Add example to convert a globally re-aligned geometry to Geant4

examples/AlignDet/scripts/AlephTPC.py

+
+# ==========================================================================
+#  AIDA Detector description implementation
+# --------------------------------------------------------------------------
+# Copyright (C) Organisation europeenne pour la Recherche nucleaire (CERN)
+# All rights reserved.
+#
+# For the licensing terms see $DD4hepINSTALL/LICENSE.
+# For the list of contributors see $DD4hepINSTALL/doc/CREDITS.
+#
+# ==========================================================================
+#
+#
+from __future__ import absolute_import, unicode_literals
+import os
+import time
+import DDG4
+from DDG4 import OutputLevel as Output
+from g4units import GeV, MeV, m, cm
+#
+#
+"""
+
+   dd4hep simulation example setup using the python configuration
+
+   @author  M.Frank
+   @version 1.0
+
+"""
+
+
+def run():
+  args = DDG4.CommandLine()
+  kernel = DDG4.Kernel()
+  install_dir = os.environ['DD4hepExamplesINSTALL']
+  kernel.loadGeometry(str("file:" + install_dir + "/examples/AlignDet/compact/AlephTPC.xml"))
+
+  if args.alignments:
+    kernel.loadXML(str("file:") + str(args.alignments))
+
+  DDG4.importConstants(kernel.detectorDescription(), debug=False)
+  geant4 = DDG4.Geant4(kernel, tracker='Geant4TrackerCombineAction')
+  geant4.printDetectors()
+  # Configure UI
+  if args.macro:
+    ui = geant4.setupCshUI(macro=args.macro)
+  else:
+    ui = geant4.setupCshUI()
+  if args.batch:
+    ui.Commands = ['/run/beamOn ' + str(args.events), '/ddg4/UI/terminate']
+
+  # Configure field
+  geant4.setupTrackingField(prt=True)
+  # Configure Event actions
+  prt = DDG4.EventAction(kernel, 'Geant4ParticlePrint/ParticlePrint')
+  prt.OutputLevel = Output.DEBUG
+  prt.OutputType = 3  # Print both: table and tree
+  kernel.eventAction().adopt(prt)
+
+  generator_output_level = Output.INFO
+
+  # Configure G4 geometry setup
+  seq, act = geant4.addDetectorConstruction("Geant4DetectorGeometryConstruction/ConstructGeo")
+  act.DebugMaterials = True
+  act.DebugElements = False
+  act.DebugVolumes = True
+  act.DebugShapes = True
+  seq, act = geant4.addDetectorConstruction("Geant4DetectorSensitivesConstruction/ConstructSD")
+
+  # Setup particle gun
+  pos = (0.0, 0.0, -364.0 * cm)
+  gun = geant4.setupGun("Gun", particle='e+', energy=50 * GeV, multiplicity=1, position=pos)
+  gun.OutputLevel = generator_output_level
+
+  # And handle the simulation particles.
+  part = DDG4.GeneratorAction(kernel, "Geant4ParticleHandler/ParticleHandler")
+  kernel.generatorAction().adopt(part)
+  part.SaveProcesses = ['Decay']
+  part.MinimalKineticEnergy = 100 * MeV
+  part.OutputLevel = Output.INFO  # generator_output_level
+  part.enableUI()
+  user = DDG4.Action(kernel, "Geant4TCUserParticleHandler/UserParticleHandler")
+  user.TrackingVolume_Zmax = 3.0 * m
+  user.TrackingVolume_Rmax = 3.0 * m
+  user.enableUI()
+  part.adopt(user)
+
+  geant4.setupTracker('TPC')
+
+  # Now build the physics list:
+  phys = geant4.setupPhysics('QGSP_BERT')
+  phys.dump()
+  geant4.execute()
+
+
+if __name__ == "__main__":
+  run()