Patch4.5.1-1.txt

                 Geant4 5.1 - patch-01 Release Notes
                 -----------------------------------

                                                            19 May 2003

List of fixes included in this public patch to release 5.1:

  o Electromagnetic processes (standard):
    ------------------------------------
  + muons:
    - Commented out debug printout in G4MuPairProduction.

  o Geometry:
    --------
  + solids/Boolean:
    - Added set/get methods for scale precision in G4ReflectionFactory.
  + volumes:
    - G4PropagatorInField.cc: fix in ComputeStep() to avoid step computation
      if proposed step length is too small. Fixes problem noticed in release
      5.1 and occasionally appearing as "Invalid Enum in [solid-type]", also
      registered as problem report #485.

  o Hadronic processes:
    ------------------
  + models/generator/kinetic_model
    o G4BinaryCascade: fix to cure infinite loop observed in inelastic
      scattering of hydrogen.

  o Run:
    ---
  - G4RunManager: fixed behavior of function DefineWorldVolume()
    to properly reset navigation history and optimisation in case the
    topology of the geometry has changed between runs. Now only a single
    call to DefineWorldVolume() is necessary when changing the geometry.
    Fixes also problem report #481.
    o Added new boolean argument (default set to TRUE) to specify if
      topology has changed.
    o Forced open/close geometry in method ResetNavigator() to properly
      reset G4Navigator status and remove old optimisations.

  o Examples:
    --------
    - novice/N04
      o Corrected printout.
    - extended/electromagnetic - TestEm1, TestEm2, TestEm3
      o Simplified mechanism for updating geometries between runs,
        according to changes in G4RunManager::DefineWorldVolume().

 ----------------------------------------------------------------------------

                             Technical Notes
                             --------------- 

  o  This patch should be applied on top of release 5.1.
  o  Technical notes distributed for release 5.1 are also applicable and
     valid for this patch.

The code and rebuilt binary libraries for release 5.1 are available through
our "Source Code" Web page:  http://cern.ch/geant4

Please refer to the Geant4 User Documentation:
   http://cern.ch/geant4/G4UsersDocuments/Overview/html
for further information about using Geant4.