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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 May 21rst, 2026

Present:     Andre, Juan, Markus 

Apologies: Peter, Thomas


Link to minutes of previous meeting

Merged PRs

  • PR1625:         Fix bug: add offset for boundary in Segmentation (Fangyi Guo)
    ISSUE2024:   Bug in Segmentation::positionToBin with vector of bin boundariesbug (Fangyi Guo)
  • ISSUE1568:  Sim hits between two sensitive volumes?question (Fangyi Guo)
  • PR1627:       fix: correct off-by-one error in dd4hep::detail::update_hash64(std::string)  ()
  • PR1631:      Add a check to restore compatibility with Geant4 v10
    ISSUE1628: Geant4 v10 compatibilityquestion (Marco Cl.)
    PR1630:       CI: add LCG_101 with geant4 10.7

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)

Pending PR:

  • PR1240:   Add multithreading support to ddsim (Wouter) 

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

  • PR1598:   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)
  • PR1622:   Avoid triggering infinite recursion with DDG4 (Juan)

New:

  • ISSUE1633: Decouple DD4hep Readers/Writers into Separate Source and Injection/Build Stagesenhancement (Simon Gardner)
  • 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)
  • PR1634:   g4GraphicalScan: ddsim steering file; deal with timeout; improve messages (Daniel Jeans)

Round Table

Andre:            NTR
Juan:              PR1622 can be merged. Investigating building ACTS with new ROOT.
Markus:         NTR

Next meeting:   June 4th, 2026

There are minutes attached to this event. Show them.
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      Around the table