Low simulated illuminance levels underdirect sun

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



-----Original Message-----
From: Greg Ward [mailto:gregoryjward@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.


From: Krystyna Zelenay <kzelenay@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,


On Mon, Feb 14, 2011 at 7:09 PM, J. Alstan Jakubiec <alstan@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.


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