Work items for 2007

 

Work items for 2007

 


 
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:
    • Full application tuning (benchmark suite) with field
      • Deploy a benchmark suite to system testing based on a real case application to monitor effects of code changes in the performance in every new development release. Review also the existing examples
    • Field performance tuning/benchmark
      • Complete study on electromagnetic-field tuning of parameters and algorithms used for stepping and integration
  2. Robustness checking:
    • 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 for tubes, cons and spheres
    • Review of navigator implementation for double calls and behavior on coincident surfaces
      • Verify and extend the implementation of G4Navigator to provide more robust and safe behavior for methods that may modify the navigator state. review usage of such methods by clients (e.g. multiple-scattering process). Investigate the response on coincident surfaces with concrete test-cases
  3. New features:
    • Tunable tolerance
      • Provide possibility of optionally setting tolerance for surface thickness and intersection calculation
      • Release the already implement mechanism for automatic evaluation of the tolerance according to the geometry topology
    • Parallel navigator, completed migration
      • Complete tests and increase robustness of the existing prototype for 'multiple' navigation (verify the consistency of the results in the mass geometry, list all the possible use-cases and setups, make performance tests). Make the new 'coupled' transportation become the default one and complete the migration for biasing, tallying/scoring, readout and fast parameterisation modules
    • Optimised navigation for voxelised phantom geometries
      • Allow for simplified intersection calculation applicable to regular geometrical structures defined through replicated voxels (boxes)
    • New specific paraboloid shape
      • Implement a new specific solid with parabolic cross-section, with possibilty of cut in Z and definition of shell thickness
    • New specific extruded-solid shape
      • Implement a new specific solid representing the extrusion of an arbitrary polygon with fixed outline in the defined Z sections
    • Integration of Geant4e, error-propagation module
      • Integrate module for error-propagation developed in CMS
  4. Implementation improvement, maintainability:
    • Refactoring and revision of biasing/scoring processes
      • Design & code review of existing biasing & scoring modules for convergence to a unique solution
    • Review of field user classes
      • Improve existing implementation to allow easier and more intuitive API to users for tuning performance and field response
    • Review implementation of Boolean solids
      • Revisit the algorithms at the base of the Boolean operations on solids to improve their efficiency (usage of bounding-boxes around the shapes). Get rid of current limitations and allow for multiple Boolean operations constructs
    • Code review for BREP specific solids
      • Review implementation of concrete BREP solids to reduce code duplication and make better use of existing infrastructure
  5. Documentation:
    • Review of user documentation and publication of a paper on a refereed journal
      • Review chapter on geometry in the User's Guide to include new features and modifications according to development. Aim on publishing a paper of the Geant4 geometry modeller on a chosen refereed journal

Previous years planned activities

 

2001 | 2002 | 2003 | 2004 | 2005 | 2006

 

Created: 22 January 2007
Modified: 7 March 2007, GC