DD4hep Meeting February 6th, 2025

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

Apologies: A.Tolosa Delgado

Link to minutes of previous meeting

Merged PRs

• PR1378:  Use standard locations if the LD_LIBRARY_PATH or ROOTSYS are empty (Andriish)
• PR1397:  g4GraphicalScan.py: produce 2d scan of models, using g4 material description (Daniel Jeans)
                   ==> Tool to create nice geometry scans:
                          

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);
  

• 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)
                        ==> Why not closed ?

• ISSUE1392:  DD4hep installation fails if Intel compiler is used for compilation
                        ==> Should we support icc ?

        Pending PRs:(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)
  
  

        New Pending PRs:

• 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

Closed issues and fixed problems

• ISSUE1379:  Discussion: Evolution of edm4hep and dd4hep enhancement (Markus)
                        ==> No real results. Will close this issue.
• ISSUE1391:  DD4Hep installation paths do not adhere common standards.
• ISSUE1393:  function ( fill_dd4hep_library_path ) uses incorrect locations of libraries
                        (andriish ==> Locked out from conversation)
• ISSUE1394:  digis (Sarah Eno)
• ISSUE1395:  multiple g4MaterialScans

Round Table

Andre:       New tag created 1.31
Markus:    NTR
Thomas:   NTR
Peter:        NTR

AOB

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Next meeting:   February 20th, 2025