DD4hep Developers Meeting

Thursday 16 Oct 2025, 15:30 → 16:00 Europe/Zurich

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Andre Sailer (CERN), Markus Frank (CERN)

Please Join DD4hep developer's meeting via Zoom

DD4hep Meeting October 16th, 2025

Present:     Andre, Markus

Apologies: Juan, Peter, Thomas

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Link to minutes of previous meeting

Merged PRs

• PR1499:  Add the pass-through of generator event information for EDM4hep (Thomas)

• PR1500:  Add a [[maybe_unused]] to prevent a warning in ConditionExampleObjects.cpp (Juan)

• PR1507:  Use CMAKE_INSTALL_LIBDIR (Juan)
• PR1508:  Fix two compiler warnings about an unqualified move and an unused var (Juan)
• PR1510:  Geant4VolumeManager: set message about bad paths that are insensitive… (Andre)
• PR1512:  Add an option for increasing the number of nodes in GeoWebDisplay and a warning (Juan)

Closed PRs, closed issues and fixed problems

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• PR1511:  Layered calorimeter data update
• PR1513:  Add the correct lib install dir to the plugin load path
• ISSUE1502: genStatus, reason and status question
• ISSUE1504: Link assignation of hits to status 2 particle
• ISSUE1505: Add warning message when exceeding Maximum Number Of Nodes in geoWebDisplay? (closed by alexandertuna)
• ISSUE1506: A lot of new output for TPC in k4geo

• ISSUE1509: Overriding magnetic field definition specified in example in steering file (closed by Andre)

Pending Problems

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• ISSUE1297:  Possible to dump all available readout elements?
                        ==> Possibly a copy of unsolved ISSUE580 from Valentin about enumerating all sensitive cells.
• ISSUE1320:  Replacing a Handle<Segmentation> which contains a MultiSegmentation with the underlying Segmentation
                        ==> Unclear what he really means.
• ISSUE1335:   Uniform random picking of points on detector surfaces for noise studies
                         This problem is linked to #1297 and #580.
• PR1240:        Add multithreading support to ddsim
• PR1314:        Cylinder segment surface (Armin Ilg)
• ISSUE1373:  Add GeneratorInfo to EDM4hepReader (Andre)
• ISSUE1443:  Make user particle handler extensible
                         ---> Maybe we should take advantage and re-collect requirements.
• ISSUE1458: XML file vs TGeoStored geometry in GenFit
• ISSUE1487: The test t_DDDigi_sim_test_weighted_deposit_overlay can fail (Juan)
    ---> Unstable test 
• ISSUE1489:  using SkinSurfacequestion
• ISSUE1492:  Readout segmentation for multiple cylinders with offset axes question
                        ----> Unclear code in CylindricalGridPhiZ.cpp line 80
                        ----> Try special case where axis is identical to beam axis.
• ISSUE1501: Bug/Feature: Condense duplicated particle contributions in calorimeter question
  
  New:

• 
  Pending:

• PR1498:  Modernize code related to Surfaces and the SurfaceManager (Juan)
• PR1503:  [WIP] Add flag for fast simulation to MCParticle

Round Table

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Andre:     New tag coming up soon. With new version of podio and edm4hep.
Markus:  NTR.

AOB

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Next meeting:   October 30th, 2025

1 Around the table