VMD-L Mailing List

From: Warren L. DeLano (warren_at_delanoscientific.com)
Date: Wed Apr 30 2003 - 15:08:19 CDT

Darn,
        
        I'm having the same trouble -- looks like this may be a general
failing of the 750XGL card, independent of the application.

        After studying this for a while, it seems like there is some
sort of harmonic strobing between the stereo page flipping and the
vertical blanking interval of the monitor. Hmm...

Warren 

--
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Warren L. DeLano, Ph.D. 
Principal
DeLano Scientific LLC
Voice (650)-346-1154 
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-----Original Message-----
From: owner-vmd-l_at_ks.uiuc.edu [mailto:owner-vmd-l_at_ks.uiuc.edu] On Behalf
Of Marc Baaden
Sent: Wednesday, April 30, 2003 12:44 AM
To: Michael Redmond
Cc: vmd-l_at_ks.uiuc.edu
Subject: Re: Some comments about stereo with nvidia cards & shutter
glasses 
Hi,
I do also see something that corresponds quite well to your description
of an occasional "glitch". It is very annoying, and it is like you swap
from a mode with fine stereo to a mode where left and right eye are not
properly represented and you cannot see real stereo.
I just wonder if that is a problem with
- nvidia driver
- stereo shutter / video driver synchronization
- VMD ( I guess not .. ? )
- high load on the machine
because for now it seems a lot more frequent when I run eg an IMD
simulation
on the same machine, eg when it is under high load.
Anybody else sees this ?
The annoying thing in my case is, once it has gone clear for a frame, it
does not immediately switch back to proper stereo. So you really can't
use it when this happens.
Marc
redmond_at_engr.wisc.edu said:
>> We just got our Stereo VMD working with Linux and Quadro 750XGL card.
>> It is  basically functional, but I am seeing the same types of
>> problems I saw  under Windows when using shutter glasses. It is very
>> infrequent, but there  will be an occasional "glitch" where both
>> lenses of the glasses go clear  for a frame (or maybe a few). I
>> haven't detected the image shearing that is  obvious with some Quadro
>> cards (particularly the 550XGL) on Windows since  the glitches are
>> infrequent. On Windows, we end up correcting the problem  with an odd
>> resync utility that EDimensional has available on their web  site.
>> There is no equivalent for Linux and I am not sure what it does,
>> though I expect it syncs the glasses to monitor refresh somehow. 
  Marc Baaden
-- 
 Dr. Marc Baaden  - Institut de Biologie Physico-Chimique, Paris
 mailto:baaden_at_smplinux.de      -      http://www.marc-baaden.de
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