Dear Sirs, I am writing to ask for the chimera sources -- I would like to visualize a circular molecule using ribbons. As far as I can tell, with the current code ribbons always have ends (cannot be closed) because of the following snipped from libs/_chimera/Chimera.toolkit/Ribbon.implementation 696 Molecule::updateRibbonData() 697 { 698 clearRibbonData(); 699 700 // 701 // For each residue, find the residues before and after. 702 // Note that only residues with valid guide and plane atoms 703 // may be used as the prev/next residue in a ribbon. 704 // 705 std::map<Residue *, RibbonResidue> rrMap; 706 Residue *prev = NULL; ^^^^^^^^^^^^^^^^^^^^^ Could you please allow me to check out the svn version of the chimera or get (easily compilable) sources of a recent release. Thank you, Volodymyr