VMD-L Mailing List

From: John Stone (johns_at_ks.uiuc.edu)
Date: Wed Apr 06 2016 - 19:19:16 CDT

Hi,
  It seems from the list below that you did not yet try setting VMD to
row-interleaved stereo while the TV is set to the normal display mode,
i.e. leaing the TV in a non-3D display mode and having VMD do all of the
stereo processing. I would recommend trying that combination rather than the
approach of things you tried up to this point. You will also want to make
sure that your GPUs are driving the TV in a so-called 4:4:4 color mode
where there is no chrominance downsampling, as that would interfere with
correct stereoscopic display. On the LG TVs you may also want to set the
TV to "video game" mode, so that it disables any post-processing
motion compensation filters that can smear out the row-interleaved
stereo that VMD generates.

Cheers,
  John Stone
  vmd_at_ks.uiuc.edu

On Wed, Apr 06, 2016 at 07:49:10PM +0000, Yoav Atsmon-Raz wrote:
> Hi John,
>
> Strangely part of my message was cut out from the original message so i'll post it now instead:
> ---------------------------------
> Our setup is as follows:
>
> GPUs: 2 X Nvidia Gefroce 980 Ti using the Nvidia 352.63 driver
> OS: Ubuntu 14.04
> The CPU/RAM is a X99 Workstation with a Xeon octocore and 32 GB of ram.
>
> Things we tried so far:
> 1) Swapping out HDMI cables;
> 2) removing SLI bridge
> 3) switching from Unity to XFCE4
> 4) reinstalling nvidia drivers
> 5) testing the 3d TV on its own 3d self test that worked great.
> 6) Trying to visualize the same molecule with Chimera (same problem).
>
> We're really at a loss for ideas here and are willing to try anything, so if anyone has a suggestion based on their own experience with passive 3d tvs, i'll be more then happy to hear about it.
>
> Thanks in advance, Yoav
> ---------------
>
>
> ________________________________________
> From: John Stone [johns_at_ks.uiuc.edu]
> Sent: Wednesday, April 06, 2016 1:31 PM
> To: Yoav Atsmon-Raz
> Cc: vmd-l_at_ks.uiuc.edu
> Subject: Re: vmd-l: setting up a 4k HD TV for passive stereoscopic 3d
>
> Hi,
> We will need more information to be able to help you out.
> In general, you have two major approaches for using passive
> stereo on a TV. One way is to depend on the GPU and its graphics
> driver to supply quad-buffered stereo, and drive the TV using
> an HDMI stereo 3-D signal and video mode. In that mode, you would
> tell VMD to use quad-buffered stereo in the Display | Stereo menu,
> and you might need to set the TV mode to enable 3-D display.
>
> The other way of getting stereo is to run the TV in a normal
> (non-stereo) display mode, and leave the GPU driver set with
> quad-buffered stereo off/disabled. In that mode, VMD would
> generate the stereo signal itself using row-interleaved
> OpenGL rasterization in software, and you will need to ensure
> the correct left/right eye mapping by turning on/off the stereo
> eye swap feature in the Display | Stereo menu if you move
> the OpenGL window around on the screen.
>
> If you can tell us more specifically exactly what steps you've
> taken we can give further guidance.
>
> Cheers,
> John Stone
> vmd_at_ks.uiuc.edu
>
>
> On Wed, Apr 06, 2016 at 06:45:49PM +0000, Yoav Atsmon-Raz wrote:
> > Greetings everyone, recently our research group has purchased an LG UF8500 4k HDTV that has passive spectroscopic 3d integrated into it and we are interested in using it to display proteins with VMD. We have used the stereo>rows option and while we do get a 3d image the protein appears as horizontal stacks that push out of the screen instead of a spheroid shape which we should be getting. We also tried every of the other options in the stereo menu, but neither one of them is giving us the right shape in terms of depth
> --
> 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/