Gabriele Cosmo
60 lines
2.7 KiB
Plaintext
60 lines
2.7 KiB
Plaintext
$Id: README,v 1.9 2006/07/24 15:32:13 witoldp Exp $
|
|
-------------------------------------------------------------------
|
|
|
|
=========================================================
|
|
Geant4 - an Object-Oriented Toolkit for Simulation in HEP
|
|
=========================================================
|
|
|
|
GDML read/write
|
|
---------------
|
|
|
|
This example demonstrates the usage of the GDML reader and writer. It allows
|
|
to export geometry descriptions in an application independent format (GDML,
|
|
Geometry Description Markup Language).
|
|
The GDML files can be then used to interchange geometries between different
|
|
applications and users.
|
|
|
|
The detector construction consists of a call to GDMLProcessor which parses the
|
|
GDML file (test.gdml) and returns the pointer to the world volume. The user
|
|
can also write his/her own GDML file and use it as the primary input format for
|
|
his/her Geant4 application.
|
|
|
|
Once the Geant4 geometry is loaded in the memory, the G4GDMLWriter class is
|
|
instantiated (in the 'main') to demonstrate the exporting of the GDML file.
|
|
The call to DumpGeometryInfo method causes the GDML writer to scan the Geant4
|
|
geometry tree and write it out in the form of a GDML file.
|
|
|
|
HOW TO BUILD THE EXAMPLE ?
|
|
|
|
- Install the GDML package with the Geant4 binding as well as Xerces.
|
|
See: http://cern.ch/gdml.
|
|
|
|
- Set the environment variable GDML_INC to point to the directory where
|
|
GDML includes are installed and GDML_LIB to point to the directory
|
|
where GDML libraries are installed.
|
|
Set XERCESCROOT to point to place where Xerces is installed.
|
|
You can also edit the GNUmakefile provided with the example and
|
|
customise it for your specific setup.
|
|
|
|
- Compile and link to generate an executable:
|
|
% gmake
|
|
Note 1: GDML requires that all the Geant4 header files are copied to
|
|
one directory. You can use the Geant4 Configure script for coping
|
|
the Geant4 header files.
|
|
Note 2: new version of GDML (after GDML_2_5_0) have one additional
|
|
library called G4Evaluator. If you are compiling with older version
|
|
of GDML, you should remove that library from the makefile.
|
|
|
|
- You may need to customise the location of the GDML schema file which is
|
|
specified at the top of test.gdml file (the geometry file). By default
|
|
the schema will be loaded from the web server of LCG release area, however,
|
|
you can load your own copy of the schema by specifying the path, like:
|
|
xsi:noNamespaceSchemaLocation="/home/me/MYGDML/src/GDMLSchema/gdml.xsd"
|
|
|
|
- Execute the application:
|
|
% g4_gdml_read_write
|
|
Note: if you are using dynamic libraries, you should add $GDML_LIB
|
|
and $XERCESCROOT/lib paths to the LD_LIBRARY_PATH directory (or
|
|
equivalent on your system).
|
|
|