Hi Giuseppe, I've made the Chimera "measure inertia" command report the center of the ellipsoid in the Reply Log. The output looks like: Inertia axes for 3BQW.pdb v1 = -0.363 -0.271 -0.892 a = 39.714 r1 = 14.386 v2 = 0.853 -0.482 -0.200 b = 26.633 r2 = 19.507 v3 = 0.375 0.833 -0.406 c = 18.039 r3 = 21.385 center = 34.324 8.2127 2.4621 This will be in tomorrow's daily builds. Tom
Hi Tom,
thanks for the answer and sorry for the delay in the reply.
I tried to use the approach you suggested, but my main problems to identify the point where to put the vectors origin.
I hope you can help me
Thanks
giuseppe
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