Convert Mantid IDF to MCViNE instrument xml

First make sure the instrument name in the filename matches the "name" attribute of the "instrument" tag in the IDF file.

import mantid2mcvine as m2m

Create a model:

im = m2m.InstrumentModel(
    instrument_name, beamline, mantid_idf, mcvine_idf, template_nxs,
    detsys_shape, tube_info,
    nbanks = nbanks,
    ntubesperpack = ntubesperpack,
    npixelspertube = npixelspertube,
    nmonitors = nmonitors,
    tofbinsize = tofbinsize,
    )

Convert model. this will

1. add mantid IDF to ~/.mantid
2. create mcvine xml
3. create template nxs used for sim.nxs generation

im.convert()

Convert simulated neutrons to simulated nxs file:

events = im.neutrons2events('scattered-neutrons', nodes=20)
simnxs = im.events2nxs(events, 'sim.nxs')

For more details, see demo