IOdictionary propsDict(systemDict("particleTracksDict", args, runTime))
label maxPositions(propsDict.lookup< label >("maxPositions"))
label sampleFrequency(propsDict.lookup< label >("sampleFrequency"))
const word cloudName(propsDict.lookup("cloudName"))
word setFormat(propsDict.lookupOrDefault< word >("setFormat", "vtk"))