[Radiance-general] glass reflectance

[Gregory J. Ward]

Hi Nick,

I was waiting for someone else to answer your query, but I guess it's  
not happening.

The best option is probably the new "glaze" script in Radiance 3.6, but  
there's no man page and you'll have to dig into the C-shell source a  
bit to see how to specify your own material properties.

The next option is to do as you suggest and vary the specularity of a  
trans primitive.  The downside to this (other than figuring out what  
the heck to set the parameters to) is it won't account for variations  
in reflectance with incident angle.  For this, you would have to use  
the glaze script if you have something other than a piece of clear or  
absorbing glass.

-Greg

P.S.  If you are stuck with Desktop Radiance, you're out of luck with  
regards to glaze.  But, you could use Francesco Anselmo's Cygwin  
version:

http://www.dream.unipa.it/dream/pub/dot/anselmo/radiance/cygwin/ 
radiance_cygwin_3R6P1.tar.gz

> From: Nicholas Lander <njlander at yahoo.com.au>
> Date: January 23, 2005 4:52:32 PM PST
>
> Hi,
>
> I'm working on a project with glazing options that
> have different internal reflectances.  What's the best
> way to model this?  I'm thinking trans with 100%
> specular transmission and changing the specular
> reflectance.
>
> Any ideas?
> (I'm cross-posting this on Radiance and DR sites.)
>
> Cheers
>
> Nick L