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<b>From</b>: radiance-general-bounces@radiance-online.org <radiance-general-bounces@radiance-online.org>
<br><b>To</b>: radiance-general@radiance-online.org <radiance-general@radiance-online.org>
<br><b>Sent</b>: Thu Dec 17 05:00:32 2009<br><b>Subject</b>: [Radiance-general] translucent panel ( trans material )
<br></font></p>
<div class=Section1>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'>Hello
Everyone, <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'>I
know characteristics of a 4mm thick translucent panel (measured with a
spectrophotometer). I try to introduce it in RADIANCE.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'>Measurements
on the exterior side (glossy) give : <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'>Transmittance_diffuse
= 75.5% and transmittance_spec = 9.1%<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'>Reflectance_diffuse
= 7.7%<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'>Absorptance
= 7.8%<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'>Measurements
on the interior side (mat) give : <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'>Transmittance_diffuse
= 81.6% and transmittance_spec = 8.9%<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'>Reflectance_diffuse
= 7.8%<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'>Absorptance
= 1.6%<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'>I’m
not sure that I introduced it in RADIANCE in a correct way …<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'>(following
formulas p325 in Rendering with Radiance)<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-family:"Arial Narrow","sans-serif"'>void
trans vitr_dif<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-family:"Arial Narrow","sans-serif"'>0<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-family:"Arial Narrow","sans-serif"'>0<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial Narrow","sans-serif"'>7
0.71 0.77 0.77 0 0.1 0.99 0.0012<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Arial Narrow","sans-serif"'>With<span
style='color:#1F497D'> </span><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'>Cr
= 0.074<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'>Cg
= 0.08<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'>Cb
= 0.08<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'>Rd
= 0.265*Cr+0.67*Cg+0.065*Cb = 0.07841<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'>Rs
= 0<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'>Sr
= 0.1<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'>Td
= 75.5<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'>Ts
= 0.091<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'>Thank
you for your help !<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'>Coralie<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial Narrow","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><b><span style='font-size:7.5pt;font-family:"Arial Narrow","sans-serif"'>-----------------------------------------------------------------------------------------<br>
</span></b><span style='font-family:"Arial Narrow","sans-serif"'>Coralie
Cauwerts<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial Narrow","sans-serif"'>Researcher<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial Narrow","sans-serif"'>Université
catholique de Louvain<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial Narrow","sans-serif"'>Belgium<o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
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