DD4hep Developers Meeting

Thursday 10 Apr 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 April 10th, 2025

Present:     A.Sailer, M.Frank, Peter McKneown

Apologies: A.Tolosa Delgado, T.Madlehner 

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Link to minutes of previous meeting

Merged PRs

• PR1428:  CMake: do not build DDEve if ROOT::Eve does not exist
• PR1429:  UtilityApps: move G__eve dictionary to when we have ROOT::Eve (Andre)
          ---> PR1428 and PR1429 follow ups of PR1426
• PR1432:  Clean up header includes
• PR1433: Geant4ParticleHandler: do not set vertex bit for particles that were not simulated
• PR1437: Geant4TVUserParticleHandler: fix wrong contains check through unit conversion
• PR1438: make timeout configurable in g4GraphicalScan
          ---> Improvement to avoid too long processing times
• PR1439: Fix, Optical physics option invokeSD require poststep info only

Closed issues and fixed problems

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• ISSUE1296:  DetectorImp::endDocument() called twice for some geometries?
                        ==> Unsure if it is a problem wrongly configuring multiple xml inputs.
           ---> No response since August 2024
• ISSUE1419: Assigning multiple sensitive volumes to a single readout Idquestion
• ISSUE1424: Error with ROOT::Eve when building DD4hep
• ISSUE1429:  Error with ROOT::Eve when building DD4hep
• ISSUE1430: How the signedness affects number of bits in the bitfield?
• ISSUE1434: Different behavior in Geant4 particle handlers (TC vs. TV)
          ---> Unit problem between mm (G4) and cm (TGeo)
• ISSUE1435: Make g4GraphicalScan internal timeouts configurable (See PR1438)
• ISSUE1436: interpreter information for class dd4hep::sim
          ---> Question what to load to process DDG4 ROOT files with bare ROOT
•  

Pending Problems

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• ISSUE1199: Persist hepmc vertex status code into output
                        ==> Should we eliminate Geant4EventReaderHepMC
                        ==> Decision: Geant4EventReaderHepMC will be removed
• ISSUE1285:  Memory Consumption of Sensitive Detectors
                        ==> Should be handled as illustrated in PR1288. Intrinsic problem of the Geant4VolumeManager;
• ISSUE1297:  Possible to dump all available readout elements?
                        ==> Possibly a copy of unsolved ISSUE580 from Valentin about enumerating all sensitive cells.
• ISSUE1319:  Problem with regexSensitiveDetector and volume IDs
                        ==> Interesting use case for reg-ex sensitive detectors
                               having a VolumeMgr equivalent.
• 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.
• ISSUE1373:  Add GeneratorInfo to EDM4hepReader (Andre)
  PR1371:        Read edm4hep (Andre)

• ISSUE1399:  ddsim: Vertices of tau and its decay product not matching the information in the input HEPMC file
                         ---> Apparently Geant4 problem. Andre has submitted a ticket.

• PR1240:       Add multithreading support to ddsim
• PR1304:       SurfaceManager: lazily construct surface maps on demand (Leonhard Reichenbach)
• PR1314:       Cylinder segment surface (Armin Ilg)
• PR1370:       Feature celeritas integration (Sakib Rahman/EIC)
• PR1377:       Use canonical variables for the installation locations of libraries and binaries (Andriish)
       ==> Idea to have an additional DD4HEP_PLUGIN_PATH and remove dd4hep plugins fdrom the LD_LIBRARY_PATH
  
  

        New Pending PRs and ISSUEs:

• ISSUE1431: Unstable particle decays twice in generator and in simulation creating duplicate particles

Round Table

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Andre:       NTR
Markus:    NTR
Peter:        NTR

AOB

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Next meeting:   April 24th, 2025

1 Around the table