IOdictionary systemDict(const word &dictName, const argList &args, const objectRegistry &ob, const word ®ionName=polyMesh::defaultRegion, const fileName &path=fileName::null)
IOdictionary propsDict(systemDict("particleTracksDict", args, runTime))
const word cloudName(propsDict.lookup("cloudName"))
List< word > userFields(propsDict.lookup("fields"))