Dear all, I would like to represent as a volume the space that would be covered by a set of atoms that are bound by "torsionable" bonds when one systematically modifies those torsion angles. An example would be the side-chain of an amino acid; imagine I would like to have a glimpse of what part of the space could be occupied by that side-chain. As a first approximation I wouldn't care about clashes. I would appreciate if someone can point me to an existing way of obtaining such representation or to an algorithm that could be implemented within chimera (which I would be happy to share with other interested people; if I manage to code it, that's it!) Cheers, -- Miguel Architecture et Fonction des Macromolécules Biologiques (UMR6098) CNRS, Universités d'Aix-Marseille I & II Case 932, 163 Avenue de Luminy, 13288 Marseille cedex 9, France Tel: +33(0) 491 82 55 93 Fax: +33(0) 491 26 67 20 e-mail: miguel.ortiz-lombardia@afmb.univ-mrs.fr Web: http://www.pangea.org/mol/spip.php?rubrique2