[Radiance-general] Daylight factor

[Victor Li]

I have increased the -ar to 300, but the results are all the same.

2009/12/13 Victor Li <victorpermanent at gmail.com>

> Thank you very much!
>
> Actually i uesed ECOTET exported to DESKTOP RADIANCE to calculate. The only
> differernce between Daylight factor and Illuminance calculation is the -B
> 0.558659 definition in 11_SKY.RAD
> In Daylight factor calculation the sky is defined as following:
>
> !gensky 12 21 12.00 -c -a 31.400 -o -121.400 -m -120.000 -B 0.558659 |
> xform -rz -27.000
>
> skyfunc glow sky_mat
> 0
> 0
> 4
>      1 1 1 0
>
> sky_mat source sky
> 0
> 0
> 4
>      0 0 1 180
>
> skyfunc glow ground_glow
> 0
> 0
> 4
>      1 .8 .5 0
>
> ground_glow source ground
> 0
> 0
> 4
>      0 0 -1 180
>
> In Illuminance calculation, the definition is :
>
> !gensky 12 21 12.00 -c -a 31.400 -o -121.400 -m -120.000 -B 0.558659 |
> xform -rz -27.000
>
> The rest is all the same.
>
> For converting the output, the ECOTECT can convert it automatically.
>
>
> 2009/12/11 Christopher Rush <Christopher.Rush at arup.com>
>
>  What are the dimensions and resolution of your grid in 11.pts compared to
>> the full boundary of your scene (including ground plane and anything else)
>> in 11.oct? Maybe –ar is not high enough.
>>
>>
>>
>> What is your sky definition going into 11.oct?
>>
>>
>>
>> Do you have an rcalc command to convert the output in 11.dat?
>>
>>
>>
>>
>>
>>
>>
>> *From:* radiance-general-bounces at radiance-online.org [mailto:
>> radiance-general-bounces at radiance-online.org] *On Behalf Of *Victor Li
>> *Sent:* Thursday, December 10, 2009 8:34 PM
>> *To:* Radiance general discussion
>> *Subject:* Re: [Radiance-general] Daylight factor
>>
>>
>>
>> The rtrace setting is "rtrace -I -h -dp 2048 -ar 32 -ms 0.063 -ds .2 -dt
>> .05 -dc .75 -dr 3 -sj 1 -st .01 -ab 8 -aa .1 -ad 512 -as 256 -av 0.01 0.01
>> 0.01 -lr 12 -lw .0005  -af 11.amb 11.oct < 11.pts > 11.dat"  And the two
>> calculations of daylight factor and illuminance are all the same settings.
>> What do you think?
>>
>> 2009/12/10 Christopher Rush <Christopher.Rush at arup.com>
>>
>> It would help to know your command process for calculating illuminance and
>> daylight factor to troubleshoot.
>>
>>
>>
>> Also, if your rpict/rtrace ambient sampling settings are not stringent
>> enough, differences could be due to random sampling variation between two
>> different calculation runs.
>>
>>
>>
>> *From:* radiance-general-bounces at radiance-online.org [mailto:
>> radiance-general-bounces at radiance-online.org] *On Behalf Of *Victor Li
>> *Sent:* Thursday, December 10, 2009 4:04 AM
>> *To:* Radiance general discussion
>> *Subject:* [Radiance-general] Daylight factor
>>
>>
>>
>> Dear:
>>
>> Daylight factors are expressed as the percentage of natural light falling
>> on a work surface compared to that which would have fallen on a completely
>> unobstructed horizontal surface under exactly the same sky conditions. Thus,
>> a daylight factor of 5% on an internal surface means that it received only
>> 1/20th of the maximum available natural light.
>>
>> so we can calculate daylight factor by RADIANCE with a overcast sky. Then
>> i calculated the illuminance under overcast sky. I found the distribution of
>> illuminance and skyfactor in the room is different. For example, in the room
>> ratio of minimum to average of daylight and illuminance are quite different.
>> Would you tell me the reason?
>>
>> Best Regards!
>>
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>
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