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DD4hep Developers Meeting

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Andre Sailer (CERN), Markus Frank (CERN)
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Please Join DD4hep developer's meeting via Zoom

DD4hep Developers Meeting
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68917133930
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Andre Sailer
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DD4hep Meeting June 4th, 2026

Present:     Juan, Markus 

Apologies: Andre, Peter, Thomas


Link to minutes of previous meeting

Merged PRs

  • PR1622:   Avoid triggering infinite recursion with DDG4 (Juan)
  • PR1634:   g4GraphicalScan: ddsim steering file; deal with timeout; improve messages (Daniel Jeans)

Closed PRs, closed issues and fixed problems

Pending Problems

  • ISSUE1297:  Possible to dump all available readout elements?
                          ==> Possibly a copy of unsolved ISSUE580 from Valentin about enumerating all sensitive cells.
  • ISSUE1335:   Uniform random picking of points on detector surfaces for noise studies
                           This problem is linked to #1297 and #580.
  • ISSUE1458: XML file vs TGeoStored geometry in GenFit
  • ISSUE1501: Bug/Feature: Condense duplicated particle contributions in calorimeter question
  • ISSUE1535: How to add new output variables in Hitsquestion (matclim -> DD4SHip)
                          ===> Debugging ongoing
  • ISSUE1568: Sim hits between two sensitive volumes (Alexander Tuna)
  • ISSUE1604: Question about random seed reproducibility when detector XML is modifiedquestion (Dr.Stubborn/Jiashen Luo)
  • ISSUE1633: Decouple DD4hep Readers/Writers into Separate Source and Injection/Build Stagesenhancement (Simon Gardner)

Pending PR:

  • PR1240:   Add multithreading support to ddsim (Wouter) 

  • PR1587:   Fields/FieldTypes: performance related cleanups (David Lange)

  • PR1590:   Fix more memory leaks (Juan)

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

  • PR1617:   Make EventSeeder run before primary generation (Andre)
  • PR1626:   feat: add support for python geometry plugins  (Wouter)
  • PR1629:   Refactor Geant4Output2ROOT (Juan)
  • PR1632:   feat: add DD4HEP_GENERATE_ROOTMAP_EXTRA_ENV hook to dd4hep_generate_rootmap (Wouter)

New:

  • ISSUE1635: ddsim crashes when given a particle outside world volumebug (Andre)
  • PR1636:   fix: honor G4OpticalParameters process activation flags in DDG4 (Wouter)
  • PR1638:   Include type unsigned long long for macOS in GrammarTypes (Maxwell Cui)
    ISSUE1637: Missing registration of unsigned long long for macOSbug (Maxwell Cui)
  • PR1639:   Bump actions/checkout from 6.0.2 to 6.0.3 dependencies github_actions (guthub-bot)

Round Table

Juan:              NTR
Markus:         Question: Is there anything needed to finish the multi-threading of ddsim/DDG4.
                        Answer from Juan: no. PR will be merged and more extensive tests performed.

Next meeting:   June 18th, 2026

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      Around the table