Applying Appearance Standards to Light Reflection Models
Harold B. Westlund and Gary W. Meyer

This directory contains the data files used to generate figures
4, 5, and 6 which show the correspondence between standard appearance
measurements and BRDF parameter values.  The files are:
ct.dat    ---- Cook-Torrance reflection model parameters (Figure 6)
phong.dat ---- Phong reflection model parameters (Figure 4)
ward.dat  ---- Ward reflection model parameters (Figure 5)

The fields in each file are listed below.
G_20 = 20 degree specular gloss
G_60 = 60 degree specular gloss
G_85 = 85 degree specular gloss
H_2  =  2 degree haze
H_5  =  5 degree haze

ct.dat
<roughness> <G_20> <G_60> <G_85> <H_2> <H_5>

phong.dat
<log_2(specular exponent)> <specular exponent> <G_20> <G_60> <G_85> <H_2> <H_5>
  note: The Phong model was computed using the specular coefficient modification
        as described by Lewis [27].

ward.dat
<roughness> <G_20> <G_60> <G_85> <H_2> <H_5>