[Radiance-general] lightshelf simulation

[Jack de Valpine]

I think that it is important to understand that one really has to 
consider more than just ambient bounces (-ab). Certainly this is 
important, but ambient resolution (-ar) can have a significant impact on 
results followed by the other ambient related parameters (-ad, -as, -av).

I note that in an earlier post of yours regarding "reflector size" you 
show parameters with -ar 32. Although I have no idea of the size of your 
space, this seems low to me.

I think if you are doing a design comparison and looking at performance, 
you need change as few variables as possible between design scenarios. 
Ideally, in this case, the only "variable" that should change between 
simulation runs is light shelf or no light shelf. That way your 
comparison is not undermined by questions of other varying parameter 
settings.

-Jack

-- 
Jack de Valpine
President

Visarc Incorporated
www.visarc.com

channeling technology for superior design and construction

On 11/19/2012 9:16 AM, Christopher Rush wrote:
>
> It could depend on your measurement point and the rest of the model. 
> Does raising to a higher ab value for both models increase calculation 
> time too much? Maybe you could increase to 5 or more bounces for both 
> models and relax other parameters but maintain reliable results. If 
> you repeat the simulation multiple times or increase calculation 
> parameters and get results within a reasonable margin of error, then 
> you're probably as accurate as possible for the model inputs.
>
> *From:*shailan zareiy [mailto:sh.zareiy at gmail.com]
> *Sent:* Monday, November 19, 2012 3:00 AM
> *To:* Radiance general discussion
> *Subject:* [Radiance-general] lightshelf simulation
>
> Dear all
>
> I am analyzing light shelf with different dimensions for my thesis. I 
> want to compare a model with light shelf with a model without shelf. I 
> wonder If I should change the ambient bounces parameter in the no 
> shelf model, because the  reflections decreases, or not,? The ab 
> parameter that used for the models with shelf is 3.
>
> Thanks in advance
>
> Sincerely
>
> Shailan Zareiy
>
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