shower <SDDSinputfile> -geometry=<GeometryDefinitionFile> -root=<string>
-summary[=<file>] [-defaultParticleType=<particleType>]
[-seedNumber=<integer>] [-samples=<integer>]
[-trajectories[=<file>]] [-vacuumStepSize=<distance-in-cm>] [-plotGeometry[=<file>]]
[-outOfBounds[=<file>]] [-undefinedRegion[=<file>]]
[-useInInput=<particleType>[,...]] [-keepInOutput=<particle-type>[,...]] [-verbose]
[-splitting] [-describeGeometryInput] [-fixLowEnergyTransport=[{0|1}]]
SDDSinputfile input file of initial coordinates of incident particles;
output files produced by previous shower runs are valid input files;
-geometry specifies file with geometry namelist commands defining materials;
-root string with which to construct default filenames;
-summary SDDS file containing summary data for each region; default name
is <root>.summary where <root> is the value of the -root option;
-defaultParticleType default particle type if not defined in input beam file;
<particleType> valid values are "electrons", "positrons", or "photons";
-seedNumber integer to initialize the random number generator;
-samples number of times to repeat the tracking of input file particles;
-trajectories file for storing shower trajectories; default name
is <root>.traj;
-vacuumStepSize maximum step size in vacuum;
-plotGeometry SDDS file containing line segments
defining solid regions edges;
-outOfBounds SDDS file containing coordinates of out-of-bounds particles;
default name is <root>.outOfBounds;
-undefinedRegion SDDS file containing coordinates of particles entering
undefined space; default name is <root>.undefinedRegion;
-useInInput select which particle type or types use (read) in particle
coordinate input file;
-keepInOutput select which particle type or types to keep (write) in particle
coordinate output files;
-splitting enables splitting of particle for improved statistics
as defined in the geometry definitions;
-describeGeometryInput prints out the namelist commands for the geometry input file
-fixLowEnergyTransport flag for enabling(1)/disabling(0) the maximum limit on the fractional
energy loss per step defined for each material in the geometry
input file. The default value is 1
-verbose spews verbiage
where square brackets enclose optional parameters.