Having issues passing a hepmc file with many different vertices

[reynier0611]

We created a synchrotron-radiation event generator using the available synchrotron-radiation single-photon events. That is, we go from single photons to full events that we can then use as a background source. The output of this event generator is a hepmc file composed with pyhempc (I don't have experience with it and the only example I can find of using pyhepmc is here: https://github.com/scikit-hep/pyhepmc/blob/main/tests/test_basic.py). See attached a sample output hepmc file with 3 events.

I then pass these events through GEANT in DD4HEP:

npsim --runType batch --numberOfEvents 3 --compactFile ${DETECTOR_PATH}/epic.xml --inputFiles /path/to/file.hepmc --outputFile /path/to/output.root

and when I inspect the output root file with hits, specifically MCParticles/MCParticles.vertex.x, y, or z, all vertices are at (0,0,0) whereas we expect these photons to come from different vertices (as indicated in the hepmc file).

Am I doing anything obviously wrong from what I described here?

out_int_window_100.0ns_nevents_3.hepmc.zip

[wdconinc]

@bspage912 This sounds familiar, doesn't it? I think we need to revisit our debugging of this issue from last December.

[reynier0611]

I also tried to emphasize that since I create these hepmc files "by hand" (Ok, using pyhempc) and don't have experience with it there's a chance the error is there

[reynier0611]

I'm following up on this issue. The problem persists. See attached a simple hepmc file (with which the problem can be reproduced) with a fake event in which we want a photon emerging from a vertex at (30,0,100) mm along the x axis with momentum p = (5,0,0) GeV/c. If this was doing what we expected, we would see hits in the z = 100 mm plane. However, we only see hits in the z = 0 plane. Can we file a ticket with Hepmc or DD4HEP developers? Can someone with hepmc experience help out?
out_transverse_photon_pid_22_status_4_1.hepmc.zip