I am writing a program to describe an array of segmented germanium detectors. The "physical" detectors are generated as unsegmented and the actual segment number is obtained using a readout geometry. I noticed that often an interaction point is assigned to the wrong segment, or that it is assigned to a segment even if it is clearly outside all of them. I have checked with a very simple program (which I can give to anyone who would like to check) that there is the same problem even with a very simple physical/readout geometry. Most of these points with mistake are quite far from the segment border (a few mm, which should be far larger than the tolerances). With the test program, I have used versions 4.5.2.p02 and 4.6.0
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The user examined the readout volume with the position of PostStepPoint. G4TouchableHistory of ReadOutGeometry corresponds to the position of PreStepPoint. Given readout geometry is a virtual and artificial geometry which does not affect to the Geant4 tracking, boudary of readout geometry does not limit a step. Thus, PostStepPoint may not belong to the volume of readout geometry where PreStepPoint belongs to.
