Geometry & Transport Working Group

[ Software Requirements Document ] [ Users Requirements Document ] [ Traceability Matrix ] [ Planned Activities ]

The Geant4 geometry working group is responsible for the development and maintenance of the geometry modeller in the Geant4 toolkit. The development in the Geant4 geometry modeller spawns within the following areas: geometrical shapes, navigation algorithms, detector modelling techniques (volumes positioning), transportation in field and importance biasing techniques.
The Working Group is currently composed by:

Gabriele Cosmo, CERN (coordinator - management, navigation, volumes)

John Apostolakis, CERN (deputy-coordinator - field, navigation)

Pedro Arce Dubois, CIEMAT (navigation, volumes)

Makoto Asai, SLAC (biasing, volumes)

Marek Gayer, CERN (solids)

Vladimir Grichine, Russian Academy of Sciences (solids)

Ivana Hrivnacova, IN2P3 Orsay (g3tog4, volumes)

Tatiana Nikitina, IN2P3 Saclay (field, solids)

Development

Detector Description

GDML - Geometry Description Markup Language: specifications
- G.Cosmo

Solids

Twisted shapes (PDF), by O.Link
- Contact: V.Grichine
Using the Surface-Checker test (PDF), by O.Link
- Contact: T.Nikitina

Cuts by detector region

Category class diagrams: Geometry, Processes, Track.
Use cases through interaction diagrams:
1. Standard initialisation (Define region, set cuts, build physics table)
2. Alternative initialisation (Define production cut, add/remove region)
3. Step computation and tracking (PostStepDoIt, handling of material-cut-couples)

Parallel Navigation

Design description.
Category class diagrams: Multiple Navigators, Path Finder.
Use cases through interaction diagrams:

Event biasing

Latest development in importance sampling and scoring: documentation (by M.Dressel)
- Contact: A.Howard
Scoring and geometrical importance sampling use cases (by M.Dressel)
- Contact: A.Howard

Tallies

User Requirements Document (PDF, v.0.2), by G.Daquino
- Contact: A.Howard

Code Reviews

Field propagation, October 2009

LXR Code Browsing

Talks

Reference-counted touchables proposal (HTML, PPT)
- R.Chytracek, May 2001
Importance Sampling (geometrical splitting and Russian Roulette) (PDF)
- M.Dressel, November 2002

Recent Publications

Parallel Geometries, IEEE-2008 (May 2008)
Regular Navigation, IEEE-2008 (May 2008)
Geometry Modeler Updates, CHEP-2006 (May 2006)
Geometry Modeler, IEEE-2004 (October 2004)

Geometry Tutorial

School course (February 2010), based on Geant4 9.3 release
- Part 1 - Part 2 - Part 3 - Part 4 - Part 5