[Radiance-general] gloss specifications to roughness/specularity

[Jack de Valpine]

Hi All,

I am curious if there is a way to estimate material 
roughness/specularity based on gloss specifications. PPG provides a 
gloss range for its factory applied metal coatings (such as DURANAR). 
The way they indicate this is as a range at a given measurement angle, 
for example:

    25% to 35%  at 60 degrees

This is according to the ASTM-D523 - Specular Gloss.

Is there some way to make this meaningful as a part of a radiance 
material specification?

Thanks,

-Jack

-- 
# Jack de Valpine
# president
#
# visarc incorporated
# http://www.visarc.com
#
# channeling technology for superior design and construction

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