<html><head><meta http-equiv=Content-Type content="text/html; charset=Windows-1252"><META name="Author" content="Novell GroupWise WebAccess"></head><body style='font-family: Tahoma, sans-serif; font-size: 13px; '>Hello David, The default position of the viewer is: /vis/viewer/set/viewpointThetaPhi 0 0 /vis/viewer/panTo 0.0 0.0 You can get a better view of what's going on by changing these values. As for the cone, try something like: /gate/source/mybeam/gps/ang/mintheta 67.5 deg /gate/source/mybeam/gps/ang/maxtheta 112.5 deg /gate/source/mybeam/gps/ang/minphi 157.5 deg /gate/source/mybeam/gps/ang/maxphi 202.5 deg That should restrict your source to a 45 deg cone shape in the x direction. Cheers, Devin Van Elburg ------------------------- Physics w/ c/ Biomedical Physics Lakehead University >>> David Mills <d.mills@qmul.ac.uk> 06/10/15 10:09 AM >>> Hello, I’m still getting to grips with Gate, but I’m having trouble wrapping my head around the geometry. I want to have a point source stuck to one wall of my mainbox, sending a cone shaped beam of gamma particles towards a thin filter. Cone angle of 45 degrees. I think what I’ve got is a beam pointing out along the +Z direction instead. Is there any interactive way to drag the volume around in the viewer to see the different planes? This is what I have so far, any advice would be gladly received. ~~~~~~ # World /gate/world/geometry/setXLength 0.75 m /gate/world/geometry/setYLength 0.75 m /gate/world/geometry/setZLength 0.75 m /gate/world/setMaterial Air # Global Box /gate/world/daughters/name mainbox /gate/world/daughters/insert box /gate/mainbox/geometry/setXLength 0.5 m /gate/mainbox/geometry/setYLength 0.5 m /gate/mainbox/geometry/setZLength 0.5 m /gate/mainbox/placement/setTranslation 0 0 0 cm /gate/mainbox/setMaterial Air /gate/mainbox/vis/setVisible 1 /gate/mainbox/vis/setColor blue # Filter /gate/mainbox/daughters/name alu_slice /gate/mainbox/daughters/insert box /gate/alu_slice/geometry/setXLength 0.5 mm /gate/alu_slice/geometry/setYLength 0.5 m /gate/alu_slice/geometry/setZLength 0.5 m /gate/alu_slice/placement/setTranslation -0.125 0 0 m /gate/alu_slice/setMaterial Aluminium /gate/alu_slice/vis/setVisible 1 /gate/alu_slice/vis/setColor red # source /gate/source/addSource mybeam gps /gate/source/mybeam/gps/particle gamma ###spectrum stuff removed for brevity /gate/source/mybeam/gps/position -0.25 0 0 m /gate/source/mybeam/gps/type Point /gate/source/mybeam/gps/ang/type iso /gate/source/mybeam/gps/ang/mintheta 89 deg /gate/source/mybeam/gps/ang/maxtheta 91 deg /gate/source/mybeam/gps/ang/minphi 45 deg /gate/source/mybeam/gps/ang/maxphi 135 deg Regards, David -- Dr. David Mills Queen Mary, University of London Dental Biophysics Section Oral Growth and Development Institute of Dentistry Francis Bancroft Building London E1 4NS UK 020 7882 5978 07904 121783 skype : webshed _______________________________________________ Gate-users mailing list Gate-users@lists.opengatecollaboration.org http://lists.opengatecollaboration.org/mailman/listinfo/gate-users </body></html>