Geant4 4.0 - patch-01 Release Notes
                 -----------------------------------

                                                      31st January 2002

List of fixes included in this public patch to release 4.0:

  o Event:
    -----
  - G4PrimaryTransformer: removed check whether the primary vertex is
    inside the world volume. The check has been moved to G4SteppingManager.

  o Geometry:
    --------
  - Magnetic field:
    o Activated G4DEBUG_FIELD in GNUmakefile.
    o G4MagHelicalStepper.cc: renamed local variables "*Momentum*"
      to "*Velocity*". 
  - Management:
    o G4AffineTransform.icc: fixed trivial compilation warning for gcc-2.95.2.
  - Volumes:
    o G4AuxiliaryNavServices: critical fix, to only consider whether a
      'ray' (Point,Direction) is on the surface (it was erroneously also
      checking for those inside volumes). This erroneous condition occurred
      frequently in the new usage of Locate with Direction to initialise a
      step.  
    o G4Navigator: reset blocked volume when locating 'within volume',
      after ensuring that it does not get called when ComputeSafety() is at
      a boundary. Fixes cases of longstanding 'Point P is Inside' errors.
    o Activated mechanism in GNUmakefile for allowing compilation with
      G4DEBUG_FIELD or G4DEBUG_NAVIGATION flags.
  - solids/Boolean:
    o Moved all verbosity mode warnings to G4BOOLDEBUG.
    o Activated G4BOOLDEBUG mechanism in GNUmakefile.
  - solids/BREPS:
    o G4BREPSolidPCone: bugfix for problem report #320.
      Fixed missing use-case in constructor when RMAX and RMIN have been
      changed for 2 consecutive equal z-values. Now it creates correctly
      2 planar surfaces as expected.
      Added private method ComputePlanarSurface() gained
      by refactoring of some part of the code in the constructor.
    o G4FPlane: fixed first constructor adding new argument for setting
      explicitly the sense of a surface if required.
      Fixed G4FPlane::Intersect() method which incorrectly ignored a special
      case of a hit on surface point with ray direction opposite to surface
      normal.
  - solids/CSG:
    o G4Sphere.cc: fixed a problem with tolerances in the case of large Radius.
    o Moved all verbosity mode warnings to G4CSGDEBUG.
    o Activated G4CSGDEBUG mechanism in GNUmakefile.

  o Global:
    ------
    - G4strstreambuf: plugged memory leak in destructor for buffer deletion.
      Temporary fix to G4strstream::overflow(c) for GNU gcc-3.X compilers
      (also problem report #342), which require returning of character 'c' in
      case of buffer flushing for <CR>.
    - Replaced 'NULL' with '0' in G4Allocator.hh, G4strstreambuf.icc
      and G4Timer.cc.
    - Removed obsolete inline definitions in g4std/wrappers/DEC-cxx/cmath.

  o Materials:
    ---------
    - Fixed G4MaterialPropertyVector::AddElement() to consider ordering
      of elements. 

  o Track & Tracking:
    ----------------
  - track:
    o G4Track: corrected initialization of fStepLength in constructors.
      Fixed bug in assignment operator for fStepLength.
  - tracking:
    o G4SteppingManager:
      - fix safe comparison between floating numbers
      - added check for primary track outside of the world
      - bug fix for particles below threshold to avoid double steps

  o Visualization:
    -------------
  - Corrected handling for already open file in HepRepXMLWriter.

  o Examples:
    --------
  - Novice: syncronised files with CVS HEAD. No functional changes to code.

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

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

  o  Technical notes distributed for release 4.0 are also applicable and valid
     for this patch.

The code and rebuilt binary libraries for release 4.0 are available through
our "Source Code" Web page:
- see our Geant4 Home 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.