DD4hep Developers Meeting

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Andre Sailer (CERN), Markus Frank (CERN)
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Please Join DD4hep developer's meeting via Zoom

DD4hep Developers Meeting
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68917133930
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Andre Sailer
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DD4hep Meeting March 20th, 2025

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

Apologies: A.Tolosa Delgado, T.Madlehner 


Link to minutes of previous meeting

Merged PRs

  • PR1415: Improve coverity scans (Markus)
  • PR1416: Improve help replies (See issue 1409, closed) (Markus)
  • PR1417: Support multithreading in Geant4EDM4hepOutput plugin (Wouter)
  • PR1420: Allow to selectively disable DD4HEP sub-packages (Markus) 
    $> cmake -DDD4HEP_DISABLE_PACKAGES="DDRec DDEve DDDigi"  ../DD4hep
  • PR1421: fix typo in CMakeLists.txt (Charles)
    --> Fix to above PR1420. I tested though...
  • PR1422: Add LANGUAGES CXX to the project command not to depend on a C compiler (Juan Miguel)
  • PR1414: Fix the result of innerMaterial() and outerMaterial() depending on if the other is called first (Juan Miguel)
    --> Important fix. Should improve tracking.
    --> Fixes ISSUE1413
  • PR1425: Documentation fixes  (Juan Miguel)
    --> Let's thank Juan-Miguel!. Let's remind ourselves that documentation is really treated like a step-child.
  • PR1426: Only build components that need ROOT::Eve if it's available (Charles)
    --> Continuation of story starting with PR1420 and PR1421 . Still there is ISSUE1424 and PR1428 (see below).
    --> ISSUE1418 was closed, but probably premature
  • PR1427:  Remove C++ preprocessor checks for a standard before C++14

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.
  • 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.

  • ISSUE1419:  Assigning multiple sensitive volumes to a single readout Id
  • ISSUE1429:  Error with ROOT::Eve when building DD4hep
  • 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:

  • PR1428:  CMake: do not build DDEve if ROOT::Eve does not exist

Closed issues and fixed problems

  • ISSUE1409:  Cannot get help with -h or --help?enhancement
  • ISSUE1413:  The result of innerMaterial and outerMaterial depends on if the other function is called beforebug
  • ISSUE1418:  Possible to build without Eve dependencyquestion

Round Table

Andre:       NTR
Markus:    NTR
Peter:        NTR

AOB

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Next meeting:   April 10th, 2025

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