Hi Guiseppe, I guess you are using the Chimera "measure inertia" command to show an inertia ellipsoid for specific atoms. There is not an option to show the principal axes as arrows. I'll add that to our feature request list. But you can do it now by hand if it is worth going to that trouble. You would use Chimera BILD format to draw the axes as in the following mailing list message http://www.cgl.ucsf.edu/pipermail/chimera-users/2009-April/003762.html but you would use the axes that the measure inertia command reports in the reply log. Tom
Dear Chimera team, I am using Chimera to create ellipsoids from specific sets of atoms. The ellipsoids are shown in the graphic window as a surface model and information about each ellipsoid are given in the reply log. In it the ellipsoid vectors are reported among others info. I wonder if you have a command to show vectors defining the ellipsoid instead of the surface model in the graphic window. Thanks Regards giuseppe