Geant4 User's Guide for Application Developers - Geant4 - CERN

AppendixPython 2.6.2 (r262:71600, Oct 24 2009, 03:15:21)[GCC 4.4.1 [gcc-4_4-branch revision 150839]] on linux2Type "help", "copyright", "credits" or "license" for more information.>>> from Geant4 import **************************************************************Geant4 version Name: geant4-09-03(18-December-2009)Copyright : Geant4 CollaborationReference : NIM A 506 (2003), 250-303WWW : http://cern.ch/geant4*************************************************************Visualization Manager instantiating...>>>8.2.2. Access to Geant4 GlobalsWhen importing the Geant4 module, the G4RunManager object will be automatically instantiated. Geant4 singletonobjects are also automatically instantiated. These singleton objects can be accessed by "gXXXX" variables,like "gRunManager".gLossTableManager gTerminategApplyUICommand gMaterialTable gTrackingManagergControlExecute gNistManager gTransportationManagergElementTable gParticleIterator gUImanagergEmCalculator gParticleTable gVisManagergEventManagergProcessTablegExceptionHandler gProductionCutsTablegG4DategRunManagergG4VERSION_NUMBER gRunManagerKernelgG4VersiongStackManagergGeometryManager gStartUISessiongGetCurrentValues gStateManager8.2.3. Call Geant4 MethodsOnce a Python object of a Geant4 class instantiated, Geant4 methods can be directly called the same way as in C++.>>> from Geant4 import **************************************************************Geant4 version Name: geant4-09-03(18-December-2009)Copyright : Geant4 CollaborationReference : NIM A 506 (2003), 250-303WWW : http://cern.ch/geant4*************************************************************Visualization Manager instantiating...>>> print gRunManager.GetVersionString()Geant4 version Name: geant4-09-03 (18-December-2009)8.3. Site-modulesGeant4Py provides additional utility modules called "g4py" in the directory site-modules. It consists of predifinedgeometries, materials, physics lists, primary generator actions, and so on.8.3.1. ezgeom moduleThe ezgeom module provides an alternative way of defining simple geometry. An example code for defining asimple geometry is shown here:import g4py.ezgeomfrom g4py.ezgeom import G4EzVolumedef ConstructGeom():print "* Constructing geometry..."# reset world materialair= G4Material.GetMaterial("G4_AIR")g4py.ezgeom.SetWorldMaterial(air)305