Hi all, This is my first message on this list. I try to user therion with the linux version. I can generate a topo and a 3d model now with wiki help. But I have an issue with vertical and I don't find anything on the wiki or the mailing list archive to solve it. I try to realise a topo with vertical and on all vertical I have a figure there are nothing to do here. I will try to explain my trouble: If I put -90° or +90° I have a new rectangle on the result if I try with -89° the rectangle disappear. With -90° see the result at this address http://i.imgur.com/AinzN.png survey main -title "Test cave" survey first centreline data normal from to length compass clino left right up down P0 0 0.00 0.00 0.00 0.60 0.30 0.00 1.00 0 1 10.50 70.00 -66.00 1.00 0.50 1.00 3.50 1 2 7.50 70.00 -90.00 0.30 1.00 3.00 0.00 2 3 1.15 70.00 0.00 0.30 1.10 0.00 0.50 3 4 2.30 70.00 -34.00 0.00 1.50 1.50 1.25 4 5 1.00 70.00 -90.00 0.30 1.30 6.25 0.00 5 6 2.90 70.00 -1.00 0.60 1.00 1.00 2.00 endcentreline endsurvey endsurvey The same with -89° data normal from to length compass clino left right up down P0 0 0.00 0.00 0.00 0.60 0.30 0.00 1.00 0 1 10.50 70.00 -66.00 1.00 0.50 1.00 3.50 1 2 7.50 70.00 -89.00 0.30 1.00 3.00 0.00 2 3 1.15 70.00 0.00 0.30 1.10 0.00 0.50 3 4 2.30 70.00 -34.00 0.00 1.50 1.50 1.25 4 5 1.00 70.00 -89.00 0.30 1.30 6.25 0.00 5 6 2.90 70.00 -1.00 0.60 1.00 1.00 2.00 endcentreline endsurvey endsurvey I don't know if it is clear or not, I'm sorry for my english. Do you have any idear on what is wrong or what I don't undestand ? Regards, Laurent