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    DD4hep Developers Meeting

    → Europe/Zurich
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    Andre Sailer (CERN), Markus Frank (CERN)
    Description

    Please Join DD4hep developer's meeting via Zoom

    DD4hep Developers Meeting
    Zoom Meeting ID
    68917133930
    Host
    Andre Sailer
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    DD4hep Meeting October 22nd, 2026

    Present:      Andre, Juan, Markus, Peter

    Apologies:  Thomas


    Link to minutes of previous meeting

    Merged PRs

    • PR1663:  Geant4Output2EDM4hep: get run from worker context (Andre)
         ---> Access to context for run parameters
    • PR1676:  build(deps): bump cvmfs-contrib/github-action-cvmfs from 5.5 to 5.6dependenciesgithub_actions (BOT)
    • PR1678:  DDSim: outputconfig: fix example for multi-threaded running for user Addressing (Andre)
         ---> Protection to not use shared actions in single threaded mode
    • PR1680:  Use non-deprecated ROOT RVersion header (Juan)

    • PR1681:  DDCAD: remove CSG-based exporter (Juan)
         ---> For now no round trips with CAD volumes anymore 

    • PR1684:  Make vertex consistent for edm4hep reader and hepmc reader
         ---> Use end-vertex for beam particles vertex rather than start-vertex
    • PR1686:  Remove unused variable s_exit_handler_active (Juan)
    • PR1687:  Remove filesystem detection and require GCC 9.1+ (Juan)
         ---> std::file_system always present for gcc 9 and above
    • PR1688:  TestSteppingAction: don't suspend tracks that are already dead (Andre)
         ---> Check track status before suspending
    • PR1689:  correct edm4hep reader for new MDI synchrotron radiation file format (David Lange)
         ---> like PR1684, but for EDM4hepFileReader
    • PR1690:  Preserve state changes on hits when steps are filtered out (Tova Holmes)
        ---> optional processing hook when tracks get rejected
    • PR1691:  fix(HepMC3EventReader): apply the length unit to the primary vertex position (Joshua Beirer)
        ---> add units to event reader when creating vertices
    • PR1694:  CMake: require boost 1.70 so we are sure there is a BoostConfg.cmake file provided (Andre)
        ---> cmake improvement
    • PR1697:  CI: remove config for macOS11 jobs that haven't run in living memory (Andre)
    • PR1698:  Pass nMax to VolSurface::getLines in Surface::getLines (Juan)
         ---> DDRec protection
    • PR1699:  add symmetry=0 for barrel and endcap cylindrical surfaces (Giovanni Marchiori)
         ---> Generic improvement to CaloFaceBarrel/Endcap surfaces

    Closed PRs, closed issues and fixed problems

    • PR1685:  GaudiPluginService: find plugins on macOS when DYLD_LIBRARY_PATH is stripped (Federico Meloni)
    • ISSUE1677: Duplication in the events saved in the output file using ddsimbug (Andrea da Vita)
    • ISSUE1679: RPATH baked into DD4hep binaries overrides LD_LIBRARY_PATH, causing wrong-library loads of local key4hep buildbug
        ---> Closed as unplanned

    Pending Problems

    • ISSUE1335: Uniform random picking of points on detector surfaces for noise studies
                             This problem is linked to #1297 and #580.
    • ISSUE1458: Possible discrepancy between xml file and geometry converted into root file
    • ISSUE1501: Bug/Feature: Condense duplicated particle contributions in calorimeter question
    • ISSUE1568: Sim hits between two sensitive volumes (Alexander Tuna)
    • ISSUE1633: Decouple DD4hep Readers/Writers into Separate Source and Injection/Build Stagesenhancement (Simon Gardner)
    • ISSUE1643: Non-determinism in hit ordering when multiple detectors share readoutbug (Wouter)

    Pending PR:

    • PR1606:   feat: AdePT physics list plugin for e+/e-/gamma offload to GPU [WIP] (Wouter)

    • PR1626:  feat: add support for python geometry plugins (Wouter)
    • PR1658:   [DRAFT POC] Add Arrow IPC stream writer for EDM4hep output (Wouter)
              ---> What is arrow IPC
    • PR1664:   feat: honor DD4HEP_LIBRARY_PATH for plugin search (Wouter)
              ---> MacOS is non-trivial!

    Not so new:

    • ISSUE1657: DDG4 reduces the generator status to 16 bits and gives no warning (Marco Meyer-Conde)
         ---> What to do here ?
    • ISSUE1667: LCIO output not writing runParameters (Andre)
    • ISSUE1671: CI: replace macOS brew install with lcgcmake installenhancement (Andre)


    New:

    • ISSUE1683: Bug about the thickness in DiskTracker_geo.cppbug (Fangyi Guo)
    • ISSUE1693: Incorrect number of events saved to EOS when running with multithreading (IDEA o1 v4)bug (Andrea da Vita)

     

    • PR1672:  Add cvmfs/LCG-based macOS workflow (Wouter)
    • PR1682:  AssimpWriter: Drop need for rootcsg (Andre)
         ---> PR started, but still problems with assemblies. Problem was always present in rootcsg.
    • PR1692:  fix(Geant4InputHandling): start a tracked parent-less particle at its own production point (Joshua Beirer)
         ---> Does this not do the gun as well ?
    • PR1695:  Fix concurrent DDDigi container combining (Juan)
         ---> Missing locking caused crashes
    • PR1700:  Geant4Action: get event action by name without splitting. (Andre)

    • PR1701:  CI: build and test k4geo against DD4hep (Juan)

    • PR1702   fix(Geant4ParticleHandler): avoid duplicate track-equivalents map at end of event (Wouter)
         ---> memory saving mechanism

    Round Table

    Andre:            NTR
    Juan:              NTR
    Markus:         Possibility to create DD4hep descriptions from Geant3 implementations.
                           See presentation here. 
    Peter:             NTR

    Next meeting:   November 5th, 2026

    There are minutes attached to this event. Show them.
      • 15:30 → 15:50
        Around the table 20m