Hello, I have a problem with the « extend » command (survey file/centerline) for extended survey. On the scrap pinee6a1_cd.th2, I do the drawing from left to right, and I use this drawing to do my th2 file. But for the elevation survey, I would like to have it from right to left (so a mirror right-left for the drawing. If I use the command “exended reverse” on my survey file (pinee6.th, first centreline bloc), the drawing is reverse up-down : my survey have a rotation of 180° instead of a mirror reverse right-left. Do you have the probleme ? what should I do ? And in the 3D model (lox file), il size of the galerie seems strange. As if the size (up/down) is count twice. Look for the pinee6b.th2. The final room (at the top) seems to be mirrored (the floor is bad). Thanks, Gilbert PS : This command works on the pinee6b_cd.th2 file but, with the same rotation effect if we comment the line on the pinee6.th file. Try it. If you want more exemples (sources) I can send them to you