Dear DIVA community,

Quick question: Can DAYSIM read a BRTDF generated by Jack de Valpine's glaze routine?

I'm using glaze in BASH to generate BRTDF of window assemblies with frit patterns and I'm wondering if I can run a climate-based analysis using DAYSIM.

The only remarks that I've found are from 2008. At the time Christoph Reinhart stated that he did not use the BRTDF function with Daysim. It seems there was a color issue (Daysim would not reset the color of the glazing to gray). See discussion here.

Kind regards,

Luis Santos

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Dear Luis,

Like Christoph, I have not used the glaze output in Daysim. I can test it if you have a material prepared.

Best,

Alstan

Hi Alstan,

Thanks a lot.

Please find in attach a *.rad file with a couple of BRDT based materials, directly produced by glaze.

Best,

Luis

Attachments:

Hi Luis,

As far as I can tell, it works! The BRTDfunc's seem to be converted using radfiles2daysim, and the simulation shows no errors. That said, the colorimetric information is not converted to greyscale, so there will be a shift in the reflected and transmitted light unless you calculate the total transmission / reflection yourself and manually edit the BRTD materials to be greyscale.

Original Material

void BRTDfunc Viracon_100_PercFrit
10
if(Rdot,cr(1*rclr,0*1*tclr,fr(0.038)),cr(fr(0.058),ft(0.7),0*rclr))
if(Rdot,cr(1*rclr,0*1*tclr,fr(0.038)),cr(fr(0.068),ft(0.744),0*rclr))
if(Rdot,cr(1*rclr,0*1*tclr,fr(0.046)),cr(fr(0.076),ft(0.668),0*rclr))
0*1*ft(0.7)*tclr
0*1*ft(0.744)*tclr
0*1*ft(0.668)*tclr
        0 0 0
        glaze2.cal
0
9
0.249
0.244
0.242
0.2891
0.32658624
0.26327216
0.147
0.15624
0.14028

radfiles2daysim Converted Material

void BRTDfunc Viracon_100_PercFrit
 10  if(Rdot,cr(1*rclr,0*1*tclr,fr(0.038)),cr(fr(0.058),ft(0.7),0*rclr))  if(Rdot,cr(1*rclr,0*1*tclr,fr(0.038)),cr(fr(0.068),ft(0.744),0*rclr))  if(Rdot,cr(1*rclr,0*1*tclr,fr(0.046)),cr(fr(0.076),ft(0.668),0*rclr))  0*1*ft(0.7)*tclr  0*1*ft(0.744)*tclr  0*1*ft(0.668)*tclr  0  0  0  glaze2.cal
0
9 0.249 0.244 0.242 0.2891 0.32658624 0.26327216 0.147 0.15624 0.14028

Best,

Alstan

Thanks a lot Alstan,

Any idea how can I  manually edit the BRTD material to be greyscale and still have the same visual transmittance / reflectance?

I guess that perhaps the easiest way would be feeding a grey scale material to glaze (i.e., tweaking the output from Optics which is the input for Glaze).

Best,

Luis

> I guess that perhaps the easiest way would be feeding a grey scale material to glaze (i.e., tweaking the output from Optics which is the input for Glaze).

Yes -- that would actually be ideal! 

Alstan

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