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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 19th, 2026

Present:     Andre, Juan, Markus, Peter, Thomas

Apologies: 


Link to minutes of previous meeting

Merged PRs

  • PR1580:     fix: allow improved G4ParameterisedNavigation for pure 1D translation case (Wouter)

  • PR1584:     feat: use axis-aligned bounding box to pre-filter MultipoleField calls  (Wouter)
    ISSUE1582:  Axis-aligned bounding box for MultipoleField: interest in upstreaming?enhancement
  • PR1586:     Fix some memory leaks (Juan)
  • PR1589:     Clean up checks since the minimum C++ standard is 17 (Juan)
  • PR1591:     Implement overlayed constant field type limited to a given shape (Markus)
  • PR1592:     Geant4ParticleHandler: Keep particles back-scattered from calorimeter...  (Markus)
    PR1595:     User particle hadler: fix for backscatters (Andre)
    ISSUE471:  missing MCParticle for particles scattered back into the calorimeter
                ===> Finally !
  • PR1593:     Tests: ignore pseudotrap on aarch64, relax condition for voxelisationtest  (Andre)
  • PR1596:     Edm4hep input configurations (Andre)

Closed PRs, closed issues and fixed problems

  • ISSUE1588:  Placement of volumes using paramVolume1D
                ===> User error

Pending Problems

  • ISSUE1297:  Possible to dump all available readout elements?
                          ==> Possibly a copy of unsolved ISSUE580 from Valentin about enumerating all sensitive cells.
  • ISSUE1335:   Uniform random picking of points on detector surfaces for noise studies
                           This problem is linked to #1297 and #580.
  • ISSUE1458: XML file vs TGeoStored geometry in GenFit
  • ISSUE1501: Bug/Feature: Condense duplicated particle contributions in calorimeter question
  • ISSUE1514: How to convert Geant4TrackID into MCParticle Parent ID
  • ISSUE1535: How to add new output variables in Hitsquestion (matclim -> DD4SHip)
                          ===> Debugging ongoing

New issues:

  • ISSUE1594:  Test failures for tesselated volumes (Andre)
  • ISSUE1597:  Remove LCDD data conversion.cleanup  (Markus)
                Not used since SLIC is not supported. Need to extract vis-extraction.

    Pending PR:
  • PR1582:   Set the fast simulation flag and adjust step length for contributions created by fast simulation (Thomas)
  • PR1587:   Fields/FieldTypes: performance related cleanups (David Lange)
  • PR1590:   Fix more memory leaks (Juan)  [NEW]
  • PR1598:   fix: randomize non-zero polarization in optical photon gun  (Wouter)  [NEW]

Round Table

Andre:            New tag coming up. 
Juan:.             NTR
Markus:          Somehow need to define a common place with minimal compile dependencies where to take pi, twopi, e, phi, etc from.
                        CLHEP is sort of not the best solution (see also PR1598).
                        math.h/cmath  TMath.h (looks very complete) ....
                        Thomas proposed to wait for the C++ 20 and the "numbers" header file.
Peter:             NTR
Thomas:        NTR

AOB

Next meeting:   April 2nd, 2026

There are minutes attached to this event. Show them.
    • 15:30 → 15:50
      Around the table 20m