[Radiance-general] gensky result different from that in, Axel's tutorial

[Ji Zhang]

Thank you very much indeed, Axel and Greg!


On Thu, Jun 24, 2010 at 12:36 AM, Greg Ward <gregoryjward at gmail.com> wrote:

> Just a side-note:  the turbidity factor is _only_ used by gensky to
> estimate the zenith luminance.  If the horizontal irradiance or zenith
> radiance is given using -B or -b (respectively), turbidity is ignored.
>
> Cheers,
> -Greg
>
>  From: Axel Jacobs <jacobs.axel at gmail.com>
>> Date: June 23, 2010 8:27:12 AM PDT
>>
>>
>> Hi Ji Zhang
>>
>> > So, Which output is the correct one? What might causes the
>> > differences?
>>
>> The Radiance Tutorial must be about ten years old now. I keep updating it,
>> fixing small typos and inconsistencies, but have not felt the need to
>> reflect the recent changes to gensky's turbidity.
>>
>> Both, CIE clear and overcast are extremes that are fairly unlikely to
>> occur in reality. As Greg said, you really need to feed in measurements, and
>> also have a good guess at the turbidity if you are concerned about accuracy.
>> If you can supply diffuse and direct irradiation, you might want to use
>> gendaylit instead.
>>
>> Axel
>>
>
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-- 
ZHANG Ji 张冀 (PhD) :: Research Fellow :: Centre for Sustainable Asian Cities
:: School of Design and Environment :: National University of Singapore :: 4
Architecture Drive,  Singapore, 117566 :: Contact: 65-6516 5046 :: Email:
sdezj at nus.edu.sg
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