Hi all, I have a python script that allows me to rotate a residue in a molecule of a desired angle around a predefined vector. Now I'd like to be able to do this graphically with the mouse on a selected residue. I have almost found what I want if I use the 'Move selection' option in the 'Movement Mouse mode' but this does rotate around the center of Mass or geometric center, not around a vector. What I plan to do is derive the code from the corresponding /share/MoveSelection/move.py module and try to insert a vector instead of the center_of_rotation(self.movable_groups) but there is maybe a better, simpler idea. Any suggestion? Thanks a lot -- -------------------------------- Patrick Ladam Maître de Conférence Université Paris 13 - UFR SMBH CSPBAT - Service RMN 74, rue Marcel Cachin 93017 Bobigny Cedex Tel: 01 48 38 73 25 Fax: 01 48 38 77 77 mail: ladam@smbh.univ-paris13.fr -------------------------------