[Radiance-general] trans

[Martin Moeck]

Radiance 3.5 official LBNL release March 21 2003
 
Scene = a box 3X3X3 m with a south facing window. 
 
Trans = 
0.31   0.31   0.31     0.01     0.02     0.3443     0.191
 
points.inp:
1.5 -.5 1.5       0 -1 0
1.5 0.1 1.5       0 -1 0
 
I assume the following formulae:
 
ts = direct transmittance = 0.02
td = diffuse transmittance = 0.85
rs_a = ts_a = roughness = 0.02
rs = specularity
 
A1 = A2 = A3 = rd / ( (1-rs)*(1-A6) )
A4 = rs = 0.01
A5 = (rs * rs_a _ ts * ts_a) / (rs + ts)
A6 = (td + ts) / (rd + td  + ts)
A7 = ts / (td + ts)
 
Is that correct? 
 
Martin

________________________________

From: radiance-general-bounces at radiance-online.org on behalf of Greg Ward
Sent: Mon 1/2/2006 2:42 PM
To: Radiance general discussion
Subject: Re: [Radiance-general] trans



Hi Martin,

You still aren't giving enough hints as to your problem.  What is 
your scene?  Which version of Radiance are you using?

I just ran a few sanity checks with the rtrace -I option and the 
latest HEAD release on a trans material, and all seems well.

-Greg

> From: "Martin Moeck" <MMoeck at engr.psu.edu>
> Date: January 2, 2006 11:17:34 AM PST
>
> Example:
> rtrace -h -w -I -ab 2 -dr 2 -ds 2 octree < points.inp | rcalc ...
>
> points.inp contains the location and direction of a sensor in front 
> of and then behind the trans material for the calculation of total 
> transmittance.
>
> Martin
>

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