v48.0.0

48.0.0

🚨 BREAKING CHANGES

• Migrate GridSurfaceMaterial to MultiAxis (#5871) by @asalzburger
• No_discard attribute for Acts::Result (#5700) by @benjaminhuth
• Pass navigation start and target surfaces to initialize (#5797) by @andiwand
• Extend EDM4hep plugin track conversion for drop-in converter parity (#5676) by @madbaron
• Remove the hidden in/out views from the triplet seeding API (#6006) by @andiwand
• Clean up triplet seeding config structs and grid API (#6004) by @andiwand
• Keep unbound surfaces in the navigation stream (#5318) by @junggjo9
• Drop beveled cylinder bounds (#6116) by @andiwand
• Remove API deprecated in v47.0.0 (#6112) by @andiwand
• Move Transform2/Transform3 from Affine to Isometry (#6040) by @andiwand
• (material) Replace TrackingGeometryMaterial pair with named fields (#6123) by @paulgessinger
• (detray) Clean up detector definitions (#6055) by @niermann999
• Add staggering correction for tubes in the grid based Multi-layer Navigation policy (#6107) by @dimitra97
• Split the navigator external surfaces into three inputs (#6064) by @andiwand
• Make stepper reads side-effect free and transport explicit (#6108) by @andiwand

🚀 Features

• Axis-aligned envelope mode for PadBlueprintNode (off-axis subtrees) (#5782) by @paulgessinger
• (detray) Detector concept (#6056) by @niermann999
• Expose more params as args for addVertexFitting in reconstruction.py (#6057) by @altsybee
• (traccc) Allow GBTS seeding in alpaka full chain example (#6068) by @m-fila
• GBTS on ODD (#6067) by @mimodekjaer
• GeoModeMuonlMockup Add material wheels in the mock up (#6078) by @junggjo9
• Add track propagation through Python bindings (#6032) by @H4m5t3r
• Gbts allow intra layer linking (#5982) by @m-brettell
• (traccc) Add support for suspension in clustering and seeding algorithms (#5878) by @m-fila
• (traccc) Add HIP combinatorial Kálmán filter (#6096) by @stephenswat
• (traccc) GBTS GPU deterministic seed extraction (#6125) by @mimodekjaer
• (material) Support stable keys for surface material assignments (#6109) by @paulgessinger
• Introduce IVertexFitter and implement it in AMVF (#6091) by @paulgessinger
• (traccc) GBTS on GPU fill graph edges (#6089) by @mimodekjaer
• Improve Python bindings for the track container (#5963) by @benjaminhuth
• (traccc) Add suspension in GBTS seeding algorithm (#6122) by @m-fila
• (traccc) Add suspension in track finding and fitting algorithms (#6045) by @m-fila
• Print some aggregate statistics in track fitting (#6104) by @benjaminhuth
• Add direct-child volume ID assignment to blueprint nodes (#6145) by @paulgessinger
• 4d seeding time (#6101) by @pbutti
• Add Mille Solver (#5954) by @goblirsc
• (detray) Perigee extrapolator (#6084) by @zovelsanj
• (traccc) HIP GBTS version (#6165) by @mimodekjaer

🐛 Bug Fixes

• Move the avogadro constant to acts units (#6041) by @dimitra97
• Take a disc's bound to cartesian jacobian in the surface's own frame (#6061) by @andiwand
• Do not write fake tracks as an "Unknown" classification (#6063) by @pbutti
• (Geometry) Take customizer node pointers by const reference (#6069) by @paulgessinger
• (traccc) Fix CUDA 13.4 conversion warnings (#6074) by @stephenswat
• Update GSF stepper components through the single stepper (#6058) by @andiwand
• (detray) Fix CUDA 13.4 conversion warnings (#6073) by @stephenswat
• Forward missing config args to the seeders in python (#6052) by @benjaminhuth
• Size the surface array window by the crossing angle (#6038) by @andiwand
• (detray) Undefined names in Python error paths (#6075) by @Anai-Guo
• (traccc) Fix shared memory bug in HIP seed selection (#6103) by @stephenswat
• (detray) Remove CUDA/HIP annotations from deduction guides (#6113) by @stephenswat
• Keep detector alive through tracking geometry (#6131) by @benjaminhuth
• (traccc) Remove infinite loop in p-value computation (#6114) by @stephenswat
• Disable assertions in pypi wheel build (#6093) by @benjaminhuth
• (detray) A few CI issues and clean up names (#6127) by @niermann999
• (traccc) Fix several RAII use-after-free bugs (#6136) by @stephenswat
• Gx2Fitter - Append external surfaces in the last propagation (#6099) by @junggjo9
• Enable EDM4hep plugin in Key4hep CI build (#6167) by @jmcarcell
• Use polyhedron representation for GBTS layer dimensions (#6162) by @mimodekjaer
• Nodiscard and boost with clang21 / macOS 27 (#6174) by @asalzburger
• Expose b-field option of GBTS to python (#6187) by @benjaminhuth
• (traccc) GBTS use odd length track states (#6189) by @mimodekjaer
• (traccc) GBTS wrong value in kalman update (#6190) by @mimodekjaer

◀️ Revert

• Remove IVertexFitter and AMVF conformance (#6151) by @paulgessinger

🚜 Refactor

• Clean up the GBTS old tunings flags and layer id types (#6028) by @andiwand
• Give the GBTS geometry a public view of its eta binning (#6035) by @andiwand
• (detray) Remake toy detector generation (#5966) by @VladimirDrobny
• GBTS Remove the layer depends of ITk (#6036) by @mimodekjaer
• Split AMVF fitter state into fit problem and cache (#5879) by @paulgessinger
• (traccc) Clean up CCL kernel types (#6080) by @stephenswat
• Attach DigitizationDesign to surfaces (#5701) by @delitez
• ERROR Counting in Fatras (#6082) by @katrinfriedrichs
• (json) Dispatch surface material (de)serialization via TypeDispatcher (#6023) by @paulgessinger
• (Json) Decouple surface and surface bounds json decoding (#6026) by @paulgessinger
• (traccc) Use designated initializers in GBTS (#6141) by @stephenswat
• (dd4hep) Preserve deferred proto material axes (#6156) by @paulgessinger
• Add visitor-based octree traversal (#6095) by @paulgessinger
• Muon mockup geometry small refactoring and add propagation script (#6146) by @dimitra97

📚 Documentation

• Follow the GBTS barrel order in the GBTS page (#6060) by @andiwand

⚡ Performance

• (traccc) Use compact device vector for detectors (#6042) by @stephenswat
• Specialise the sympy vacuum step on covariance transport (#5977) by @andiwand
• (traccc) Radix measurement sorting (#6071) by @mimodekjaer
• (traccc) Avoid pageable copies in GBTS algorithm (#6062) by @stephenswat
• (traccc) Set block count of propagate kernel (#6047) by @stephenswat
• Specialise the sympy dense step on covariance transport (#5978) by @andiwand
• Invert placements as rigid transforms, and skip the angle in the local derivatives (#6048) by @andiwand
• Hand the sympy vacuum kernel dt/ds (#6059) by @andiwand
• (detray) Force type registry index map into constant memory (#6020) by @stephenswat
• (traccc) Transpose find_tracks temporary order (#6117) by @stephenswat
• (traccc) Extend compiler hints to HIP (#6143) by @stephenswat
• Avoid allocations in ColliderMLRelease1InputConverter (#6161) by @benjaminhuth
• (fatras) Avoid materialising all bin edges per hit in Segmentizer (#6077) by @pbutti
• Tighten ttbar+pu200 seeding config on ODD (#6132) by @benjaminhuth
• (traccc) GBTS GPU async node create (#6164) by @mimodekjaer
• (traccc) Fuse GBTS CCA loops (#6181) by @stephenswat
• (traccc) Eliminate more GBTS unpinned memory copies (#6186) by @stephenswat

🧪 Testing

• (detray) Check the direction of transformed vectors (#6011) by @mohitt31

🛠️ Build

• (deps) Bump astral-sh/setup-uv from 9.0.0 to 10.0.1 (#5937) by @dependabot[bot]
• (detray) Upper bound [[no_unique_address]] workaround (#6072) by @stephenswat
• (deps) Bump the github-actions group with 2 updates (#6126) by @dependabot[bot]
• Add tri-state ACTS_USE_ZSTD option (#6148) by @paulgessinger

⚙️ Miscellaneous Tasks

• Automated python requirements upgrades (#6039) by @github-actions[bot]
• Add a traccc HIP compile leg on the rocm7 flavor (#5908) by @paulgessinger
• Build the alpaka backend on the traccc CUDA and HIP legs (#5906) by @paulgessinger
• Move the remaining jobs to ubuntu 26.04 and dependencies v24.1.0 (#5905) by @paulgessinger
• Take actsvg, vecmem, covfie and Google Benchmark from the spack environment (#6066) by @paulgessinger
• (traccc) Enable additional pre-commit checks (#5759) by @stephenswat
• Build the Alpaka backend on the traccc CPU legs (#6085) by @paulgessinger
• Make nightly PyPI build manually triggered (#6094) by @benjaminhuth
• Bump wheel dependencies and include them in version bumps (#6105) by @paulgessinger
• Code Notifications, main branch (2026.09.16.) (#6100) by @krasznaa
• Reduce unnecessary builds and compiler-cache pressure (#6086) by @paulgessinger
• Modify Mille writer to use thread-friendly(er) approach (#5953) by @goblirsc
• Automated python requirements upgrades (#6076) by @github-actions[bot]
• Fix for boost hash v2 version (#6140) by @goblirsc
• Single source of truth for dependency versions (#6152) by @paulgessinger
• Limit Detray and Traccc builds to package changes (#6149) by @paulgessinger
• (traccc) Remove CPU algorithms (#6154) by @stephenswat
• Test Key4hep with AlmaLinux 9 and C++23 (#6139) by @paulgessinger
• Automated python requirements upgrades (#6170) by @github-actions[bot]
• Pilot sccache with CERN S3 storage (#6171) by @paulgessinger
• Pilot ccache snapshots in CERN S3 (#6177) by @paulgessinger
• Migrate remaining compiler caches to CERN S3 (#6188) by @paulgessinger
• Reclaim Traccc/ directory in CODEOWNERS (#6191) by @stephenswat