VMD-L Mailing List

From: John Stone (johns_at_ks.uiuc.edu)
Date: Tue Oct 10 2017 - 16:09:24 CDT

Dallas,
  Do you have any other lights on (besides 0 and 1)? All lights that
are "on" have to have normalized directions in VMD 1.9.3, otherwise
the bug can/will occur.

Best,
  John Stone
  vmd_at_ks.uiuc.edu

On Wed, Oct 11, 2017 at 07:54:40AM +1100, Dallas Warren wrote:
> John,
>
> Using those light settings with 1.9.3 eliminated the shadow stuttering
> and jagged edges in the shadows from the licorice representations. It
> did introduce a stutter though in the atom part of the licorice
> representation.
>
> I'll download and install 1.9.4 alpha and see how it goes.
> Catch ya,
>
> Dr. Dallas Warren
> Drug Delivery, Disposition and Dynamics
> Monash Institute of Pharmaceutical Sciences, Monash University
> 381 Royal Parade, Parkville VIC 3052
> dallas.warren_at_monash.edu
> ---------------------------------
> When the only tool you own is a hammer, every problem begins to resemble a nail.
>
>
> On 10 October 2017 at 14:17, John Stone <johns_at_ks.uiuc.edu> wrote:
> > Dallas,
> > Try running the publicly posted VMD 1.9.4 alpha instead,
> > and see if it occurs there or not. I fixed a bug that affected VMD 1.9.3
> > where a non-normalized light direction would cause problems in the OptiX
> > renderer. You could also do this in VMD 1.9.3 and see if it cures the problem
> > (assuming you're just using lights 0 and 1):
> > light 0 pos {0 0 1}
> > light 1 pos {0.435 0.869 0.217}
> >
> > Those are both unit-length light directions that should avoid triggering
> > the bug that I had in the OptiX renderer in VMD 1.9.3. In VMD 1.9.4 alpha
> > and later, the problem is fixed internally and it doesn't matter.
> >
> > Best,
> > John Stone
> > vmd_at_ks.uiuc.edu
> >
> >
> > On Tue, Oct 10, 2017 at 12:43:57PM +1100, Dallas Warren wrote:
> >> Generating a y-axis rotation animation, using Movie Generator with
> >> TachyonL-Optix renderer, 2D, standard projection, AO on.
> >>
> >> Between frames, the shadow generated by the overhead light source with
> >> the licorice representation and visible on a QuickSurf representation
> >> stutters and has the wrong appearence. It's jaggered at the points
> >> where the cylinder for the bond and the sphere for the atom join
> >> together in the shadow, almost like it is a low quality polygon rather
> >> than high one have used.
> >>
> >> Currently generating an animation using Internal Tachyon to see if it
> >> is there too, but that does take quite a bit longer to generate. Will
> >> reply as soon as have some details there.
> >>
> >> John, can send you a link to a file, privately, to show what is
> >> happening if required.
> >>
> >> Catch ya,
> >>
> >> Dr. Dallas Warren
> >> Drug Delivery, Disposition and Dynamics
> >> Monash Institute of Pharmaceutical Sciences, Monash University
> >> 381 Royal Parade, Parkville VIC 3052
> >> dallas.warren_at_monash.edu
> >> ---------------------------------
> >> When the only tool you own is a hammer, every problem begins to resemble a nail.
> >
> > --
> > 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/