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def add_ncrystal_union_material(instrument, name, cfgstr, split=False):
try:
import NCrystal.mcstasutils as NCms
except ImportError or ModuleNotFoundError:
raise RuntimeError("Install NCrystal to use this feature in McStasScript.")
abs_info, ncrystal_processes = NCms.cfgstr_2_unioncfg(cfgstr=cfgstr, split_by_physics=split)
process_names = []
for process in ncrystal_processes:
process_name = name + "_" + process[1]
process_names.append(process_name)
comp = instrument.add_component(process_name, "NCrystal_process")
comp.cfg = '"' + process[0] + '"'
comp = instrument.add_component(name, "Union_make_material")
comp.my_absorption = abs_info
comp.process_string = '"' + ",".join(process_names) + '"'
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