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From: Norman Geist (norman.geist_at_uni-greifswald.de)
Date: Tue Sep 15 2015 - 01:40:02 CDT
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If you want to align the frames using only translations you can move by the difference of the centers of mass. Measure fit will always rotate.
Norman Geist
-----Ursprüngliche Nachricht-----
Von: owner-vmd-l_at_ks.uiuc.edu [mailto:owner-vmd-l_at_ks.uiuc.edu] Im Auftrag von Simon Dürr
Gesendet: Montag, 14. September 2015 17:16
An: vmd-l_at_ks.uiuc.edu
Betreff: vmd-l: Align only translation not rotation
I'm using the following command to align one of the frames of my
simulation to frame 0 to better understand what the ILS tools
(ILS:shift_to_center) do.
I however run into a strange problem.
I do this:
set sel [atomselect top "protein and name CA"]
set molid [$sel molid]
set refid $molid
set ref [atomselect $refid [$sel text] frame 0]
set all [atomselect $molid all]
$sel frame 1
$all frame 1
set mat [measure fit $sel $ref]
set shift [lindex $mat 0 3]
lappend shift [lindex $mat 1 3]
lappend shift [lindex $mat 2 3]
$all moveby $shift
The command should carry out only the transformation part of the
alignment and omit the rotation. I therefore expect to see frame1
aligned on the frame0 with little differences due to rotation (the
frames are 1ns apart)
What I get instead is the protein aligned in the y-axis and frame X is
shifted on the x-z-plane about 5A away from the frame0.
Has anyone an idea why this happens?
Cheers,
Simon
- Next message: Nikhil Maroli: "New user encounter an error as follows ;please guide me :: Tutorial"
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- In reply to: Simon Dürr: "Align only translation not rotation"
- Next in thread: Ajasja Ljubetič: "Re: Align only translation not rotation"
- Reply: Ajasja Ljubetič: "Re: Align only translation not rotation"
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