G4FastSimulationHelper.cc

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#include "G4FastSimulationHelper.hh"

#include "G4ProcessManager.hh"
#include "G4FastSimulationManagerProcess.hh"

void G4FastSimulationHelper::ActivateFastSimulation(G4ProcessManager* pmanager)
{
  G4FastSimulationManagerProcess* fastSimProcess = new G4FastSimulationManagerProcess("fastSimProcess_massGeom");
  // -- For the parametrisation envelope belonging to the mass geometry case, the G4FastSimulationManagerProcess
  // -- is a PostStep process, and ordering does not matter:
  pmanager-> AddDiscreteProcess(fastSimProcess);
  // It is, however, possible that parametrisation happens in the mass geometry, but the parallel world
  // exists (with parallel world physics), e.g. for the sensitive detector.
  // In that case make sure fast simulation is the first process to be checked by the steppping manager
  // (highest ordering) so that user can kill the particle and/or deposit energy, ignoring other processes.
  // Otherwise the parallel world physics (which is a StronglyFroced process) will invoke a PostStepDoIt
  // on the same step, leading to e.g. duplicated energy deposits.
  pmanager->SetProcessOrderingToLast(fastSimProcess, idxPostStep);
}

void G4FastSimulationHelper::ActivateFastSimulation(G4ProcessManager* pmanager, G4String parallelGeometryName )
{
  G4FastSimulationManagerProcess* fastSimProcess = new G4FastSimulationManagerProcess("fastSimProcess_parallelGeom",
                          parallelGeometryName);
  // -- For the parallel geometry case, the G4FastSimulationManagerProcessz
  // -- is an Along+PostStep process, and ordering matters:
  pmanager->AddProcess(fastSimProcess);
  pmanager->SetProcessOrdering(fastSimProcess, idxAlongStep, 1);
  // Register as the process with highest ordering so it is checked as the first one,
  // and since it is exclusively forced no other process will be considered (to be invoked).
  pmanager->SetProcessOrderingToLast(fastSimProcess, idxPostStep);
}