[Radiance-general] Optics glazing in Radiance

[Germán Molina Larrain]

I forgot about it... heard of if a couple of months ago.

Thanks again Greg!



2013/1/31 Greg Ward <gregoryjward at gmail.com>

> Did you try the optics2rad script I wrote for this purpose?
>
> -Greg
>
> *From: *Germán Molina Larrain <gmolina1 at uc.cl>
>
> *Date: *January 31, 2013 7:01:53 AM PST
>
> *
> *
>
> People,
>
> As Greg said, the HEAD compiled correctly this time... maybe it was just
> the version I tried.
>
> Lars,
>
> What I am trying to do is to actually compare the BSDF given in Klems
> basis by WINDOW, and the one generated in the same basis by genBSDF; based
> on the materials from Optics. Since I am not comparing the lighting levels;
> I understand that the resolution should not be a problem, right?
>
> Now thinking that *"there are not many cases where both the BRTDfunc and
> the glass model as given by Optics make sense, but Optics will not take the
> decision"*, is there any documentation about modeling "modern glazing
> systems"?; for example, I understand that BRTDfunc are oriented to one
> side... How can one deal with the inter-reflections between two glazings?
>
> THANKS VERY MUCH
>
> 2013/1/30 Lars O. Grobe <grobe at gmx.net>
>
>> Hi German,
>>
>> if you model clear glass, (almost) all transmission is direct. This works
>> very efficient for the glass material type, but in theory requires infinite
>> resolution for a BSDF if you want the models to match. I think there are
>> not many cases where both the BRTDfunc and the glass model as given by
>> Optics make sense, but Optics will not take the decision.
>>
>> So for anything that you do not have any scatter defined, I'd use glass
>> (dielectric if not thin and to be approximated as one surface).
>>
>> BRTDfunc output is fine for anything scattering with the limitations of
>> BRTDfunc in the ambient calculation. That is where Window6 comes into play,
>> exporting the BSDF model which is really fully supported by Radiance -
>> though it has a limited resolution.
>>
>> Cheers, Lars.
>>
>> > In the other hand; I am trying to see the difference between the BSDF
>> generated when modeling a glazing using the "glass" primitive given by
>> Optics; and the BRTDfunc given by the same program. For now everything
>> suggest that the second one will need much more rays to converge... am I
>> right?
>> >
>> > I am expecting to see difference in the reflecting part, not in the
>> transmitted part.
>>
>>
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