word setFormat(propsDict.lookupOrDefault< word >("setFormat", "vtk"))
label sampleFrequency(readLabel(propsDict.lookup("sampleFrequency")))
label maxPositions(readLabel(propsDict.lookup("maxPositions")))
IOdictionary propsDict(IOobject("particleTrackProperties", runTime.constant(), mesh, IOobject::MUST_READ_IF_MODIFIED))
const word cloudName(propsDict.lookup("cloudName"))