From: John Stone (
Date: Thu Jul 21 2016 - 15:31:05 CDT

  I wonder how you ended up getting a degenerate cylinder.
What graphical representations were you using in VMD?
Unless you expect to do something particularly unique with POV-Ray,
I would suggest that you try using one of the built-in Tachyon renderers
since they work very well on the Mac and they won't yield this particular
kind of issue like POV-Ray does with its particular ASCII scene format.
If you feel it is important to you to use POV-Ray, I can give you
some workarounds you can try if you're going to combine geometry from
VMD with other POV-Ray geometry for a specific kind of outcome.

  John Stone

On Thu, Jul 21, 2016 at 08:04:24PM +0000, Irem Altan wrote:
> Hi,
> I'm working on Mac OSX 10.11.5 and VMD 1.9.7. I'm trying to use POV-ray to
> render a scene. I found out that pov-ray 3.6 is not compatible with the
> newer macs, so I installed (unofficial) 3.7 from this
> link: [1] .
> I then proceed to render the scene in VMD, which gives the following
> error:
> ==== [Parsing...]
> ==========================================================
> File '/Users/irem/Desktop/desktop/untitled' line 37: Possible Parse Error:
> Degenerate cylinder, base point = apex point.
> Fatal error in parser: Uncategorized error.
> ==== [Done] ==============================================================
> Render failed
> Is it because I specifically need version 3.6? If so, what other (free,
> mac-compatible) renderer can I use? Or can I just save the .pov file to
> render it elsewhere?
> Best,
> Irem
> References
> Visible links
> 1.

NIH Center for Macromolecular Modeling and Bioinformatics
Beckman Institute for Advanced Science and Technology
University of Illinois, 405 N. Mathews Ave, Urbana, IL 61801           Phone: 217-244-3349