[Radiance-general] mkillum w/ frit

[Greg Ward]

Hi Zack,

I cannot think of any particular reason why mkillum would not work  
with your frit description, though the output of glaze.csh is likely  
to be more accurate since it accounts for changes in transmission  
w.r.t. incident angle.  A mixed material should not mix up mkillum,  
as it just traces rays through the surface and tallies whatever comes  
out the other side.

-Greg

> From: Zack Rogers <zrogers at archenergy.com>
> Date: July 20, 2005 10:29:18 AM PDT
>
> Hello,
>
> I am wondering about the use of mkillum on a surface that is  
> defined with mixfunc to model a frit pattern on glass.
>
> my definition looks like this:
>
> void plastic grey_065
> 0
> 0
> 5            0.65          0.65          0.65
>                0             0
>
> void BRTDfunc PPG-SB80
> 10 rrho grho brho rtau gtau btau 0 0 0 glazing.cal
> 0
> 18              0             0             0
>                0             0             0
>                0             0             0
>            0.249         0.355         0.329
>            0.363         0.364         0.262
>            0.434          0.49         0.461
>
> void mixfunc l_glass_af+++x+++frit_dot_40%_y
> 6   PPG-SB80 grey_065 y_hole function/perforate.cal
>    -s .03
> 0
> 1           0.356
>
> Can I use the surfaces with this material applied as illum surfaces  
> for mkillum with accurate results?  Searching the online db, I  
> found discussion of this glaze.csh script. Does this create a  
> better model for a fritted glass, and is this used with mkillum?   
> My definition for the glass comes from Optics 5.
>
> Thanks!
> Zack