1 | |
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2 | Examples for HepMC-Geant4 interface |
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3 | ----------------------------------- |
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4 | |
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5 | This directory contains examples for using HepMC as an interface with |
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6 | various Monte Carlo event generators, such as PYTHIA. |
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7 | It also include an example for demonstrating MC truth handling with HepMC. |
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8 | |
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9 | Requirements for external software packages |
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10 | ------------------------------------------- |
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11 | HepMC: |
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12 | tested version : 1.27.02 |
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13 | http://lcgapp.cern.ch/project/spi/extsoft/packages.php?pkg=HepMC |
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14 | http://cern.ch/mdobbs/HepMC/ |
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15 | |
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16 | Note: examples were tested only on Linux with gcc. |
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17 | |
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18 | PYTHIA |
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19 | Tested version 6.205 (CERNLIB 2005) |
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20 | URL: http://www.thep.lu.se/~torbjorn/Pythia.html |
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21 | |
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22 | |
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23 | Examples HepMCEx01 and HepMCEx02 |
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24 | ================================ |
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25 | |
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26 | class HepMCG4Interface |
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27 | This class is derived from G4VPrimaryGenerator, and is a base class |
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28 | for primary generation via HepMC object. |
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29 | |
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30 | protected members |
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31 | + virtual HepMC::GenEvent* GenerateHepMCEvent() |
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32 | Implement this method in his/her own concrete class. |
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33 | An empty event will be created in default. |
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34 | |
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35 | + void HepMC2G4(const HepMC::GenEvent* hepmcevt, G4Event* g4event) |
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36 | service method for conversion from HepMC::GenEvent to G4Event |
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37 | |
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38 | + virtual G4bool CheckVertexInsideWorld(const G4ThreeVector& pos) const |
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39 | We have to take care for the position of primaries because |
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40 | primary vertices outside the world volume give rise to G4Exception. |
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41 | If the default implementation is not adequate, an alternative |
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42 | can be implemented in your own class. |
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43 | |
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44 | public members |
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45 | + virtual void GeneratePrimaryVertex(G4Event* anEvent) |
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46 | The default behavior is that a single HepMC event generated by |
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47 | GenerateHepMCEvent() will be converted to G4Event through HepMC2G4(). |
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48 | |
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49 | class HepMCG4AsciiReader / HepMCG4AsciiReaderMessenger |
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50 | (derived from HepMCG4Interface) |
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51 | This derived class is for reading primary information from |
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52 | an Ascii file generated by HepMC. |
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53 | |
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54 | class HepMCG4PythiaInterface / HepMCG4AsciiReaderMessenger |
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55 | (derived from HepMCG4Interface) |
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56 | This derived class is for directly calling PYTHIA functions. |
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57 | Users can set parameters, initialize, generate, and terminate |
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58 | by command line operation. |
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59 | |
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60 | Macros in examples |
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61 | ----------------- |
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62 | hepmc_pygen.in |
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63 | process PYTHIA events(H->4mu) generated at every event. |
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64 | |
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65 | hepmc_ascii.in |
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66 | read pregenerated events from HepMC Ascii file (data/example_MyPhyia.dat). |
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67 | |
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68 | How to compile |
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69 | -------------- |
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70 | To build HepMCEx01 and HepMCEx02 examples, the directory path where the |
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71 | HepMC package is installed must be provided through the variable HEPMC_DIR. |
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72 | PYTHIA 6.205 must be installed through CERNLIB 2005 and the bin path |
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73 | correctly added in PATH. |
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74 | |
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75 | Notes |
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76 | ----- |
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77 | We attached a sample HepMC Ascii data file, "data/example_MyPhyia.dat", |
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78 | which contains 10 PYTHIA events created by "data/example_MyPythia.cxx(cc)". |
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79 | |
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80 | Example MCTruth |
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81 | =============== |
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82 | |
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83 | Application demonstrating handling of Monte-Carlo truth information through |
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84 | the HepMC package. |
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