[Radiance-general] Interpolate BSDFs

[CHI-German Molina]

Wow, that is exactly what I was looking for. I will modify bsdf2rad in
order to get the Hemispherical transmittance (or reflectance) as the stdout.

So I should do, for every pixel´s incident Theta and Phi I want, the
following:

*bsdf2rad  -t  TT_bsdf.xml in_Theta in_Phi 2>
hemispherical_transmission.txt*

Thanks, Greg, as usual.

Germán



2014-02-17 18:55 GMT-03:00 Greg Ward <gregoryjward at gmail.com>:

> Hi Germán,
>
> You can compute the total hemispherical transmittance for a particular
> incident angle using the bsdf library, which is also reported to the
> standard error by bsdf2rad when you run it.
>
> Best,
> -Greg
>
> *From: *CHI-German Molina <gmolina at hdlao.com>
>
> *Date: *February 17, 2014 12:38:49 PM GMT+01:00
>
>
>  Hello Greg, and thanks for your answer.
>
>  I did not know of the existence of bsdf2rad, I will try it soon... also,
> I think I will forget about interpolating, haha.
>
> Is it possible to integrate the outgoing radiation with TT???  My idea is
> to just plot DIRECTIONAL transmittance, so people can choose one or another
> shading device for their designs. I want to explore the posibility of
> overlaying these plots with a solar plot of a certain location, and choose
> a device that blocks the Solar Heat Gains when needed.
>
> THANKS A LOT
>
>
> 2014-02-14 14:50 GMT-03:00 Greg Ward <gregoryjward at gmail.com>:
>
>> Hi Germán,
>>
>> Why not use a tensor tree output of genBSDF in this case?  High
>> resolution on incoming and outgoing angles where it matters is why it was
>> developed.  You can use the C routines to query the TT directly, or use
>> bsdf2rad to generate a Radiance model for visualization.
>>
>> Cheers,
>> -Greg
>>
>> *From: *CHI-German Molina <gmolina at hdlao.com>
>>
>> *Date: *February 14, 2014 8:17:12 AM PST
>>
>>
>>  Hi Lars, Thanks a lot for the quick answer, but I think my question was
>> not really clear.
>>
>> What I want to achieve is to get the directional transmitance from" any"
>> angle. Interpolating  would allow me getting a continuous (although not
>> really exact) value. This is mainly for visualization purposes, not really
>> for getting exact values. By increasing the number of patches I would have
>> a better resolution, but still I would have "bins" and not a continuous
>> value.
>>
>> I hope is clear. If it is too hard (i.e. there is not any program that
>> does it for me), I can just increase the number of bins, and just smooth
>> the final image.
>>
>> Thanks a lot!
>>
>> Germán
>>
>>
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