<div>Hi Rob:</div>
<div> </div>
<div>I saw it was developed in 1994 from manual page. My version should contain that. Thanks,</div>
<div> </div>
<div>Jia<br><br></div>
<div class="gmail_quote">On Fri, Mar 26, 2010 at 12:46 AM, Rob Guglielmetti <span dir="ltr"><<a href="mailto:rpg@rumblestrip.org">rpg@rumblestrip.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Hi Jia,<br>
<div class="im"><br>On Mar 25, 2010, at 7:20 PM, Jia Hu wrote:<br>> I have some questions relating to gensky command.<br>><br>> (1) The book of "Rendering with radiance" says luminous efficacy is set to 179 for all CIE sky models. Is that true for current version?<br>
<br></div>The 179 lm/watt is the standard luminous efficacy conversion for Radiance, and yes it's still the same for the current version.<br>
<div class="im"><br>> (2) If I know Solar direct radiation and diffuse radiation, I hope to use Perez's (source: Modeling daylight availability and irradiance components from direct and global irradiance, 1990 solar energy) models (that is, interpolate two CIE sky model according to radiation), is that possible to generate a new sky luminance distribution model by interpolation of two standard CIE model in Radiance in order to calculate the interior illuminance more accurately?<br>
<br></div>If you know direct and diffuse radiation, you can use gendaylit (recently added to the default Radiance distro) to generate a Perez sky model directly. Check the manpage for gendaylit. I have been using it lately for some studies based on TMY weather file info and it works well!<br>
<br>- Rob<br>_______________________________________________<br>Radiance-general mailing list<br><a href="mailto:Radiance-general@radiance-online.org">Radiance-general@radiance-online.org</a><br><a href="http://www.radiance-online.org/mailman/listinfo/radiance-general" target="_blank">http://www.radiance-online.org/mailman/listinfo/radiance-general</a><br>
</blockquote></div><br>