[Radiance-general] gensky

[Jia Hu]

Hi Rob:

You are right.The lastest version notes it includes the Gendaylit
finally. I can not install Radiance through Makeall because there is an
error indicating that some directory can not be copied (because of existing
file). I followed the instruction at
http://www.radiance-online.org/pipermail/radiance-general/2007-August/004398.html
to install new Radiance version download from
http://radsite.lbl.gov/radiance/framed.html. Is that right?

Thanks,

Jia

On Fri, Mar 26, 2010 at 1:05 AM, Rob Guglielmetti <rpg at rumblestrip.org>wrote:

>  Hi Jia,
>
> gendaylit was only included in the source distribution for the last couple
> months (maybe even less than that, the days are blurring together lately).
> Not sure what you mean by "it" was developed in 1994. Are you using
> pre-compiled binaries, or some kind of rpm distribution? If so, I doubt you
> have gendaylit installed, as this was included in the Radiance source
> distribution only recently. Gendaylit has been around a while, but prior to
> the new Radiance release, you had to go get it and compile it yourself. If
> you are compiling from source, then you could grab the latest official
> release (announced very recently) and compile, and you'd have it.
>
> At any rate, it's worth seeking it out one way or another because you can
> use it for precisely what you're talking about.
>
> - Rob
>
>  On Mar 25, 2010, at 10:56 PM, Jia Hu wrote:
>
>  Hi Rob:
>
> I saw it was developed in 1994 from manual page. My version should contain
> that. Thanks,
>
> Jia
>
> On Fri, Mar 26, 2010 at 12:46 AM, Rob Guglielmetti <rpg at rumblestrip.org>wrote:
>
>> Hi Jia,
>>
>> On Mar 25, 2010, at 7:20 PM, Jia Hu wrote:
>> > I have some questions relating to gensky command.
>> >
>> > (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?
>>
>> The 179 lm/watt is the standard luminous efficacy conversion for Radiance,
>> and yes it's still the same for the current version.
>>
>> > (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?
>>
>> 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!
>>
>> - Rob
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>
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