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.

    Tom

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