$Id: History,v 1.12 1999/11/17 07:45:14 stanaka Exp $
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     =========================================================
     Geant4 - an Object-Oriented Toolkit for Simulation in HEP
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                      Category History file
                      ---------------------
This file should be used by G4 developers and category coordinators
to briefly summarize all major modifications introduced in the code
and keep track of all category-tags.
It DOES NOT substitute the  CVS log-message one should put at every
committal in the CVS repository !

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     * Reverse chronological order (last date on top), please *
     ----------------------------------------------------------

17th November 1999 Satoshi Tanaka (greps-V00-01-01)
- Header comments for software reference manual

4th October 1999  John Allison  (greps-V00-01-00)
- Improved comments in G4Visible.hh.

23rd July 1999  John Allison
- Added base class copy to copy contructor of G4Polyhedron.

21st July 1999  John Allison
- Added G4PlacedPolyhedron, which includes G4PlacedPolyhedronList.

greps-01-00-08  5th June John Allison
- Added virtual operator = and overrides to G4Circle and G4Square.

greps-01-00-07  25th May 1999  John Allison
- Moved operator != to member function.

greps-01-00-06  19th May 1999  John Allison
- Fixed compilation warnings, mainly overriding virtual functions.

greps-01-00-05  12th May 1999  John Allison
- Made destructors virtual where applicable.

greps-01-00-04  28th April 1999  John Allison
- Moved G4VVisManager and G4VGraphicsScene to intercoms.

greps-01-00-03  7th February 1999  John Allison
- Removed GNU_GCC from G4Polymarker.cc.
- Added G4VGraphicsScene::AddThis (G4Polycone and G4Polyhedra.

greps-01-00-02  6th January 1999  John Allison
- Very minor change in G4VisExtent.cc - 2 -> 2.
- Inclusion of test/ in tag.

greps-01-00-01  6th January 1999  John Allison
- Corrected constructors of G4VisAttributes for initialisation of
  fDaughtersInvisible.

greps-00-04-02 02 December 1998 Evgeni Tcherniaev
- Added G4NURBS::CalcPoint() for calculation coordinates of a
point lying on the nurbs surface.

greps-00-04-01  25th November 1998  John Allison
- Added void G4VisAttributes::SetDaughtersInvisible (G4bool).

greps-00-03-03  9th November 1998 Satoshi Tanaka
Added G4String fInfo and its access functions to G4VMarker

greps-00-03-02  6th November 1998  John Allison
- Cleaned up GNUmakefile - no longer includes unnecesary -I's

greps-00-03-01  26th September 1998  John Allison
- Removed SetWorldVolume from G4VVisManager - no longer used.

greps-00-02-03  21st August 1998  John Allison
- Rationalised G4VisExtent::G4VisExtent (const G4Point3D& centre,
  G4double radius) so that iit is a true "inverse" of GetExtentRadius.
- Added global target to GNUmakefile (Gabriele Cosmo).

greps-00-02-02  14th August 1998  John Allison
- Added GeometryHasChanged() to G4VVisManager.  To be used by the run manager.

greps-00-02-01  6th August 1998  John Allison
- Removed Draw, ClearView and Show in G4VVisManager.

greps-00-06-03  26th June 1998  Gabriele Cosmo
- Updated test/GNUmakefile to new electromagnetics.

greps-00-06-02  10th June 1998  John Allison
- Changed defaults in G4VisExtent to 0.

1st June 1998  Satoshi Tanaka
- Added Draw(), ClearView(), Show() to G4VVisManager.

greps-00-06-01  29th April 1998  John Allison
- Introduced Establish/DecommissionSpecials (G4PhysicalVolumeModel&)
  in place of BeginModeling (G4PhysicalVolumeModel&).

April 21st, 98 G.Cosmo (greps-00-05-03)
- Tagged.

April 9th, 98 G.Cosmo
- Porting on DEC-cxx 6.0.
  Removed meaningless usage of "const" qualifier from functions
  return type for basic types by value. Modified files: G4NURBS.cc

greps-00-05-02  4th April 1998  John Allison
- Re-engineered maintenance of current depth, etc.  Needed new method
  G4VGraphicsScene::BeginModeling (G4PhysicalVolumeModel&) in
  graphics_reps.  The result is much cleaner model and modeling
  parameters classes.  Also, the current depth, physical volume and
  logical volume are immediately available as protected pointers in
  G4VScene.

HEAD  3rd April 1998  John Allison
- Added GetWorld/ScreenDiameter/Radius to G4VMarker.

April 2, 1998 G.Barrand :
- G4Polyhedron.cc : add a G4double cast to help NT/Visual compiler.

greps-00-05-01  26th March 1998  John Allison
- Removed #if defined(__DECCXX) || defined(WIN32) from G4NURBS.hh.
- Improved comments in G4VMarker.hh

7th January 1998  John Allison
- Added arguments to PreAddThis in G4VGraphicsScene.hh.
- Added virtual destructor to G4VVisManager.

December 19, 97 G. Cosmo - (alpha03)

- Created.

- Previous history (from README)

vis-00-01-02  13th July 1997  John Allison
- Consolidation of previous tag.

vis-00-01-01  8th June 1997  John Allison
- First systematic tag.
- G4Polyhedron - can now set number of sides for circle polygon approximation
