From: Norman Geist (
Date: Wed Mar 30 2016 - 03:57:05 CDT

If your system contains a lot of water, you might want to have a look at the catdcd tool to write a trajectory containing only your atomselection, so you might be able to load it at once to VMD. Away from that, you could write a TCL script which loads frame after frame and renders the image. Later you can combine all the images to a movie file. The movie maker in fact, follows the same procedure but instead has all frames loaded already.


Norman Geist


Von: [] Im Auftrag von Monika Madhavi
Gesendet: Mittwoch, 30. März 2016 04:43
Betreff: vmd-l: making a movie of a atomselection of a very large trajectory


Dear all,

I have a very large trajectory file (about 40 GB) so that I can't load it at once on vmd. I want to make an atomselection, update it every frame and I want to play the motion of atoms in this atomselection. I wrote a pdb file which contains the atomselection in each frame using "animate". Can I use the same command to play the trajectory of these selected molecules only? The examples I found talk about loading the trajectory at once and then make atomselections so if you can give me any suggestions it is greatly appreciated.

Thank you.


W.A.Monika Madhavi
Lecturer (Probation),
Department of Physics,
University of Colombo.