Work items for 2010

 

Work items for 2010

 

 
Priority List

 

Items marked with refer to new developments.
Items marked with will involve new man-power or contribution from external sources interested in the project.
Items marked with will require coordination with more than one Working Group.

  1. Architecture review:
    • Review of classes exposed to kernel and thread-safety
      • Feasibility study and implementation of thread-safety for classes affected by mixing of R/W and R-only data
      • Priority given to classes exposed to internal use by other categories within the Geant4 kernel
    • Finalisation of 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
  2. Robustness checking and improvements:
    • Review accuracy of 2nd order equations for points close to surface on last remaining solids (G4Cons, G4Orb, ...)
      • 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; identify cases with wrong answers in solids not yet analysed and improve testing
      • Verify where to apply c/(|b|+sqrt(D)) solution
    • Implementation of additional precise ComputeSafety() in navigation
      • Provide alternative Computesafety() for use by physics processes (mainly EM) for measuring the exact safety value, not limited by voxels boundaries
    • Apply improvements to regular navigation to increase efficiency and precision and reduce memory consumption
      • Implement more efficient indexing of cells, in conjunction with improvements to algorithms in scoring
      • Allow for better efficiency and precision, also by implementing more precise safety calculation in case of neighbouring voxels skipping for same materials
    • Implement recommendations from code review of field intersection locator classes and resolve known issues
      • Cleanup code of field intersection classes and simplify overall implementation
      • Resolve known bugs
    • Adoption of direction in replica navigation
      • Review implementation of G4ReplicaNavigation to take into account of position and direction when locating on egdes or along surfaces
  3. Performance tuning:
    • Continue 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
      • Behavior on shared surfaces, etc...
  4. New features:
    • Extension of parameterisation to cylinders for regular navigation
      • Allow for cylindrical phantom parameterisation as choice in place of cubic cells
    • New arbitrary trapezoid shape with up to 8 vertices lying on two parallel planes perperdincular to Z axis
      • New specific solid with discrete mathematical definition of surfaces; verification of its suitability for Geant4 tracking requirements
    • Extension to divisions to allow for gaps in replicated daughters
      • Review G4PVDivision class to allow possibility to introduce gaps between divided elements for the supported solids
    • Review design of new interface for field accuracy settings and inclusion in distribution
      • Provide more intuitive API to users for tuning performance and field response
  5. Documentation:
    • Publication on refereed journal
      • Aim on publishing a paper (pre-print) of the Geant4 geometry modeler on a chosen refereed journal

Previous years planned activities

 

2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009

 

Created: 18 January 2010
Modified: 20 January 2010, GC