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td - set the diffuse transmittance for the current material
Set the diffuse transmittance for the current material to
using the current color to determine the spectral characteristics.
This is the fraction of visible light that is transmitted through a
surface equally in all (transmitted) directions.
Like reflectance, transmittance is measured according to the
standard v(lambda) curve, and assumes an equal-energy white light source.
It is probably not possible to create a material with a diffuse
transmittance above 50%, since well-diffused light will be reflected
The default diffuse transmittance is zero.
# Model a perfect spherical diffuser, i.e. light hitting \
either side will be scattered equally in all directions
m wonderland_diffuser =