From: John Stone (johns_at_ks.uiuc.edu)
Date: Thu Sep 26 2019 - 13:33:30 CDT

Norman,
  Thanks for the details. With the retirement of ORNL's Titan system and
Blue Waters following sometime soon, there aren't a lot of K20 GPUs
still in the field (remember they first came out in the 2011/2012 time
frame). I know there has been discussion of how much longer NVIDIA have
been planning to officially support first-generation Kepler hardware
(compute capability 3.0, 3.5) in OptiX, and I don't know how much testing
is still being done on K20-era GPUs. We still have a couple of K20 test
boards floating around here somewhere, and I've got a currently running
K80 (compute capability 3.7) test machine. Let me compare what happens
on my systems here with what you experience and I'll report back.

Best,
  John Stone
  vmd_at_ks.uiuc.edu

On Thu, Sep 26, 2019 at 10:14:48AM +0200, Geist, Norman wrote:
> Hey John,
>
> sorry for the late reply. Due to some movements going on, I currently only
> have my remote GPU system available running over VNC and VirtuaGL. These
> machines have two Tesla k20m and the driver version is 375.39
>
> As said before, the non interactive version works with the alpha channel
> output and the interactive renderer works with VMD-1.9.3 but not with
> 1.9.4 showing only a black screen and "empty" image, only seem to contain
> the transparent bg.
>
> Bests
> Norman Geist
>
> Am Donnerstag, den 19-09-2019 um 17:13 schrieb John Stone:
>
> Norman,
> Do you observe that behavior every time? It works fine for me and on
> all
> of the machines here in our lab, and it should also for everyone else,
> but maybe you've found a bug somehow. Which VMD build are you running,
> what GPU did you run it on, and what NVIDIA driver version does your
> machine have installed?
>
> Best,
> John Stone
> [1]vmd_at_ks.uiuc.edu
>
> On Thu, Sep 19, 2019 at 11:13:05AM +0200, Norman Geist wrote:
> > Hey John,
> >
> > very cool new feature with that alpha channel output. I immediately
> tried it
> > and it perfectly worked with the Tachyon Optix Internal, however it
> didn't
> > work tough with the Interactive renderer. The interactive rendering
> window
> > is just black and the resulting image only contains the alpha channel
> by the
> > looks of things.
> >
> > Bests
> > Norman Geis
> >
> > > -----Urspr√ľngliche Nachricht-----
> > > Von: [2]owner-namd-l_at_ks.uiuc.edu [mailto:owner-namd-l_at_ks.uiuc.edu]
> Im
> > > Auftrag von John Stone
> > > Gesendet: Mittwoch, 18. September 2019 17:19
> > > An: jiali wang <jialiwangnamd_at_gmail.com>
> > > Cc: [3]namd-l_at_ks.uiuc.edu
> > > Betreff: Re: vmd-l: Re: namd-l: Is there someway to render protein
> picture
> > > without background color?
> > >
> > > Hi,
> > > As I mentioned, this is a feature in the new test versions of VMD
> 1.9.4,
> > > so you'll need to download the new version to get both the support
> for
> > > alpha channel (transparency) and PNG image file format, both of
> which
> > > are required for this feature. Try one of the VMD 1.9.4 test builds
> and
> > > let us know if you need further help.
> > >
> > > Best,
> > > John Stone
> > > [4]vmd_at_ks.uiuc.edu
> > >
> > >
> > > On Wed, Sep 18, 2019 at 11:14:28AM -0400, jiali wang wrote:
> > > > Dear John,
> > > > Thank you so much for your reply. I am using ubuntu system with
> VMD
> > > > 1.93.√* I am trying to use TCL console to type the command you
> > provided.
> > > > it's says:
> > > > Info) Rendering current scene to 'alphachannel.png' ...
> > > > ERROR) Unrecognized image file extension, writing Targa file.
> > > > OptiXDisplayDevice) Total rendering time: 0.19 sec
> > > > Info) Rendering complete.
> > > > But, I found I can not open the output file. after I change the
> file
> > type
> > > > to TAG, I could open that, but it√* shows no transparent
> background
> > > > effect?
> > > > Do you know what happened??
> > > > thank you so much for your help!
> > > > best regards,
> > > > JIali
> > >
> > > --
> > > NIH Center for Macromolecular Modeling and Bioinformatics
> > > Beckman Institute for Advanced Science and Technology
> > > University of Illinois, 405 N. Mathews Ave, Urbana, IL 61801
> > > [5]http://www.ks.uiuc.edu/~johns/ Phone: 217-244-3349
> > > [6]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
> [7]http://www.ks.uiuc.edu/~johns/ Phone: 217-244-3349
> [8]http://www.ks.uiuc.edu/Research/vmd/
>
> References
>
> Visible links
> 1. mailto:vmd_at_ks.uiuc.edu
> 2. mailto:owner-namd-l_at_ks.uiuc.edu
> 3. mailto:namd-l_at_ks.uiuc.edu
> 4. mailto:vmd_at_ks.uiuc.edu
> 5. http://www.ks.uiuc.edu/~johns
> 6. http://www.ks.uiuc.edu/Research/vmd
> 7. http://www.ks.uiuc.edu/~johns
> 8. 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/