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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 April 30th, 2026

Present:     Andre, Juan, Markus, Peter

Apologies: Thomas


Link to minutes of previous meeting

Merged PRs

  • PR1602:   feat: add Halton sequences support to isotrope generator (Wouter)

  • PR1578:   Don't use exceptions to test for the presence of an attribute.
  • PR1615:   Remove checks for nullptrs before deleting, since deleting is a no-op (Juan)
  • PR1618:   Protect the usage of NON-Geant4 properties against usage
            (and exceptions) when converting geometries to Geant4 (Markus)
  • PR1620:   Improve material properties. Introduce Geant4-custom properties (Markus)
  • PR1621:   Allow passing batch as runType for G4Gun and G4GPS (Juan)
  • PR1623:   DDSim: fix line length warning (Andre)

Closed PRs, closed issues and fixed problems

  • ISSUE1619: ddsim processes multiple input sources simultaneously (gun + external input) (Jan Eisermans ?) (closed by Andre)
                          ===> Request to change intentional feature

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)

    New pull requests:

  • PR1617:   Make EventSeeder run before primary generation (Andre)
  • PR1622:   Avoid triggering infinite recursion with DDG4 (Juan)
  • PR1625:   Fix bug: add offset for boundary in Segmentation (Fangyi Guo)
    ISSUE1568: Sim hits between two sensitive volumes?question (Fangyi Guo)
  • PR1626:  feat: add support for python geometry plugins

Round Table

Andre:            New tag for LHCb  v1r37
Juan:              Working on the multithreading branch from Wouter: all tests pass now locally
Markus:         NTR
Peter:             NTR

Next meeting:   May 21rst, 2026

 

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