[Radiance-general] translucent panel ( trans material )

[Baker, Kristopher]

________________________________
From: radiance-general-bounces at radiance-online.org
To: radiance-general at radiance-online.org
Sent: Thu Dec 17 05:00:32 2009
Subject: [Radiance-general] translucent panel ( trans material )
Hello Everyone,

I know characteristics of a 4mm thick translucent panel (measured with a spectrophotometer). I try to introduce it in RADIANCE.

Measurements on the exterior side (glossy) give :
Transmittance_diffuse = 75.5% and transmittance_spec = 9.1%
Reflectance_diffuse = 7.7%
Absorptance = 7.8%

Measurements on the interior side (mat) give :
Transmittance_diffuse = 81.6% and transmittance_spec = 8.9%
Reflectance_diffuse = 7.8%
Absorptance = 1.6%

I’m not sure that I introduced it in RADIANCE in a correct way …
(following formulas p325 in Rendering with Radiance)
void trans vitr_dif
0
0
7     0.71 0.77 0.77 0 0.1 0.99 0.0012
With
Cr = 0.074
Cg = 0.08
Cb = 0.08
Rd = 0.265*Cr+0.67*Cg+0.065*Cb = 0.07841
Rs = 0
Sr = 0.1
Td = 75.5
Ts = 0.091

Thank you for your help !

Coralie

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Coralie Cauwerts
Researcher
Université catholique de Louvain
Belgium

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