mkillum w/ frit

radiance-general
1

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
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
            0.249 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

···

--
Zack Rogers
Engineer / Daylighting Designer
Architectural Energy Corporation
2540 Frontier Avenue, Suite 201
Boulder, CO 80301 USA

tel (303)444-4149 ext.235
fax (303)444-4304

2

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 <[email protected]>
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
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
           0.249 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