VMD-L Mailing List

From: John Stone (johns_at_ks.uiuc.edu)
Date: Mon Oct 09 2017 - 22:17:24 CDT

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/