<span style="color: rgb(0, 0, 0);">The </span><span style="font-size: 10pt; color: rgb(0, 0, 0);">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?<br>
<br><div class="gmail_quote">2009/12/10 Christopher Rush <span dir="ltr"><<a href="mailto:Christopher.Rush@arup.com">Christopher.Rush@arup.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;">
<div link="blue" vlink="purple" lang="EN-US">
<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: 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 4:04 AM<br>
<b>To:</b> Radiance general discussion<br>
<b>Subject:</b> [Radiance-general] Daylight factor</span></p>
</div><div><div></div><div class="h5">
<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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