I have increased the -ar to 300, but the results are all the same. <br><br><div class="gmail_quote">2009/12/13 Victor Li <span dir="ltr"><<a href="mailto:victorpermanent@gmail.com">victorpermanent@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Thank you very much!<br><br>Actually i uesed ECOTET exported to DESKTOP RADIANCE to calculate. The only differernce between Daylight factor and Illuminance calculation is the -B 0.558659 definition in 11_SKY.RAD <br>
In Daylight factor calculation the sky is defined as following:<br>
<br>!gensky 12 21 12.00 -c -a 31.400 -o -121.400 -m -120.000 -B 0.558659 | xform -rz -27.000<br><br>skyfunc glow sky_mat<br>0<br>0<br>4<br> 1 1 1 0<br><br>sky_mat source sky<br>0<br>0<br>4<br> 0 0 1 180<br><br>skyfunc glow ground_glow<br>
0<br>0<br>4<br> 1 .8 .5 0<br><br>ground_glow source ground<br>0<br>0<br>4<br> 0 0 -1 180<br><br>In Illuminance calculation, the definition is :<br><br>!gensky 12 21 12.00 -c -a 31.400 -o -121.400 -m -120.000 -B 0.558659 | xform -rz -27.000<br>
<br>The rest is all the same.<br><br><span style="color: rgb(0, 0, 0);">For </span><span style="font-size: 10pt; color: rgb(0, 0, 0);"> converting the output</span>, the ECOTECT can convert it automatically.<br><br><br><div class="gmail_quote">
2009/12/11 Christopher Rush <span dir="ltr"><<a href="mailto:Christopher.Rush@arup.com" target="_blank">Christopher.Rush@arup.com</a>></span><div><div></div><div class="h5"><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div link="blue" vlink="purple" lang="EN-US">
<div>
<p class="MsoNormal"><span style="font-size: 10pt; color: rgb(31, 73, 125);">What are the dimensions and resolution of your grid in 11.pts
compared to the full boundary of your scene (including ground plane and anything
else) in 11.oct? Maybe –ar is not high enough.</span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: rgb(31, 73, 125);">What is your sky definition going into 11.oct?</span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: rgb(31, 73, 125);">Do you have an rcalc command to convert the output in 11.dat?</span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: rgb(31, 73, 125);"> </span></p>
<div style="border-style: solid none none; border-color: rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><span style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;">
<a href="mailto:radiance-general-bounces@radiance-online.org" target="_blank">radiance-general-bounces@radiance-online.org</a>
[mailto:<a href="mailto:radiance-general-bounces@radiance-online.org" target="_blank">radiance-general-bounces@radiance-online.org</a>] <b>On Behalf Of </b>Victor
Li<br>
<b>Sent:</b> Thursday, December 10, 2009 8:34 PM<br>
<b>To:</b> Radiance general discussion<br>
<b>Subject:</b> Re: [Radiance-general] Daylight factor</span></p>
</div><div><div></div><div>
<p class="MsoNormal"> </p>
<p class="MsoNormal" style="margin-bottom: 12pt;"><span style="color: black;">The </span><span style="font-size: 10pt; color: black;">rtrace setting is "rtrace -I -h -dp
2048 -ar 32 -ms 0.063 -ds .2 -dt .05 -dc .75 -dr 3 -sj 1 -st .01 -ab 8 -aa .1
-ad 512 -as 256 -av 0.01 0.01 0.01 -lr 12 -lw .0005 -af 11.amb 11.oct
< 11.pts > 11.dat</span>" And the two calculations of daylight
factor and illuminance are all the same settings. What do you think?</p>
<div>
<p class="MsoNormal">2009/12/10 Christopher Rush <<a href="mailto:Christopher.Rush@arup.com" target="_blank">Christopher.Rush@arup.com</a>></p>
<div>
<div>
<p class="MsoNormal"><span style="font-size: 10pt; color: rgb(31, 73, 125);">It would help to know your command
process for calculating illuminance and daylight factor to troubleshoot.</span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: rgb(31, 73, 125);">Also, if your rpict/rtrace ambient
sampling settings are not stringent enough, differences could be due to random
sampling variation between two different calculation runs.</span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: rgb(31, 73, 125);"> </span></p>
<div style="border-style: solid none none; border-color: -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><span style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;"> <a href="mailto:radiance-general-bounces@radiance-online.org" target="_blank">radiance-general-bounces@radiance-online.org</a>
[mailto:<a href="mailto:radiance-general-bounces@radiance-online.org" target="_blank">radiance-general-bounces@radiance-online.org</a>] <b>On Behalf
Of </b>Victor Li<br>
<b>Sent:</b> Thursday, December 10, 2009 4:04 AM<br>
<b>To:</b> Radiance general discussion<br>
<b>Subject:</b> [Radiance-general] Daylight factor</span></p>
</div>
<div>
<div>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Dear:<br>
<br>
Daylight factors are expressed as the percentage of natural light falling on a
work surface compared to that which would have fallen on a completely
unobstructed horizontal surface under exactly the same sky conditions. Thus, a
daylight factor of 5% on an internal surface means that it received only 1/20th
of the maximum available natural light.<br>
<br>
so we can calculate daylight factor by RADIANCE with a overcast sky. Then i
calculated the illuminance under overcast sky. I found the distribution of
illuminance and skyfactor in the room is different. For example, in the room
ratio of minimum to average of daylight and illuminance are quite different.
Would you tell me the reason?<br>
<br>
Best Regards!</p>
</div>
</div>
</div>
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