Dear Simon and Niklas, thank you for your quick replies! Ok, so it seems that the geometry overlaps might be the root to my segmentation violations then... The reason I checked the benchmark camera is just cause I ran another one as well, and thought that maybe there was some fault in that setup. When I found errors in the benchmark as well I got really confused... anyway, I will try and dig deeper into this and see how I can change the camera setup to avoid this. Hopefully this will enable me to run with no problems! =) Thank you for your valuable insight, and I'll let you know how it works out! Sincerely, Ida <div class="gmail_quote">Den 24 september 2009 10.58 skrev Simon Stute <<a href="mailto:gate.stute@gmail.com">gate.stute@gmail.com</a>>: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Hi Ida, I have never checked if there is any overlap in the benchmarkPET camera, but I know the Geant4 policy for overlapping volumes. They strickly say that the behaviour of the code in such cases is unknown, and that one must avoid making overlaps in volume geometry. I have also already experienced some overlaps (between phantom and shielding) and it always resulted in Seg Viol, until I found this overlap. So it could be that ! Good luck, Simon <div class="gmail_quote"> 2009/9/24 Ida Häggström <<a href="mailto:ida.haggstrom@radfys.umu.se" target="_blank">ida.haggstrom@radfys.umu.se</a>> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div><div></div><div class="h5"> Hello! I run a main macro in Gate where I have a camera, phantom, source etc described. I added the line "/geometry/test/recursive_test<div>" after I initialize the simulation in my main macro file, to check that the geometry setup is ok. I get some errors like: GeomTest Error: Overlapping daughter volumes The volumes module_P[10] and module_P[9], both daughters of volume head_P[0], appear to overlap at the following points in global coordinates: (list truncated)... .... GeomTest Error: Overshooting daughter volume The volume LSO_P[0] appears to extend outside the mother volume crystal_P[0] at the following points in global coordinates: (list truncated)... .... for different parts of my camera and phantom. Even when I comment out the phantom and just run the camera I get errors. I find this a bit weird since I've just copied the camera from the benchmarkPET straight off, no changes. Maybe these errors aren't important and can be ignored, I don't know. Can these cause segmentation violations and abort entire runs as I described in a previous post ("segmentation violation aborts my run")? Thanks! Ida </div> </div></div>_______________________________________________ Gate-users mailing list <a href="mailto:Gate-users@lists.healthgrid.org" target="_blank">Gate-users@lists.healthgrid.org</a> <a href="http://lists.healthgrid.org/mailman/listinfo/gate-users" target="_blank">http://lists.healthgrid.org/mailman/listinfo/gate-users</a> </blockquote></div> </blockquote></div>