Return to index
NAME
td - set the diffuse transmittance for the current material
SYNOPSIS
td
tau_d
DESCRIPTION
Set the diffuse transmittance for the current material to
tau_d
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
as well.
The default diffuse transmittance is zero.
EXAMPLE
# Model a perfect spherical diffuser, i.e. light hitting \
either side will be scattered equally in all directions
m wonderland_diffuser =
c
td .5
rd .5
SEE ALSO
c,
ed,
ir,
m,
rd,
rs,
sides,
ts