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      Geant4 - an Object-Oriented Toolkit for Simulation in HEP
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                             Example TextGeom
                             ----------------
 
 This example illustrates the use of the text geometry. 
 
 1.- GEOMETRY EXAMPLES
 
 Several examples of text geometries are provided:
 
 g4geom_simple.txt :
 - Simple construction of materials and single placements 
 
 g4geom_matemixt.txt :
 - Isotopes, elements and materials
 
 g4geom_boolean.txt :
 - Boolean solids
  
 g4geom_reflections.txt :
 - Reflections
 
 g4geom_replicas.txt :
 - Replicas
 
 g4geom_divisions.txt :
 - Divisions
 
 g4geom_paramLinear.txt :
 - Linear parameterisations
 
 g4geom_paramSquare.txt :
 - Square parameterisations
 
 g4geom_assembly.txt : 
 - Assembly placements
 
         
 2.- HOW TO START ?
  
     - execute textGeom in 'batch' mode from macro file 
        % textGeom run.mac
                 
 It will read the geometry from a file named 'g4geom.txt', and it will create a
 VRML2 file to visualise the geometry.
 Therefore if you want to try any of the above-mentioned files, copy it to a
 file with this name,
 
         
 3.- DEFINING A SENSITIVE DETECTOR
 
 The detector construction class ExTGDetectorConstructionWithSD shows how to
 access a volume of the text geometry and assign to it a sensitive detector.
 To use it, replace at exampleTextGeom.cc the line
 
   runManager->SetUserInitialization(new ExTGDetectorConstruction);
 
 by
 
   runManager->SetUserInitialization(new ExTGDetectorConstructionWithSD);
 
 and recompile.
 
 It will use the geometry from the file 'g4geom_SD.txt'
 
 
 4.- MIXING TEXT AND C++ GEOMETRIES   
 
 The detector construction class ExTGDetectorConstructionWithCpp shows how to
 create a volume with C++ and place it in the world or inside a volume defined
 in the text geometry.
 To use it, replace at exampleTextGeom.cc the line
 
   runManager->SetUserInitialization(new ExTGDetectorConstruction);
 
 by
 
   runManager->SetUserInitialization(new ExTGDetectorConstructionWithCpp);
 
 and recompile.
 
 It will use the geometry from the file 'g4geom_simple.txt'
 
 
 5.- CREATING NEW TAGS IN THE TEXT GEOMETRY: DEFINING CUTS PER REGION 
 
 The detector construction class ExTGDetectorConstructionWithCuts, together with
 ExTGRCLineProcessor, ExTGRCDetectorBuilder, ExTGRCRegionCutsMgr and
 ExTGRCRegionData show how to add a couple of tags, ':REGION' and ':CUT', that
 allow to define cuts per region in your input geometry text file. 
 To use it, replace at exampleTextGeom.cc the line
 
   runManager->SetUserInitialization(new ExTGDetectorConstruction);
 
 by
 
   runManager->SetUserInitialization(new ExTGDetectorConstructionWithCuts);
 
 and recompile.
 
 It will use the geometry from the file 'g4geom_cutsPerRegion.txt'
 
 
 6.- DUMP THE IN-MEMORY GEOMETRY TO TEXT FILE
 
 The run action 'ExTGRunAction' triggers the writing of the in-memory Geant4
 geometry to a text file. 
 To use it you just have to uncomment in exampleTextGeom.cc the line
 
  runManager->SetUserAction(new ExTGRunAction);
 
 and it will read the geometry from the file 'g4geom.txt' and will write the
 geometry in a file named 'geom.txt'

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