Dear chimeras users and developers, I would like to translate and rotate a model according to the rotation and translation matrix given by a fitmap. More precisely : I fit model #2 in map #1 and save the corresponding translation and rotation matrix with the save command. Then, I want to turn and move a model #3 so that it has the same position and rotation as model #2 (each correspond to the same pdb file). However, I want to do this automatically, so I need to do it from the matrix that is saved in a .positions file, and not from the (axis, axis point, rotation angle and shift along axis) values given by fitmap, but from the Matrix rotation and translation values. So far, - I compute the axis of rotation and the angle from the rotation matrix given by fitmap models #2 inMap #1 - I turn #3 around this axis and angle, in coordinateSystems #1 - I apply the translation also measured by fitmap models #2 inMap #1 to #3 (with three calls of the move command, for each axis x,y,z) However, there is a small gap between model #2 and model #3, whereas both should be at the exact same position. Maybe this has to do with the rotation center that is used in fitMap, but it cannot be saved in a .positions file, and I don't know how to recover it from the matrix rotation and translation given by fitmap. Do you have any idea of what I'm doing wrong, or how I could place model #3 at the same exact position as model #2 from the .positions file of model #2, and by moving and rotating model #3 ? (What I want to do then is re-apply this same transformation to build a chain of the same protein) Thanks, Lar Lara KOEHLER Laboratoire de Physique Théorique et Modèles Statistiques Bureau L123 - Bâtiment 530 - Rue André Rivière 91400 Orsay [ http://www.universite-paris-saclay.fr/ | www.universite-paris-saclay.fr ]