From: Vermaas, Josh (
Date: Mon Jan 18 2021 - 08:41:44 CST

My understanding of the tachyon renderer is that it generates an input file for tachyon, which can then be run totally independently from VMD. It is an important distinction if VMD is failing to write the input file, or if tachyon is failing to render the input file. What happens if you use TachyonInternal? Then you don’t have to do the handoff. I’ve also had issues in the past when I rendered from a script, as sometimes elements from a .vmdrc are run after the script itself is, which would lead to things looking different than how you expected (including black screens).


From: <> on behalf of Soumik Ghosh <>
Date: Sunday, January 17, 2021 at 12:53 PM
To: "" <>
Subject: vmd-l: Tachyon sometimes suddenly freezes up when rendering epotential images


I have been trying to create Tachyon eoptential figures using vmd. When I render it manually via the GUI it works, but when I try to render these figures via a script, sometimes the rendering gets stuck at some % completion. it results in incomplete rendered pictures and sometimes I have to manually kill it. Can you please help? Following is the script I use.
display depthcue off
display projection Orthographic

mol addfile epotential.dx type dx first 0 last -1 step 1 filebonds 1 autobonds 1 waitfor all
mol addfile density.dx type dx first 0 last -1 step 1 filebonds 1 autobonds 1 waitfor all

mol delrep 0 top
mol representation Isosurface 0.000100 1 0 0 1 1
mol color Volume 0
mol selection {all}
mol material Opaque
mol addrep top
mol selupdate 0 top 0
mol colupdate 0 top 0
mol scaleminmax top 0 -0.080000 0.080000
mol smoothrep top 0 0

display resetview
scale by 0.7
drawframes top 0 {0:2}
color Display Background white
axes location Off
material change specular Transparent 0.220000
material change shininess Transparent 0.660000
material change opacity Transparent 0.300000

render Tachyon VMDscene.dat "/usr/bin/tachyon" -aasamples 12 %s -format TARGA -o %s_rot0.tga
rotate {x} by 90
render Tachyon VMDscene.dat "/usr/bin/tachyon" -aasamples 12 %s -format TARGA -o %s_rotx.tga
rotate {x} by -90
rotate {y} by 90
render Tachyon VMDscene.dat "/usr/bin/tachyon" -aasamples 12 %s -format TARGA -o %s_roty.tga

Thanking you in advance,
Soumik Ghosh

Soumik Ghosh
Marie Skłodowska-Curie Fellow
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