G4FastSimulationHelper.cc

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#include "G4FastSimulationHelper.hh"
 
#include "G4FastSimulationManagerProcess.hh"
#include "G4ProcessManager.hh"
 
void G4FastSimulationHelper::ActivateFastSimulation(G4ProcessManager* pmanager,
                                                    G4String parallelGeometryName)
{
  G4FastSimulationManagerProcess* fastSimProcess;
  if (parallelGeometryName.empty()) {
    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);
  }
  else {
    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);
  }
  // If 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.
 
  // 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);
}