VMD-L Mailing List

From: John Stone (johns_at_ks.uiuc.edu)
Date: Wed Apr 09 2014 - 10:48:46 CDT

Carlos,
  The "jiggling" you see during movie rendering is normal and is
caused by VMD swapping the "front" and "back" OpenGL color buffers
when it takes the snapshot. The outcome you described however indicates
that you may have a broken graphics driver, as you should definitely
be getting the expected output in the files on disk. What NVIDIA
driver version is this machine running? I haven't seen this occur
on Linux and we have a Quadro 5800 in our lab as well, so this may
be a windows-specific driver issue for that card, or an issue with
that particular driver version. If you can tell me more about the
driver version that may be helpful.

Cheers,
  John Stone
  vmd_at_ks.uiuc.edu

On Wed, Apr 09, 2014 at 11:31:51AM -0400, Carlos Simmerling wrote:
> hi all,
> I'm having trouble making a movie in VMD. I've done this many times in the
> past, but not since I upgraded to 1.9.1. I also upgraded some of my
> hardware recently, so not sure which has caused this. I'm running windows
> 7 home premium on a quadro fx5800.
> The issue is that all of my visualization works fine, but when I try to
> use the movie maker (snapshot mode) it runs but produces incorrect output.
> it performs the operation (either rotate or traj), and appears to be
> making snapshots. I can see the molecule move, but after every step it
> also redraws the image like it was right when I started the movie. In
> other words, it moves forward, then back to the start, then to the next
> frame of the rotation or traj, then back to the start, then advances
> again, and so on. The actual image files saved to disk are all identical,
> and are all the original view. When I'm not making the movie things work
> fine and the dynamics are shown fine. It's only in the movie where it
> seems to draw the right frame, then snap back to the original one, which
> gets written to disk.
> any ideas?
> thanks!
> Carlos 

-- 
NIH Center for Macromolecular Modeling and Bioinformatics
Beckman Institute for Advanced Science and Technology
University of Illinois, 405 N. Mathews Ave, Urbana, IL 61801
http://www.ks.uiuc.edu/~johns/           Phone: 217-244-3349
http://www.ks.uiuc.edu/Research/vmd/