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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 16th, 2026

Present:     Andre, Juan, Markus, Peter, Thomas

Apologies: 


Link to minutes of previous meeting

Merged PRs

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

  • PR1605:  Fix undefined behaviour in the BitFieldCoder (Juan)
             ===> int vs. long issue

  • PR1607:  Update the checkout action since v4 uses a deprecated version of node (Juan)

  • PR1608:  Use subdetector-specific VolumeManager to avoid ambiguities. (Scott Snyder)

  • PR1609:  Fix typo in error message. (Scott Snyder)

  • PR1610:  Fix for building with CMAKE_INSTALL_MODE=ABS_SYMLINK. (Scott Snyder)

  • PR1611:  Change DetectorSelector to take a const reference. (Scott Snyder)

  • PR1612:  Bump actions/upload-artifact from 4 to 7 (BOT)

  • PR1613:  Bump cvmfs-contrib/github-action-cvmfs from 4 to 5  (BOT)

  • PR1614:  Bump aidasoft/run-lcg-view from 3 to 6 (BOT)
  • PR1616:   tweaks for not running depandabot on push, using hashes for action versions

Closed PRs, closed issues and fixed problems

  • None

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)

  • PR1615:   Remove checks for nullptrs before deleting, since deleting is a no-op (Juan)

Round Table

Andre:            See comment to old issue for pre-assigned decays from Alvaro (See ISSUE1543).
Juan:              Plan is to add sanitizers runs to release procedure to key4geo.
Markus:         NTR
Peter:             NTR
Thomas:        NTR

AOB

Next meeting:   April 30th, 2026

There are minutes attached to this event. Show them.
    • 3:30 PM → 3:50 PM
      Around the table 20m