Architectural model board material properties

radiance-general
1

Hi to one and all.

Just a quick query that I am hoping some of the more enlightened may shed
some light one....I am modelling a simple room that I constructed from
standard black mounting board (card board, black one side, white the other).
Cannon-Brookes (Simple scale models for daylighting design...CIBSE national
lighting conference 1996, pp. 147-153) states that such mounting board will
have a reflectance of 8.5%.

If I wish to model this in Radiance, what specularity and roughness might
anyone suggest...or perhaps you know of a reference that such work is
presented? I will set the reflectance for the material by altering the
material RAD file. The actual material I am using currently is
Traffic_black, which has reflectance of 8.83% and zero specularity and
roughness.

Furthermore, the material file which I used in desktop radiance states a
reflectance of 8.83 (Traffic black) but when I looked at the respective RAD
file I get:

# RAL9017_Traffic_black RAL RAL840-HR
# 0.02
void plastic RAL9017_Traffic_black
0
0
5 0.05098 0.070588 0.101961 0 0

I assume these values for 8.83% reflectance were shown to have 5% red, 7%
green, and 10% blue were shown to exist for this material (does anyone have
a reference for this study?). What configuration should I use for mounting
board to produce 8.5% or is there a great difference from the simulation end
point?

With kind regards,

Anthony

···

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Today's Topics:

   1. Fuzzmaker Program (Marcus Jacobs)
   2. Re: Fuzzmaker Program (Greg Ward)

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Message: 1
Date: Wed, 11 Aug 2004 14:38:10 +0000
From: "Marcus Jacobs" <marcdevon@hotmail.com>
Subject: [Radiance-general] Fuzzmaker Program
To: radiance-general@radiance-online.org
Message-ID: <BAY2-F41k2zUa0eao1y00010a12@hotmail.com>
Content-Type: text/plain; format=flowed

Dear Group

I came across a Radiance rendering of an orange and a tennis ball (I think
many people are familiar with this scene). I do understand that the fuzz on
the tennis ball is geometry. I am wondering if there exist a program a
program that created and/or instanced the geometry to create this.

Thanks

Marcus

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------------------------------

Message: 2
Date: Wed, 11 Aug 2004 10:45:00 -0700
From: Greg Ward <gward@lmi.net>
Subject: Re: [Radiance-general] Fuzzmaker Program
To: Radiance general discussion <radiance-general@radiance-online.org>
Message-ID: <2ABF167E-EBBE-11D8-ACFF-00306540F848@lmi.net>
Content-Type: text/plain; charset=US-ASCII; format=flowed

I found the original code, by Isaac Kwo, and mailed it to Marcus. If
anyone else wants it, please ask him directly.

-Greg

From: "Marcus Jacobs" <marcdevon@hotmail.com>
Date: August 11, 2004 7:38:10 AM PDT

Dear Group

I came across a Radiance rendering of an orange and a tennis ball (I
think many people are familiar with this scene). I do understand that
the fuzz on the tennis ball is geometry. I am wondering if there exist
a program a program that created and/or instanced the geometry to
create this.

Thanks

Marcus

------------------------------

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