[Chimera-users] rotation centers

Benoit Zuber bzuber at mrc-lmb.cam.ac.uk
Wed Jan 26 07:17:54 PST 2011

Hi Tom,

Great, that worked nicely, thank you!

On 26/01/2011 02:36, Tom Goddard wrote:
> Hi Ben,
>   The "independent" center of rotation mode is not able to do what you 
> want without great difficulty.  It can only rotate each model about 
> its own geometric center with no provision to specify the center (it 
> is calculated).
>   But it is not too hard to get what you want.  You use the "turn" 
> command once for each pdb/map pair.  Suppose the first PDB is model #0 
> and its map is model #1.  Use the following command
>     turn z 3 120  center #1 models #0,1 coord #1
> to rotate both about the z axis of the map coordinate system in 3 
> degree steps for 120 steps about the geometric center of the map.  If 
> the next PDB/map pair is #2,#3 use the analogous command to rotate 
> those.  When you put those two commands in a script to record a movie 
> the first command completes immediately (it doesn't wait for the 120 
> frames) and so the second rotation will start at the same time 
> (actually one frame later, but that shouldn't be observable at 25 
> frames/sec).  Put the commands on the same line separated by a 
> semi-colon if you want them to strictly start exactly in sync (no 1 
> frame error).
> Turn command documentation:
>     http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/turn.html
>   Tom
>> Hi,
>> I have a set of density maps and PDB models. I have displayed the maps
>> side by side. Each map has a pdb model docked in it. I would like to
>> make a movie where each map rotates around its Z axis. Each pdb should
>> rotate around the Z axis of its respective map.
>> I tried:
>> set independent
>> roll z
>> The problem is that the center of the pdb models is not the same as the
>> center of their respective maps. Is there a way to group one pdb with
>> one map so that they rotate around the same center? Or is it possible to
>> set the center of rotation of a PDB to the same value as the center of
>> rotation of the map?
>> Thanks in advance
>> Ben

Benoît Zuber
MRC Laboratory of Molecular Biology
Hills Road
United Kingdom
+44 1223 402209
bzuber at mrc-lmb.cam.ac.uk

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