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NAME
rs - set the specular reflectance for the current material
SYNOPSIS
rs
rho_s alpha_r
DESCRIPTION
Set the specular reflectance for the current material to
rho_s
using the current color to determine the spectral characteristics.
The surface roughness parameter is set to
alpha_r,
which is the RMS height of surface variations over the
autocorrelation distance (equivalent to RMS facet slope).
A roughness value of zero means a perfectly smooth surface, and
values greater than 0.2 are unusual.
(See application notes section 6.1.2 for a comparison between the
roughness parameter and Phong specular power.)
The default specular reflectance is zero.
EXAMPLE
# Define a slightly rough brass metallic surface
m rough_brass =
c
cxy .3820 .4035
# 30% specular, 9% diffuse
rs .30 .08
rd .09
SEE ALSO
c,
ed,
ir,
m,
rd,
sides,
td,
ts