DD4hep Meeting October 30th, 2025

Present:     Andre, Juan, Peter, Thomas

Apologies: Markus

Link to minutes of previous meeting

New release: v01-33

Repository:   AIDASoft/DD4hep
Tag:                v01-33
Commit:        e369490
Released by: andresailer

Merged PRs

Low activity: two requests merged

• PR1516:  Fix a deprecation warning in EDM4hepFileReader.cpp
• PR1517:  Add a new EDM4hep file after the changes to generator-related information

Closed PRs, closed issues and fixed problems

• None

Pending Problems

• ISSUE1297:  Possible to dump all available readout elements?
                        ==> Possibly a copy of unsolved ISSUE580 from Valentin about enumerating all sensitive cells.
• 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.
• PR1240:        Add multithreading support to ddsim
• PR1314:        Cylinder segment surface (Armin Ilg)
• ISSUE1373:  Add GeneratorInfo to EDM4hepReader (Andre)
• ISSUE1443:  Make user particle handler extensible
                         ---> Maybe we should take advantage and re-collect requirements.
• ISSUE1458: XML file vs TGeoStored geometry in GenFit
• ISSUE1487: The test t_DDDigi_sim_test_weighted_deposit_overlay can fail (Juan)
    ---> Unstable test 
• ISSUE1489:  using SkinSurfacequestion
• ISSUE1492:  Readout segmentation for multiple cylinders with offset axes question
                        ----> Unclear code in CylindricalGridPhiZ.cpp line 80
                        ----> Try special case where axis is identical to beam axis.
• ISSUE1501: Bug/Feature: Condense duplicated particle contributions in calorimeter question
  
  New:

• ISSUE1489: using SkinSurface
                        ----> Issue re-opened by Sara Eno
                        ----> Does she have a problem with the interface ?
• ISSUE1514: How to convert Geant4TrackID into MCParticle Parent ID
• ISSUE1515: How to apply the step_length_max limit to neutral particles?
                        ----> Issue opened by Andreas Loeschke
  
  Pending PR:
• PR1498:  Modernize code related to Surfaces and the SurfaceManager (Juan)
• PR1503:  [WIP] Add flag for fast simulation to MCParticle

Round Table

Andre:     NTR
Juan:.     Question: test about the boxOfStraws. The readouts are not found when it fails. If you shot a muon from the corner of the box to the centre of the box it always triggers.
   -> open PR with this particle gun setup 

Peter:    NTR

Thomas: NTR

AOB

Next meeting:   November 13th, 2025