Geant4 7.1 Release Notes

June 30th, 2005

The code and binary libraries for the supported systems are available through our Source Code Web page.

Please refer to the Geant4 User Documentation for further information about using Geant4.

Contents

1. Supported and Tested Platforms
2. AIDA and CLHEP
3. Known Run-Time Problems
4. Compilation Warnings
5. Known Run-Time Warnings
6. Items for migration of the user code
7. Detailed list of changes and fixes

1. Supported and Tested Platforms

• SUN Solaris 5.8, C++ CC-5.4 Patch 111715-02.
• Linux, gcc 3.2.3.
  This configuration was tested on 32 bits architectures (Intel) and 64 bits architectures (AMD) with the Scientific Linux CERN 3 (SLC3) distribution (based on RedHat Linux Enterprise 3). Versions of Geant4 have also been compiled successfully on other Linux distributions, like Debian, Suse or other RedHat systems.
• Windows/XP and CygWin Tools with: Visual C++ 7.1 .NET

• SUN Solaris 5.8, C++ CC-5.5
• Linux, gcc-3.4.3, gcc-3.4.4, gcc-4.0.0
• Linux, Intel-icc 8.0
• MacOS 10.3, gcc-3.3
• MacOS 10.4, gcc-4.0

• AIX 4.3.2, xlC 6.0
• DEC V4.0, cxx C++ V6.1-027
• HP 10.20, aCC C++ B3910B A.01.23
• SGI V6.5.5, CC 7.2.1

2. AIDA and CLHEP

• PI and included components
• JAS (Java Analysis Studio)
• Open Scientist

3. Known Run-Time Problems and Limitations

4. Compilation Warnings

5. Known Run-Time Warnings

    G4PropagateInField: Warning: Particle is looping 
    -  tracking in field will be stopped. 
       It has performed 1000 steps in Field while a maximum of 1000
       are allowed. 

6. Items for migration of the user code

• G4LIB_BUILD_ZLIB, G4LIB_USE_ZLIB: building the zlib file compression module has now become optional. It is not required on UNIX-like platforms where the built-in zlib library is used, while it is optional on Windows where it is disabled by default.
• G4LIB_BUILD_G3TOG4, G4LIB_USE_G3TOG4: now required to build and use the optional g3tog4 module.

7. Detailed list of changes and fixes

• Configure script:
  • Now setting a unique entry point for path to data; added also settings for new data sets (low-energy-EM and elastic-scattering).
  • Updated variable settings for G3toG4 module and zlib.
  • Corrected text where necessary.
• Added printout of Geant4 version at build startup and removed verbose output from libmap stage.
• Modified clean targets to allow multiple clean rules.
• Setup variables:
  • Changed G4USE_G4TOG4 to G4LIB_USE_G3TOG4 to be consistent with the rest of configuration variables. Now G4LIB_BUILD_G3TOG4 is required in order to build the G3toG4 module.
  • Added G4LIB_BUILD/USE_ZLIB flags:
    • G4LIB_BUILD_ZLIB is mandatory for Windows, if zlib is required;
    • if G4LIB_BUILD_ZLIB is set, the Geant4 zlib module is used (all platforms);
    • if only G4LIB_USE_ZLIB is set, the system built-in zlib is used (UNIX only);
    • if none is set, zlib is not used (all platforms).
• Changed configuration for OPENGLXM to explicitely require OPENGLX.
• System configurations:
  • SUN-CC: removed obsolete compilation option for redirection to template repository, no longer necessary, and added -lsunmath to LOADLIBS now required with CLHEP-1.9.X for static libraries.
  • Darwin-g++: updated compilation options, now similar to Linux-g++ setup.

• G4VHit: fixed interface to CreateAttValues(), removed const qualifier.

• Included implementation of DNA elastic scattering in water.
• New low energy polarised Rayleigh scattering process: G4LowEnergyPolarizedRayleigh
• Fix to Penelope ionisation for atomic deexcitation.
• Fixed Sauter angular distribution in G4PenelopePhotoelectric.
• Minor fixes in: G4hICRU49Nuclear, G4hZiegler1985Nuclear and G4LowEnergyPolarizedCompton.
• Bug fix in AtomicDeexcitation concerning the Auger effect.
• Bug fix in PenelopeIonisation, addressing problem report #729.

• Utils & Standard
  • The photon processes (G4PhotoElectric, G4ComptonScattering, G4GammaConversion) and G4eplusnAnnihilation have been redesigned according to the process-model approach, like for the energy loss processes.
    The common base classes, G4VEmProcess and G4VEmModel, have been consequently upgraded. Physics results should be unchanged.
    The redesign is transparent to the user. 'Old' photon and positron processes have been frozen and kept for a while, under G4PhotoElectric52 ... etc ... See the class PhysListEmG4v52 in most of extended/electromagnetic examples and g4v52 alternative PhyicsList in physics_list/electromagnetic.
  • The class G4EmCalculator allows to access most of the basic quantities of electromagnetic processes: crossSections, meanFreePath, stoppingPower, csdaRange. It has been updated and can be applied to all standard processes. See examples in extended/electromagnetic RunAction for TestEm1, TestEm5 and TestEm11.
  • The limit of applicability of the model of energy loss straggling (G4UniversalFluctuation) has been reviewed and extended to smaller energy loss (~eV). This affects energy loss distributions for small steps (under micrometer).
  • The G4EmCorrections class has been introduced to provide corrections to energy loss of hadrons and ions. With the standard package, stopping power for protons and alpha particles are within 2% with the Nist data, from 1 keV to 100 GeV for all atoms.
• Muons
  • A new class G4EnergyLossForExtrapolator has been introduced. This class provides calculation of average energy loss and its dispersion for the step of charged particles in media. It also provides average angle of multiple scattering. This class is working independently of the Geant4 event loop and does not require Run, Event and Stepping managers. It requires only particles and materials instantiation.
• HighEnergy
  • Two new models G4BetheBlochNoDeltaModel and G4BraggNoDeltaModel are released; they can be used for the simulation of exotic heavy ionizing objects (monopoles ..etc..).
• Xrays
  • Updated TRD model for regular radiator, to provide more realistic gamma spectrum. Added G4StrawTubeXTRadiator and modified the integration algorithm in G4TransparentRegXTRadiator.

• Extended G4PrimaryTransformer to accept exotic particles, to take care of mass defined in G4PrimaryParticle and to accept shortlived primary particles with proper decay table. Also issueing a warning message if a shortlived primary does not have decay table nor pre-assigned decay mode. Added also a new virtual method to alter the conversion of such shortlived into a track.
• Modified G4ParticleGun and G4ParticleGunMessenger to accept shortlived primary particle with proper decay table.
• Moved G4PrimaryParticle, G4PrimaryVertex, G4VUserPrimaryParticleInformation, and G4VUserPrimaryVertexInformation to 'particles' category.
• Fixed bug for particle weight in G4SingleParticlesource.

• Decay
  • Fixed bug in G4Decay::AtRestGetPhysicalInteractionLength(). Condition is now fixed to Not Forced.
• Transportation
  • Made destructors virtual for G4StepLimiter and G4UserSpecialCuts.
  • Added process type to G4Transportation. Addresses problem report #743.

• Management
  • Extended G4Region to hold G4UserLimits so that the information will be propagated as for the cuts; added access from G4LogicalVolume.
  • Added optional boolean argument propagate to GetMass() to avoid propagation of computation of masses to the daughter volumes on request. Propagation to daughters is done by default.
  • Extended signatures for OpenGeometry() and CloseGeometry() to consider local optimisation of a subtree of volumes. Voxelisation can now apply to just a specific subtree if a physical volume is specified.
  • Added protection against NULL material pointer for volumes belonging to the tracking geometry in G4Region scanning. Addresses problem report #735.
  • Updated implementation of GetPolyhedron() in G4ReflectedSolid.
  • Modified G4LogicalVolume::SetVisAttributes(const G4VisAttributes& VA) to now create a copy of VA on the heap. Temporary solution, until a proper 'store' for visualization attributes will be implemented to take care of the memory management.
• Solids
  • Implemented Get/CreatePolyhedron() where missing
  • Changed AddThis() with AddSolid() for all solids in DescribeYourselfTo().
  • Some code cleanup.
  • Boolean:
    • Fix in G4IntersectionSolid::DistanceToIn(p,v) to allow for correct simmetrical treatment of the solids' intersection. Algorithm reviewed as proposed in problem report #723.
    • Modified Inside(p) in G4SubtractionSolid and G4UnionSolid, to fix inconsistency for non-zero sum of surface-normals. Now computing surface-normal for edges/vertices.
    • Use the newly available CreatePolyhedron() for components of Boolean solids, instead of GetPolyhedron().
  • CSG:
    • New implementation of SurfaceNormal(p) with edges/vertices. The implementation is now consistent with Inside(p) functions for the treatment of phi/theta surfaces, which are now treated in terms of kAngTolerance; the surface selection is made according to Inside(p) approach. The old specification is temporarily kept to treat exotic uses of the function for points not at the surface.
  • Specific:
    • New generic framework for twisted solids G4TwistedBox, G4TwistedTrd and G4TwistedTrap: inheriting now from a new base class G4VTwistedFaceted.
    • Extended G4TwistedTrap to support setups with different trapezoidal endcaps with centres not necessarily on a line parallel to the z axis.
    • G4TwistedSurface: fixed bug in GetAreaCode() affecting G4TwistedTubs.
• Volumes
  • Made constructors/destructors and operators for G4NavigationLevelRep and G4NavigationLevel not inlined. Rationalised definition of allocators to belong to related translation units. Workaround necessary to allow for correct optimisation on some compilers on 64-bits systems.

• Migrated calls to G4Exception in HEPNumerics to canonical signature.
• Q/A cleanup to clear CodeWizard warnings, minor fixes and moved inline methods to .icc files.
• Added G4BestUnit::operator G4String in G4UnitsTable.
• Added new class G4AnalyticalPolSolver in HEPNumerics module, implementing the CACM algorithm for solving analytically a polynomial equation up to the 4th order.

• HepPolyhedron: added method IsErrorBooleanProcess(). and BooleanProcessor::get_processor_error().
• Implementation improvements in G4VisExtent, G4Polyhedron, and G4VisAttributes. Added new class G4AttCheck.

• New public interface to build elements and materials, based on the Nist materials data base. In particular one can easily define an element with its natural isotope composition. About 300 materials are included into the Geant4 material DB.
  Examples are given in extended/electromagnetic examples TestEm9, TestEm11 and extended/medical/GammaTherapy.
  The material category is equipped by its messenger, which allows to access elements and materials from data-base.
• Made A optional in G4Isotope, now taken from Nist data base by default.
• Added new data member in G4Element to count the number of elements with same Z.
• Added SetGROUPVEL() to G4MaterialPropertiesTable. Addresses problem report #741.
• Trivial fix in G4IonisParamMat::FindMeanExcitationEnergy(). Addresses problem report #746.

• cross_sections:
  • Cleared compilation warnings in G4EMDissociationCrossSection.
• management:
  • Checking for NaN at input to PostStepDoit() method.
  • Corrected treatement of momentum balance for elastic scattering final states.
  • Isotope production code now also provides name of producing model.
• models/abrasion:
  • Pointers to theAbrasionGeometry and products generated by the deexcitation handler deleted to prevent memory leaks. Also particle change of projectile fragment previously not properly defined.
• models/cascade/cascade:
  • Added kaon extension to Bertini cascade. Currently, in order to compile the new code, the conditional assembly flag G4BERTINI_KAON must be set.
  • Fixed compilation warnings on gcc-4.0.0.
• models/chiral_invariant_phase_space:
  • Adapted interface to 'body' module as to not simulate heavy fragments.
  • Physics tuning for the antiproton-nuclear annihilation at rest.
  • Corrected error in hypernuclear degradation to normal nuclear fragment (1 per 5 millions interactions on Al).
  • Fixed bug in G4QEnvironment::EvaporateResidual() observed on SUN. Return statement added in the end of recursive void function.
  • Cleared warnings after QGSC test for 30.E6 interactions of protons.
  • Fix for uninitialised G4QPDGCode in "interface module".
• models/coherent_elastic:
  • New implementation of high energy coherent elastic scattering, with substantial improvement of angular distributions for heavy materials and large scattering angles.
• models/de_excitation:
  • fermi_breakup: registration of fermi fragments made less redundant.
  • gem_evaporation: channel registration sequence simplified.
  • handler: fixed a small memory leak for light fragments.
• models/low_energy:
  • Fixed cases of very rare crashes for low energy strange particle interactions.
  • Fixed long standing bug in triton inelastic scattering (lead to platform dependence).
• models/management:
  • Removed obsolete classes.
• models/parton_string/qgsm:
  • Improved baryon splitting and removed InelasticSplitableHadron now no longer needed.
  • Fixed compilation warnings on gcc-4.0.0 and some code cleanup.
• models/pre_equilibrium:
  • Performance optimization by means of reshuffling channels.
• models/radioactive_decay:
  • Added tests to avoid cosine rounding errors in G4NuclearDecayChannel.
  • Minor correction to G4NuclearDecayChannel to fix bug #711.
• models/util:
  • Some code cleanup.

• GFlashShowerModel: fixed compilation warning on gcc-4.0.0 for possible undefined operations and warnings on SUN-CC for hiding of class attributes.
• Corrected signature for IntegrateNspLongitudinal() in implementation of GFlashHomoShowerParamterisation, to remove const qualifier. Problem detected on SUN-CC.

• Changed default value of mass of G4PrimaryParticle from 0 to -1 and added GetPDGcode() method.
• Added neutrino energy spectrum in G4MuonDecayChannel.
• Moved G4PrimaryParticle, G4PrimaryVertex, G4VUserPrimaryParticleInformation and G4VUserPrimaryVertexInformation from event category to management module.

• Intercoms:
  • Modified G4UIbatch so that it now aborts the execution of the macro file (and any other parent macro files which issued this macro file) if a command in the macro file is wrong or cannot be executed. Fixes problem report #734.
  • Migration from AddThis() to AddSolid() and AddCompound().
  • G4VGraphicsScene: introduced new names. Old methods call new methods as interim solution.
  • G4VVisManager::Draw(): removed default argument.
• Interfaces:
  • G4UIGainServer: fixed conditional compilation for porting on MacOS 10.4.
• Run:
  • Messages about defined particles and physics tables are now printed out only for verbose level greater than 1.
  • Moved invocation of ConstructParticle() method back to the original place in InitializePhysics().
  • Added SetPrimaryTransformer() method to G4RunManager and G4RunManagerKernel.
  • Changed version string in G4RunManagerKernel not to have CVS symbols.

• Track
  • Added new class G4ParticleChangeForGamma.
  • Fix in G4Track::GetVelocity(). Addresses problem report #741.
  • Modified G4ParticleChangeForLoss to inline 'update' methods.
• Tracking
  • Simplified creation of G4AttValues using G4BestUnit::operator G4String() and G4UIcommand::ConvertToString().
  • Changed Trajectory classes to make use of G4AttCheck.
  • Removed redundant declaration of SetNavigator() method. Addresses problem report #742.

• HepRepFile
  • Providing more efficient representation of many solids (reduces typical geometry file sizes by half).
  • Allow user to specify output directory and filename.
  • Allow user to specify whether to append a file number to the file name or to overwrite a single file.
  • Allow user to specify whether or not invisible volumes should be culled from the HepRepFile.
  • Correctly respect trajectory color from G4VisAttributes.
  • Handling G4VisAttributes from hits.
  • Using G4AttCheck to standardize attribute units.
  • Decomposed attributes that are 3Vectors into three separate HepRep Attributes.
• HepRepXML
  • Fixed problems with sequential heprep files, gz files and too much info.
  • Fixes for compilation on gcc-4.0.0.
  • Moved to heprep version 2.0.1 and cheprep version 2.0.5.
  • Reorganised ZLIB and ZIPIOS++ code.
  • Providing more efficient representation of many solids.
  • Handling attributes on hits and trajectories.
• management
  • Introduced drawing of readout geometry for logical volumes. For drawing of logical volumes, introduced boolean flags to control drawing of: boolean components (if any), voxels (if any) and readout geometry (if any). Augmented commands /vis/specify and /vis/scene/add/logicalVolume to use above flags.
  • Migration from AddThis() to AddSolid() (method for adding solids to the scene handler) and AddCompound() (method for adding "compound" objects to the scene handler). These methods may either (a) invoke "user code" through G4VVisManager or (b) invoke AddPrimitives() or (c) use graphics-system-specific code or (d) any combination of the above.
  • Introduced G4VisExecutive. MyVisManager deprecated.
  • Added first implementation of cutaway: a clipping box for physical volume tree: vis/scene/add/volume ! ! ! box km 0 1 0 1 0 1.
  • G4VisCommandsViewerSet: made Up and Viewpoint vectors unit for safety.
  • G4VisManager: removed "Delete" methods. Removed "remove" and "edit" commands.
  • Reviewed all vis commands. Improved guidance, simplified and rationalised the commands.
  • Fixed UI command /vis/scene/add/text to accept text with spaces.
  • Reduced text size of scale annotation to 12 pixels.
  • Issue warning in G4ViewParameters for viewpoint direction close to up vector direction.
  • Fixed case of scene handler with no viewer in UI command /vis/scene/notifyHandlers.
  • Removed automatic parameter candidate specification for commands that take an argument that is a scene, scene handler or viewer name: it is checked in SetNewValue() methods.
  • Added G4VUserVisAction and G4CallbackModel classes.
  • Implemented /vis/scene/add/userAction and introduced /vis/scene/add/logo.
  • Protected scene handlers for the case of the drawing of solids NOT from a physical volume tree.
  • Improved physical volume clipping.
  • Fixed bug in /vis/viewer/update to check the existence of the scene handler and the scene.
• modeling
  • G4PhysicalVolumeModel: SetCopyNo of replicas and paramaterised volumes.
  • G4TextModel: improved global tag for better identification.
  • G4PhysicalVolumeModel: fixed case of off-origin volume and handling of rotation steps.
• OpenGL
  • G4OpenGLViewer: created virtual void CreateFontLists(). In all concrete viewers, added call to CreateFontLists(). Moved font code for X to G4OpenGLXViewer::CreateFontLists().
  • There is no longer a need to implement in the XmViewer, since it now inherits. Thus the font code now only appears once for X.
  • Restored sequence Set/Clear/DrawView in ClearTransientStore(). Fixed bug for views not refreshed.
• OpenInventor
  • Implemented marker sizes.
  • Changed char* to const char* in gl2psMsg.
  • Removed extra ';' for porting on gcc-3.4.X and higher.
  • G4OpenInventorTransform3D: use CLHEP::Transform3D::operator(i,j) in order to be compatible with new versions of CLHEP.
• Tree
  • Changed ASCIITree to use G4VSolid::GetCubicVolume() and G4LogicalVolume::GetMass(); added printing of names of sensitive detector (if any) and readout geometry (if any).
  • Improved ASCIITree guidance.
• XXX
  • Removed scene count and included some ongoing developments to do with making a consistent geometry hierarchy in presence of culled volumes.
  • Fixed some compilation warnings.

• electromagnetic: changed gamma and e+ classes in G4EmQEDBuilder52.

• Fixed initialisation local pointer variable in G3toG4BuildTree::G3toG4BuildPVTree().

• New data set for low-energy EM processes: G4EMLOWEN-3.0.
• New data set for elastic scattering: G4ELASTIC-1.1.

• Updated reference outputs.
• Changed VisManagers in all examples making use of visualization to now adopt G4VisExecutive.
• advanced
  • air_shower
    • Corrected usage of <strstream> in RunActionMessenger.
    • Corrected call to Visualisation.mac from main. Changed viewer to OGLSX.
    • Updated README.
  • brachytherapy
    • Updated README and tested with AIDA 3.2.1 and PI-1.3.3.
  • cosmicray_charging
    • Fixed trivial compilation error on gcc-3.4.X (double semicolon).
  • gammaray_telescope
    • Minor changes to macro files.
  • hadrontherapy
    • Optimisation of the detector construction and sensitive detector
    • Introduced modular physics and added hadronic physic list for proton and ion.
    • Corrected bug in the modulator wheel.
    • Code review, removed warnings and deleted public variables.
    • Tested analisys with AIDA 3.2.1 and PI 1.3.3.
  • medical_linac
    • Fixed bug in ROGeometry.
    • Code review.
  • radioprotection
    • Code review and tested with AIDA 3.2.1 and PI-1.3.3.
  • Rich
    • Replaced <iostream.h> with <iostream> and cout with G4cout.
  • Tiara
    • Migration to SLC3 with latest versions of PI 1.3.X.
  • xray_fluorescence
    • Added new developments and tested with PI-1.3.3.
• extended
  • analysis/A01
    • Fixed linking problem with AIDA on WIN32-VC.
    • Added G4Atts to hits so that one can see them if hits are picked in WIRED.
    • Fixed filling of hit histograms.
    • Updated documentation for the use of Binary HepRep.
    • Added setting of initial viewpoint to macro files.
    • Added bheprep example files.
  • biasing/B02
    • Migration to SLC3 with latest versions of PI 1.3.X.
  • biasing/B03
    • Migration to SLC3 with latest versions of PI 1.3.X.
  • electromagnetic/TestEm1
    • PhysListEmStandard: use G4eBremsstrahlung from the standard; removed G4eBremsstrahlungCMS. Treat Alpha as GenericIon.
    • Removed He3 from predefined particles.
    • HistoManager: added option --noErrors for hbook files.
    • PhysListEmG4v52: old photon processes and eplusAnnihilation marked as 52.
  • electromagnetic/TestEm2
    • HistoManager: added protection for the creation of the analysis factory.
    • Migration to model version of gamma processes.
    • RunAction: added option --noErrors for hbook files.
  • electromagnetic/TestEm3
    • HistoManager: added protection for the creation of the analysis factory; file extension is fileType.
    • HistoMessenger: new command setFileOption.
    • Removed He3 from predefined particles.
    • PhysListEmStandard: treat Alpha as GenericIon.
    • RunAction: added option --noErrors for hbook files.
    • Forward and backward energy flow in SteppingAction + RunAction.
  • electromagnetic/TestEm4
    • RunAction: added protection for the creation of the analysis factory and option --noErrors for hbook files.
  • electromagnetic/TestEm5
    • HistoManager: added protection for the creation of the analysis factory; file extension is fileType.
    • HistoMessenger: new command setFileOption.
    • Removed He3 and ionC12 from predefined particles, also from IonBinaryCascade.
    • PhysListEmStandard: treat alpha as GenericIon.
    • Added PhysListEmPenelope.
    • RunAction: added option --noErrors for hbook files.
    • PhysListEmG4v52: old photon processes and eplusAnnihilation.
  • electromagnetic/TestEm6
    • RunAction: added protection for the creation of the analysis factory.
    and added option --noErrors for hbook files.
  • electromagnetic/TestEm7
    • RunAction: added protection for the creation of the analysis factory and added option --noErrors for hbook files.
    • Removed He3 and ionC12 from predefined particles, also from IonBinaryCascade.
    • PhysListEmStandard: treat alpha as GenericIon.
    • PhysListEmG4v52: photon processes v52.
  • electromagnetic/TestEm8
    • Remove IonC12 class and unused headers.
    • Migration v70->standard->v52: PhysicsList and macros.
  • electromagnetic/TestEm9
    • Removed He3 and ionC12 from predefined particles, also from IonBinaryCascade.
    • PhysListEmStandard: treat alpha as GenericIon.
    • Migration to use NIST materials.
    • Removed SteppingVerbose class.
  • electromagnetic/TestEm11
    • New example showing handling of energy deposited by particles in material and illustrating how to use the concept of 'process' in order to implement a constraint on the step size of the particle trajectories.
  • electromagnetic/MuonProcesses
    • HistoManager: added protection for the creation of the analysis factory; file extension is fileType, and added option --noErrors for hbook files.
  • electromagnetic/PhotonProcesses
    • HistoManager: added protection for the creation of the analysis factory; file extension is fileType, and added option --noErrors for hbook files.
    • HistoMessenger: new command setFileOption.
    • Migration v70->standard->v52: PhysicsList and macros.
    • Use EmCalculator in RunAction.
  • medical/DICOM
    • Revision and bug fixes.
  • medical/GammaTherapy
    • Return back killing electrons in the gas volume.
    • Migrated to use NIST materials and "ApplyCuts" option.
    • Bug fix in UI for step-limiter.
  • optical/LXe
    • Fixed a material dependent parameter input.
  • paralled
    • Added missing directories with annotated files in ParN02 and ParN04.
    • Added text description.
  • persistency
    • Brought code up-to-date to compile with current Geant4 kernel and configuration setup.
  • radioactivedecay/exrdm
    • Updated physics list and added macro test.mac for testing it.
  • runAndEvent/RE01
    • Added visualization.
    • Added G4Atts to hits so that one can see them if hits are picked in WIRED.
• novice
  • N02
    • Uncommented G4UserLimits + G4StepLimiter.
    • ExN02TrackerHit: changed screen size to 2 pixels.
  • N03
    • Decreased size of trajectory points in EventAction.
  • N06
    • Use SetProcessOrdering() for the decay process.