G2ROOT(1)                   General Commands Manual                  G2ROOT(1)

NAME
       g2root - convert GEANT geometry files to ROOT files

SYNOPSIS
       g2rootd [-f map_name] geant_name macro_name

DESCRIPTION
       You can convert a GEANT (see http://geant.cern.ch/ fore more on GEANT)
       geometry to ROOT geometry with the following steps

       1      Run the interactive version of GEANT and produce a Zebra RZ file
              detector.geom, by typing the command:

              Geant > rz/file 21 detector.geom on


       2      Run the g2root program to convert the Zebra RZ file into a ROOT
              macro detector.C:

              g2root detector.geom detector.C


       3      Run the following ROOT session;

              root [1] .x detector.C
              root [2] detector.Draw()
              root [3] c1.x3d()   // (this invokes the 3-d Root viewer)
              root [4] TFile f("detector.root","NEW") //open a new root file
              root [5] detector.Write() //Write the geometry structure
              root [6] f.Write()

       Note that the TNode structure currently in ROOT was not designed as a
       replacement for a true geometry package. The idea was mainly to draw
       simple geometries in event display programs. We are currently
       investigating several alternatives for a true & efficient geometry
       package supporting;

       -      a disk data base with storage of multiple geometry versions

       -      an interactive editor and viewer

       -      with 3-d views

       -      but also 2-d cut views

       -      with interfaces to existing or future MC such as GEANT3 or
              GEANT4

       A second program called gh2root (see
       http://root.cern.ch/root/gh2root.html) generates automatically C++ code
       corresponding to the GEANT3 Zebra structures JSET, JVERTX, JKINE, JHITS
       and JDIGI.

SEE ALSO
              root(1), h2root(1),
       and
              The ROOT Users Guide
       available from the main ROOT website:
              http://root.cern.ch

ORIGINAL AUTHORS
       The ROOT team (see web page above):
              Rene Brun and Fons Rademakers

COPYRIGHT
       This library is free software; you can redistribute it and/or modify it
       under the terms of the GNU Lesser General Public License as published
       by the Free Software Foundation; either version 2.1 of the License, or
       (at your option) any later version.

       This library is distributed in the hope that it will be useful, but
       WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
       Lesser General Public License for more details.

       You should have received a copy of the GNU Lesser General Public
       License along with this library; if not, write to the Free Software
       Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
       USA

AUTHOR
       This manual page was written by Christian Holm Christensen
       <cholm@nbi.dk>, for the Debian GNU/Linux system (but may be used by
       others).

ROOT                               Version 3                         G2ROOT(1)