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DD4hep Meeting January23rd, 2024

Name: DD4hep Developers Meeting
Start: 2025-01-23T15:30:00+01:00
End: 2025-01-23T16:00:00+01:00
Location: zoom

Present: A.Tolosa Delgado, M.Frank, T.Madlehner

Apologies: A.Sailer

Link to minutes of previous meeting

Merged PRs

PR1371: Read edm4hep (Andre)
PR1374: Do not set or read the color flow for MCParticles from EDM4hep (Juan Carceller)
PR1376: DD4hepSimulation: pass self to the steeringFile eval (Dimitry Kalinkin)
PR1380: Restore compatibility with EDM4hep 0.10 (Juan Carceller)
PR1384: Handle ganged segmentations (Scott Snyder)
==> Allow for implementations of segmentations spanning multiple volumes
==> Use case ?
PR1385: Fix typo in comment (Scott Snyder)
PR1386: Fix potential use of dangling temporary (Scott Snyder)
PR1387: Pseudotrap ref updates. (Markus)

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 ?

ISSUE1379: Discussion: Evolution of edm4hep and dd4hep enhancement (Markus)

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
PR1378: Use standard locations if the LD_LIBRARY_PATH or ROOTSYS are empty (Andriish)

Closed issues and fixed problems

ISSUE1343: want to get a parameter into ddsim SDAction at run time (Sarah Eno)
ISSUE1369: Create EDM4hep reader for DDG4 (Andre)
ISSUE1372: multiple actions within same subdetector question (Daniel Jeans)
ISSUE1382: More useful crash message question (Sarah Eno)

Round Table

Alvaro:      Issue with implementing segmentations. The use case is to have a custom segmentation for
                  specialized sensitive volumes. Required is a user supplied parameter to the readout and
                  the detector element of the sensitive volume. These are already available in the upper level
                  segmentation though. Alvaro will have a look if this information will help to provide a
                  cache object to support such segmentations.
Markus:    Struggeling with the optimization of the Geant4VolumeManager. In principle finished, but now
                  strongly fighting github tests. Getting inconsistent results from dev3 slot.
Thomas: Reviewed Andres PRs.

AOB

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Next meeting: February 6th, 2024

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