[Radiance-general] Trees

[Tim Perry]

Dear Greg,

Does the surface roughness matter if the reflected specularity (Rs) is zero? 

Thanks,
Tim

PS: Is there a Radiance beginners list? I surely belong there.
PPS: Here is my full definition. I'm using pages 325-326 in Rendering With Radiance as my guide.

Diffuse reflectance (Rd = 40%)
Red: 25%Cr
Green: 70%Cg
Blue: 25%Cb

Reflected Specularity (Rs): 0

Surface Roughness (Sr): 0.0

Diffuse Transmissivity (Td) = 19%

Transmitted Specularity (Ts) = 1%

** Final Material **
void trans TransTreeMat
0
0
7 0.375 1.05 0.375 0 0 0.33333 0.05


________________________________
From: Greg Ward <gregoryjward at gmail.com>
To: Tim Perry <perry2of5 at yahoo.com>; Radiance general discussion <radiance-general at radiance-online.org> 
Sent: Monday, December 5, 2011 5:48 PM
Subject: Re: [Radiance-general] Trees


Hi Tim,

You can do it with trans, and it will work with the 3-phase method.  Here are some useful posts:

[Radiance-general] trans mat

[Radiance-general] trans dashboard widget

Hope this is enough to get you started!

-Greg

From: Tim Perry <perry2of5 at yahoo.com>
>Date: December 5, 2011 5:34:27 PM PST

>
>I would like to model trees outside buildings in my Radiance runs. I would like to model them transmitting about 20% of light and make the canopy 40% reflective.
>    * Can I do this by using a translucent material? 
>    * If so, can you point me to a tutorial?
>    * Will this be compatible with the 3-phase method of daylighting analysis? (I.e., daylight coefficient method with the 3-phase method and a BSDF for the window).
>
>Thanks for any help,
>Tim