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Hello Brandon, We don't store the full trajectory for each track. For the trackers, we store the intersection of the propagated track with the sensitive volume surface. If your surface corresponds to one of these sensitive layers, then the information you need is there in the hit. If your surface is nearby you are probably OK if you propagate using a helix from the closest hit position. Please let me know if you need any more details. Norman > -----Original Message----- > From: Brandon Drummond [mailto:[log in to unmask]] > Sent: Tuesday, December 16, 2003 1:10 PM > To: lcd-sim > Subject: Fiducial surface > > > Hello, > I'm trying to find points along a particles path so I > can decide when it has crossed a particular surface. I need > the true path of the particle as generated by gismo or > geant4. Does anyone know how to get at this information? >