DD4hep Meeting October 2nd, 2025

Present:    Juan, Andre, Peter, Thomas

Apologies: Markus

Link to minutes of previous meeting

Merged PRs

• PR1497:  Increase tolerance of a test to avoid failures (Juan)

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.
• 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
• ISSUE1502: genStatus, reason and status question
  
  New:
• ISSUE1504: Link assignation of hits to status 2 particle

• ISSUE1505: Add warning message when exceeding Maximum Number Of Nodes in geoWebDisplay?

   

  Pending:
  

   

• PR1498:  Modernize code related to Surfaces and the SurfaceManager (Juan)
• 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)

Round Table

Juan:      

* Alma9 defaulting CMAKE_INSTALL_LIBDIR in lib64, not consistently used in DD4hep

Peter:     NTR

Thomas: 

* PR: Where to attach the FAST_SIM flag to MCParticles coming from the Geant4FastShowerModel?

AOB

Next meeting:   October 16th, 2025