[Chimera-users] Calculating and showing the Mass center of Volume Segments

Tom Goddard goddard at sonic.net
Mon Nov 14 09:49:58 PST 2011

There isn't any Chimera command to identify the center of mass or a 
density map or place a marker/atom there.  But that seems useful.  A 
Python script can easily do it.  I'll see if I can give you a Python 
script at the end of today, or maybe add an operation to the Chimera 
"measure" command to do this job.


> Hello,
> I got a volume map that I segmented in 4 parts. Now I wanted to 
> measure how the parts are coordinated to each other. As the 
> Axes/Planes/Centroids menu can only create planes by atoms I wanted to 
> place atoms in the mass- center of each segment. Is there any way to 
> realize that?
> Or do you have any other way to measure the angles. To explain what 
> I'm trying to measure: Example you have 4 segments, I call them a b c 
> d. I want to measure how the axis that is formed by a and b, forms an 
> angle to c and d, or how ist he angle of the plane formed by a b and c 
> compared to ab and d . All for segments are basically the same objects 
> just turned and rotated.
> With best regards
> C. Schmidt

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