DD4hep Meeting November 21rst, 2024

Present:  A.Sailer, M.Frank, P.McKeown

Apologies:

Link to minutes of previous meeting

Merged PRs

• PR       1352  : DDG4: add possibility to control verbosity for physics constructors (Andre)
  ISSUE 1351  : Feature Request: Adjustable Verbosity for Physics List Initialization in DDSim (Andre)
• PR       1355  : Ddcms geant4 clhep
  ISSUE 1354  : DDCMS: Linker error related to Geant4 library location

Pending Problems

• 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;
• ISSUE1296:  DetectorImp::endDocument() called twice for some geometries?
                        ==> Unsure if it is a problem wrongly configuring multiple xml inputs.
• 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. Questions after re-reading, calls like:
  

  Handle<SomeSegmentation> seg = multisegmentation->subSegmentation(cellID);
  or
  Segmentation* seg = multisegmentation->subSegmentation(cellID);
  

• ISSUE 1335: Uniform random picking of points on detector surfaces for noise studies
              This problem is linked to #1297 and #580 .
• ISSUE 1343: want to get a parameter into ddsim SDAction at run time
• ISSUE 1356: Limitation on the number of event for hepevt
               Hard limit in event reader to satisfy coverity. Should it be put higher ?
  
  Pending (no changes since last meeting):
• PR1240:     Add multithreading support to ddsim
• PR1304:     SurfaceManager: lazily construct surface maps on demand (Leonhard Reichenbach)
• PR1314:     Cylinder segment surface (Armin Ilg)

Closed issues and fixed problems

• PR 1353:       Bug fix in Segmentation's CylindricalGridPhiZ and PolarGridRPhi2
                         ==> dropped
• ISSUE 1350: Error in setDetectorTypeFlag: map::at
                        ==> explanation sorted out by Andre

Round Table

Andre:     NTR
Markus:  DDEve7: working on the new event display for ROOT7.
Peter:      Working on placement of hadronic showers. Working together with folks at Desy.

AOB

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Next meeting:   December 5th, 2024