[Radiance-general] slightly higher irradiance values for -b 1 option

[Ali Fatoorechi]

Yes the posted figures are sort of avg of multiple runs.

I noticed for -b 10, 100,... options the -ad has to be increased to some x4
more to get same accuracy as -b 1.
But I am not sure if this is expected in Radiance.

Regards,

Ali Fatoorechi
MBS Survey Software Ltd

*62 High Street*


*SteyningWest SussexBN44 3RD*

*T +44 (0)1903 879323M +44(0)7830751409 <+44%207830%20751409>*
ali at surveymbs.com
www.surveymbs.com

On Fri, Apr 21, 2017 at 2:38 PM, Christopher Rush <Christopher.Rush at arup.com
> wrote:

> Ali,
>
> If you run the same commands multiple times, do you always get similar
> results? Does -b 1 always give proportionally 2% higher value than the
> higher orders of magnitude if you repeat the process multiple times, or
> does it vary?
>
>
>
> If you change the –ad or –lw parameters do you get any different degree of
> consistency?
>
>
>
> -Chris
>
>
>
> *From:* Ali Fatoorechi [mailto:ali at surveymbs.com]
> *Sent:* Friday, April 21, 2017 7:57 AM
> *To:* Radiance general discussion
> *Subject:* [Radiance-general] slightly higher irradiance values for -b 1
> option
>
>
>
> Hello guys,
>
>
>
> I am a bit struggling to make sense of numbers I get. I might have done
> something wrong.
>
> The rtrace gives roughly same irradiance figures(apart from the exponent
> component) for overcast sky generated with -b 10, -b 100, -b 1000,
>
> or any other power of 10, while -b 1 gives slightly higher value.
>
>
>
> rtrace -w -h -I -ab 12 -ad 10000 0 -as 4096 -aa 0 -ar 0 -lw 1E-05 room.oct
> < pnt.txt
>
>
>
> !gensky 3 21 10 -c -a 51 -o 0 -m 0 -b 1
>
>
>
> -b 1:       9.245390e-002   9.245390e-002   9.245390e-002
>
> -b 10:     9.045287e-001   9.045287e-001   9.045287e-001
>
> -b 100:   9.023538e+000   9.023538e+000   9.023538e+000
>
> -b 1000: 9.039278e+001   9.039278e+001   9.039278e+001
>
>
>
> This is a simple room with an opening and no glazing.
>
>
>
> Thanks,
>
> Ali
>
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