Hi Greg,
I have checked for this. The measuring point is placed close to the xaxis,
y=0.15, and when plotting the geometry the rtrace-points are within the area
of the window (see e.g. attached pictures for glass rotation, -rx, of 10, 50
and 80, the red polygon along the x-axis and along the y-axis in x=1.75 is
just for viewing purposes).
Br
Anne
10.eps (8.02 KB)
50.eps (8 KB)
80.eps (7.88 KB)
···
On Sat, May 23, 2009 at 9:01 PM, < [email protected]> wrote:
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1. Transmittance and reflectance dependent on incidence angle
(Anne Iversen)
2. Re: Transmittance and reflectance dependent on incidence
angle (Greg Ward)----------------------------------------------------------------------
Message: 1
Date: Sat, 23 May 2009 14:26:11 +0200
From: Anne Iversen <[email protected]>
Subject: [Radiance-general] Transmittance and reflectance dependent on
incidence angle
To: [email protected]
Message-ID:
<[email protected]>
Content-Type: text/plain; charset="iso-8859-1"Skipped content of type multipart/alternative-------------- next part
-----------------------------------------------------
Rot=10
reflectance:
3.101847e-01 3.101847e-01 3.101847e-01
transmittance:
6.498260e-01 6.498260e-01 6.498260e-01
---------------------------------------
Rot=20
reflectance:
3.108406e-01 3.108406e-01 3.108406e-01
transmittance:
6.492081e-01 6.492081e-01 6.492081e-01
---------------------------------------
Rot=30
reflectance:
3.123640e-01 3.123640e-01 3.123640e-01
transmittance:
6.477730e-01 6.477730e-01 6.477730e-01
---------------------------------------
Rot=40
reflectance:
3.158223e-01 3.158223e-01 3.158223e-01
transmittance:
6.445152e-01 6.445152e-01 6.445152e-01
---------------------------------------
Rot=50
reflectance:
0.000000e+00 0.000000e+00 0.000000e+00
transmittance:
9.608159e-01 9.608159e-01 9.608159e-01
---------------------------------------
Rot=60
reflectance:
0.000000e+00 0.000000e+00 0.000000e+00
transmittance:
9.620314e-01 9.620314e-01 9.620314e-01
---------------------------------------
Rot=70
reflectance:
0.000000e+00 0.000000e+00 0.000000e+00
transmittance:
9.652938e-01 9.652938e-01 9.652938e-01
---------------------------------------
Rot=80
reflectance:
0.000000e+00 0.000000e+00 0.000000e+00
transmittance:
9.743687e-01 9.743687e-01 9.743687e-01
---------------------------------------
Rot=80
reflectance:
0.000000e+00 0.000000e+00 0.000000e+00
transmittance:
9.893354e-01 9.893354e-01 9.893354e-01------------------------------
Message: 2
Date: Sat, 23 May 2009 11:43:42 -0700
From: Greg Ward <[email protected]>
Subject: Re: [Radiance-general] Transmittance and reflectance
dependent on incidence angle
To: Radiance general discussion <[email protected]>
Message-ID: <[email protected]>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowedDumb question, but are you sure your rays are passing through the
window at all angles? Is it possible that when the angle is greater
than 45, the test ray misses the sample?-Greg
> From: Anne Iversen <[email protected]>
> Date: May 23, 2009 5:26:11 AM PDT
>
> Thanks for your reply Chris, I have tried to alter my specular
> treshold (-st) to 0.05, 0.01 or even 0.
> However I still get that with an incidence angle higher than 45
> degress no reflectance occur, and my transmittance increases! This
> was not what I would have expected. I would have expected an
> increase in reflectance and a decrease in transmittance with higher
> incidence angle.
> My question is therefore, am I using a wrong approach to test the
> incidence angle-dependency on transmittance and reflectance of my
> "sample"?
>
>
> My approach has been to vary the rotation of the sample from 'seq
> 10 10 80' plus 87 around the x-axis, and do the rtrace from "above"
> to achieve the reflectance and from "below" to achieve the
> transmittance:
> xform -rx $ROT -t 0 0 0 LamellaGlowTRANS.rad > lamellaGlow.rad
> oconv Materials.mat Glow.sky lamellaGlow.rad > glow.oct
>
> echo "reflectance:"
> echo '1.75 0.1 4 0 0 -1' | rtrace -h -w -dt 0.05 -st 0.01 glow.oct
> echo "transmittance:"
> echo '1.75 0.1 -4 0 0 1' | rtrace -h -w -dt 0.05 -st 0.01 glow.oct
> ...------------------------------
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Anne Iversen
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2000 Frederiksberg
mobil: 20646857