From: Brian Kidd (bkidd_at_u.washington.edu)
Date: Mon Sep 29 2008 - 11:27:39 CDT

hello vmd users,

i would like to calculate the distance between atoms in two different
periodic images. the basic code logic would look something like:

1. create image of starting molecule, say +X.
3. create atomselection of set in the image
3. create atomselection of set in original molecule
4. calculate distances between atoms in the two set

i noticed that there is a command called showperiodic. can i use this
command to create a tcl variable that is a new atomselection command
of a periodic image? if so, how would i do that? if not, is there a
way to do this in VMD?

i'm basically asking for help with steps 1 and 2 outlined above

thanks,
-brian