Work items for 2008

 

Work items for 2008

 


 
Priority List

 

Items marked with will involve contribution from external sources interested in the project.
Items marked with will require coordination with more than one Working Group.

  1. Performance tuning:
    • Field performance evaluation and tuning/benchmark
      • Complete study on electromagnetic-field tuning of parameters and algorithms used for stepping and integration
      • Study potential use of derivatives, average values, access to field value (GetFieldValue()), composite steppers, new available algorithms (Brent method). Study the possibility of utilising a user minimum step
    • Organise a code review for selected CSG shapes
      • Identify places where code is duplicated and could be simplified; study ways of caching calculation of constants and reuse them efficiently; identify hot-spots performance critical
      • Give priority first to most common used shapes
  2. Robustness checking and improvements:
    • Review response precision of solids on points close to surface and normals. Verify accuracy of 2nd order equations
      • Reiterate the tests on surface for random points close to (and far from) the solids' surface, to quantify the precision of the response according to the geometrical tolerance. Verify the conditions under which the surface normal must be computed and the accuracy of the algorithms implemented
    • Usage of safety on exiting surfaces in navigator
      • Fix behavior of G4Navigator for the treatment of the safety which currently ignores exiting surfaces
    • Interoperability of multiple navigators/geometries
      • Identify critical test cases for use of parallel geometries and combined use-cases (scoring+fast_parameterisation, biasing+scoring, etc..)
      • Review current design and implementation to address remaining open issues
    • Review of magnetic field classes
      • Identify and improve areas where the implementation is performance critical
      • Improve existing implementation to allow easier and more intuitive API to users for tuning performance and field response
    • Use of direction in replica navigation
      • Review and extend implementation of G4ReplicaNavigation to take into account of position and direction when locating on egdes or along surfaces
    • Revision of use of angular/radial tolerances in CGS solids
      • Review implementation of sphere, tubs, cons and torus for usage of angular and radial tolerances; identify cases which may lead to imprecise response in the current code
  3. New features:
    • GDML writer and support for parameterised volumes
      • Implement ability to dump on GDML files geometries loaded in memory
      • Extend existing GDML plugin to support missing features, like parameterised volumes, optical properties, external attributes, etc... Verify that all existing features available in GDML 2.X series are supported and generated GDML files are readable
      • Integrate stand-alone tool for conversion of CAD geometries to tessellated solids
    • ASCII detector description persistency
      • Allow for importing detector descriptions defined in ASCII format
    • Extension of G4Region to local magnetic fields
      • Allow for associating magnetic fields to detector regions and propagate the attributes to volumes which are part of the region
  4. Documentation:
    • Publication on refereed journal
      • Aim on publishing a paper of the Geant4 geometry modeller, including recent extensions for navigation on regular phantoms geometries on a chosen refereed journal

Previous years planned activities

 

2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007

 

Created: 31 January 2008
Modified: 31 January 2008, GC