[Radiance-general] HDR Sky Camera @ LBNL's Flexlab

[CHI-German Molina]

Wow, I have been thinking on doing this for a while... although I have no
idea where to start from.

Is it possible to calculate the Daylight Coefficients of the building; and
use the HDR image to generate sky vectors and calculate different options
for optimizing daylighting?

I am picturing a computer that, every 5 minutes, calculate the sky vector,
computes the interior lighting conditions, and simulates the different
lighting options performing a whole-building lighting control with no photo
sensors. Even more, maybe a whole neighborhood could use the same camera.
Nonsense?

Thanks for sharing!


2014-06-27 0:59 GMT-04:00 Joe Smith <the.oat.cracker at gmail.com>:

> Hi, Andy, thanks for sharing LBNL's sky mapping experiment!
>
> Can you kindly advice on resources that elaborate on how to use HDR sky
> image for daylight simulation? Does it involve specifying the HDR image,
> rather than a "skyfunc", as the material identifier for the sky geometry?
> How is the pixel value of a given point on the HDR image converted to
> luminance value of the corresponding position on the sky?
>
> Thanks!
> - Joe
>
> Andrew McNeil <amcneil at lbl.gov>于2014年6月27日星期五写道：
>
> Hi Everyone,
>>
>> LBNL has installed an HDR sky camera at our new FLEXLAB site:
>> http://flexskycam.lbl.gov. I've uploaded sample data, including hdr
>> images and csv datafiles, recorded by the camera for three days over the
>> past week( clear, partly cloudy and overcast). We're happy to share more
>> data with other researchers and daylight practitioners (but we don't have
>> much to offer yet).
>>
>> The images can be mapped to a Radiance sky for simulation under real sky
>> conditions. I have not used the sky HDR images yet, myself, so if anybody
>> uses them successfully please report back and share what you've done!
>>
>> Questions about the camera hardware and capabilities should be directed
>> to Chris Humann at Terrestrial Light.
>>
>> Best,
>> Andy
>>
>
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-- 
*Germán Molina L.*
Ingeniero Trainee
Hunter Douglas Chile S.A.
Celular +569 89224445

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