materials.py


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class Material(object):
    def __init__(self, name='none'):
        self.name = name

        self.wavelengths = None
        self.refractive_index = None
        self.absorption_length = None
        self.scattering_length = None

air = Material('air')
h2o = Material('h2o')
glass = Material('glass')
vacuum = Material('vacuum')