Gabriele Cosmo
55 lines
2.3 KiB
Plaintext
55 lines
2.3 KiB
Plaintext
$Id: README,v 1.8 2006/06/19 09:48:18 witoldp Exp $
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-------------------------------------------------------------------
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=========================================================
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Geant4 - an Object-Oriented Toolkit for Simulation in HEP
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=========================================================
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GDML read/write
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---------------
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This example demonstrates the usage of the GDML reader and writer. It allows
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to export geometry descriptions in an application independent format (GDML,
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Geometry Description Markup Language).
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The GDML files can be then used to interchange geometries between different
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applications and users.
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The detector construction consists of a call to GDMLProcessor which parses the
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GDML file (test.gdml) and returns the pointer to the world volume. The user
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can also write his/her own GDML file and use it as the primary input format for
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his/her Geant4 application.
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Once the Geant4 geometry is loaded in the memory, the G4GDMLWriter class is
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instantiated (in the 'main') to demonstrate the exporting of the GDML file.
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The call to DumpGeometryInfo method causes the GDML writer to scan the Geant4
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geometry tree and write it out in the form of a GDML file.
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HOW TO BUILD THE EXAMPLE ?
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- Install the GDML package with Geant4 extensions and Xerces.
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See: http://cern.ch/gdml.
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- Set the environment variable GDML_INC to point to the directory where
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GDML includes are installed and GDML_LIB to point to the directory
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where GDML libraries are installed.
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Set XERCESCROOT to point to place where Xerces is installed.
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You can also edit the GNUmakefile provided with the example and
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customise it for your specific setup.
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- Customise the 'test.gdml' schema file, specifying in the top line the
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right path where to retrieve the main GDML schema file (step that will
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become automatic in future).
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- Compile and link to generate an executable:
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% gmake
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Note: new version of GDML (after GDML_2_5_0) have one additional
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library called G4Evaluator. If you are compiling with older version
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of GDML, you should remove that library from the makefile.
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- Execute the application:
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% g4_gdml_read_write
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Note: if you are using dynamic libraries, you should add $GDML_LIB
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and $XERCESCROOT/lib paths to the LD_LIBRARY_PATH directory (or
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equivalent on your system).
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