Hi Bill, You can use the command "cofr" with specified atoms (including "sel" as the specification if the atom or atoms are selected). <http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/cofr.html> There are several different rotation modes, and you can switch among them using either "cofr" or the Rotation tool (under Tools... Movement in the menu). <http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/sideview.html#rotation> I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab Department of Pharmaceutical Chemistry University of California, San Francisco On Dec 29, 2010, at 3:55 PM, Bill Montfort wrote:
I'm returning to chimera after many years away and am quite impressed with the program, save for one issue: rotating about the screen center. My favorite way of viewing structures is for the rotation to be about a center of my choosing, as is common in many graphics programs (e.g. COOT). I would prefer to pick an atom on the screen and have this become the rotation center. Is there a simple way to accomplish this in chimera? A small point perhaps, but one that is frustrating for me.......
Bill Montfort