VMD-L Mailing List

From: Carlos Simmerling (carlos.simmerling_at_gmail.com)
Date: Wed Apr 09 2014 - 11:41:42 CDT

thanks. and to clarify, it works fine when not in moviemaker.

On Wed, Apr 9, 2014 at 12:39 PM, John Stone <johns_at_ks.uiuc.edu> wrote:

> Carlos,
> Normally the buffer swap jiggles back and forth between the last frame
> and the next frame. The fact that you're only seeing the first frame
> there may indicate that someone has overoptimized the graphics driver and
> it
> is breaking the normal OpenGL buffer swap behavior. I'm traveling for
> the next two days and away from the office, but I'll revisit the code
> when I get a chance. You might consider downgrading to an older
> video driver and see if that cures the problem in the mean time.
>
> Cheers,
> John Stone
> vmd_at_ks.uiuc.edu
>
> On Wed, Apr 09, 2014 at 12:16:53PM -0400, Carlos Simmerling wrote:
> > Hi John,
> > thanks for the reply. My nvidia control panel says I have driver
> 332.50,
> > and no updates are available.
> > Is the buffer swap between consecutive frames, or should it be as I
> see,
> > alternating the initial frame with the one that is supposed to be
> written?
> > If it's buffer swap, then it seems to draw frame 1, then 2, then 1,
> then
> > 3, then 1 and so on, so that toward the end the structures that
> alternate
> > are completely different...
> > thanks!
> > carlos
> >
> > On Wed, Apr 9, 2014 at 11:48 AM, John Stone <johns_at_ks.uiuc.edu>
> wrote:
> >
> > 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/
>
> --
> 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/
>