[Radiance-general] Low simulated illuminance levels underdirect sun

[Reinhart, Christoph]

Dear Krystyna,

We can probably add a command line option for gensky to DIVA in the
future but using gendaylit indeed seems to be the better solution for
you.

Christoph

-----Original Message-----
From: Greg Ward [mailto:gregoryjward at gmail.com] 
Sent: Tuesday, February 15, 2011 12:05 PM
To: Radiance general discussion
Subject: Re: [Radiance-general] Low simulated illuminance levels
underdirect sun

Hi Krystyna,

I haven't had a chance to play around with DIVA myself, but it sounds
like an amazing tool!  I'm sure the authors will add in some workarounds
in future releases for users who need a little more control over their
simulations, but in the meanwhile, the gendaylit option Alstan mentions
seems like a good one.  Let us know how it all turns out.

Best,
-Greg

> From: Krystyna Zelenay <kzelenay at berkeley.edu>
> Date: February 14, 2011 8:02:33 PM PST
> 
> Hi Greg,
> 
> I got a response from the DIVA mailing list - the program does not
> allow the user to input calibration factors (-r -R -b or -B) for the
> gensky command (I chose to use Rhino in combination w/ the plugin
> DIVA-for-Rhino since I do not have access to a Unix machine and
> because of its user-friendly interface). Will see if I can workaround
> this problem as described below.
> 
> Thank you,
> 
> Krystyna
> 
> 
> On Mon, Feb 14, 2011 at 7:09 PM, J. Alstan Jakubiec
<alstan at jakubiec.net> wrote:
> Dear Krystyna,
> 
> DIVA does not pass any calibration factors to gensky from the weather
> file. It is called as in the below example,
> !gensky 09 21 09 +s -a -16 -o 48 -m 45
> 
> You can't put in the calibration factors using -r -R -b or -B as Greg
> suggests via the DIVA GUI. However, by editing the filename_sky.rad in
> your DIVA temp folder and by running the simulation using
> filenameimg.bat you could short-circuit the GUI and add a calibration
> flag to the gensky command. Note that every time you run a
> visualization from the GUI, you'll need to re-edit the sky.rad file if
> you decide to do this.
> 
> The other option, if you have direct and diffuse radiation data, is to
> use the Perez sky distribution via gendaylit. DIVA has a gui frontend
> to this which you can choose by selecting the Perez Sky option under
> sky condition in the metrics dialog.
> 
> Best,
> Alstan

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