Hi all, I have a problem associating a vrml object an a molecule : Let's say I have an arrow created using the bild format to which I gave 0.0 0.0 0.0 coordinates. This arrow and the molecule translate/rotate together using the mouse. Now if I translate / rotate my molecule using the setcoord command on the atoms in a python script, the arrow won't follow up the molecule. I tried the addAssociatedModel command to link the arrow and the molecule but still the same result. How can I handle this? Thanks for your attention -- -------------------------------- 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 -------------------------------