textures, vertex arrays, various things that could annihilate
> >and unsuspecting OpenGL program...)
> >
> >Do you know if this Python VTK module has been made to get along with any
> >other OpenGL code besides VMD? Its possible that BOTH VMD and VTK would
> >require modifications to get them to work together in concert. While I can
> >easily make VMD more mindful of its own OpenGL state, I'm not sure what to
> >suggest if the crash is occuring inside of VTK or Python.
> >
> >In order to track the lost console messages you mentioned, try doing this
> >when you run VMD next time:
> > source /usr/local/bin/vmd (starts up as usual)
> > quit (quit that VMD, just needed the env settings
> > for the next run)
> > /usr/local/lib/vmd/vmd_LINUX
> >
> >Once you start it manually as shown, rather than starting a separate xterm
> >for the VMD console, you'll get all of the VMD output in the window you
> >run that command from, so that when you re-test VTK and the crash occurs,
> >you'll be able to see what console messages were printed. Give that a try
> >and let me know what happens.
> >
> >
> Dear John
> Thanks, using this I get:
> Fatal Python error: PyEval_RestoreThread: NULL tstate
> Abort (core dumped)
> I am not sure if the VTK module are designed to run with another OpenGL
> session, I have been searching for this information, but have failed
> to find anything.
> VTK is running in a tkinter window. You can open several of these
> windows from the same python session, but I am not sure if this imply that
> another OpenGL session can run in the same thread,
> with best regards
> Lars
> --
> Lars Bruno Hansen,
> CAMP, Dept. of Physics, Building 307, DTU, DK-2800 Lyngby, Denmark
> Phone: +45 45 25 32 16 Fax: +45 45 93 23 99
> E-mail:

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