o2::field::MagneticWrapperChebyshev class allows to dump the field data to text file and recreate it back as a ROOT object from this file. This is useful if one needs to change the name or the namespace of this class or persistent classes it usese internally (e.g. MathUtils/Chebyshev3D.h, MathUtils/Chebyshev3DCalc.h)

• macro extractMapsAsText.C

Converts all magnetics field objects of MapClass in the inpFileName file to text files named as <map_name> in current directory, e.g. root -b -q 'extractMapsAsText.C+("$O2_ROOT/share/Common/maps/mfchebKGI_sym.root")'

• macro createMapsFromText.C

Converts all text files with name pattern <path>/<prefix>* to magnetic field object of MapClass and stores them in the outFileName root file, e.g. root -b -q 'createMapsFromText.C+' will create local mfchebKGI_sym.root, which can substitute O2/Common/maps/mfchebKGI_sym.root file.

Currently the MapClass is aliased to o2::field::MagneticWrapperChebyshev in both cases. If after extractMapsAsText.C macro the name of the underlying MapClass changes, this has to be reflected in the createMapsFromText.C