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2001-05-21
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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>