[Radiance-general] trans material

[Reinhart, Christoph]

Hi Friedemann,
 
The trans material is indeed a bit confusing (no offense Greg:)). We did
a validation last year for a translucent material along with some
measurements of a real material. Maybe you'll find the paper useful:
Reinhart C F, Andersen M, "Development and validation of a Radiance
model for a translucent panel", Energy and Buildings 38:7 pp. 890-904,
2006.
http://irc.nrc-cnrc.gc.ca/pubs/fulltext/nrcc48165/nrcc48165.pdf
 
Also, you might want to have a look at
http://www.schorsch.com/rayfront/manual/transdef.html to bette undrstand
the trans material.
 
Christoph
________________________________

From: radiance-general-bounces at radiance-online.org
[mailto:radiance-general-bounces at radiance-online.org] On Behalf Of
Friedemann Kik
Sent: Friday, January 26, 2007 6:39 AM
To: Radiance general discussion
Subject: [Radiance-general] trans material


Hi all,
I should simulate a screen material with highly specular reflection
(0.8) at one side like aluminized matrial  an a totally diffuse
transmission of  about 0.1.
The parameter of spec for trans material isn't described very well in
'Rendering with Radiance' so I couldn't understand it. Does a numer of 1
spec means a totally specularity for diffuse and direct light ? If so
should I use somthing like this:
 
screen trans spec-diff_80-10
0 0 7 1 1 1 .8 0 .1 0
 
correct? Or does anybody know a BRTDfunc material definition for this
issue?
 
Thanks for help!
 
Friedemann Kik
Transsolar Stuttgart
 
 
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