[Radiance-general] modeling trees in Radiance

[Greg Ward]

Hi Joe,

If you want to model your tree as a sphere (on a stick?) with a certain transmittance, the "trans" material type should suit your purpose.  Parameter setting is a bit tricky, but since you don't have any reflection or scattering to consider, simply set values according to your transmittance T:

void trans treeT
0
0
7 T T T 0 0 1 1

I hope this addresses your question.

Best,
-Greg

> From: Joe Smith <the.oat.cracker at gmail.com>
> Subject: [Radiance-general] modeling trees in Radiance
> Date: February 5, 2015 3:41:24 AM EST
> 
> Dear list, 
> 
> May I ask advices on modeling trees in a Radiance scene? 
> 
> Suppose I can get a so-called "transmittance coefficient" value for a given type of tree through field measurement and then calculating the average ratio of the irradiance below a tree to that above it for multiple points below a tree under various types of sky conditions, what surface parameter can I specify in Radiance for a simplified sphere surface representing a tree that can use this "transmittance coefficient" as a reference for simulation to understand the impact of the tree to the surrounding environment in terms of shading? 
> 
> Hope I explain myself clearly ... 
> 
> Thanks!
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