[Radiance-general] Interpolate BSDFs

[David Griffiths]

Greg

I am sure there must be something simple I am missing but do you know why I would get significantly lower hemispherical transmittance figures from bsdf2rad than from BSDFviewer (e.g. for phi 0 theta 0 in bsdf2rad as compared to  incident patch 1 in BSDFviewer)?

Kind regards

David Griffiths
M +44 (0) 7785 700160
W solaveil.co.uk



On 17 Feb 2014, at 21:55, Greg Ward <gregoryjward at gmail.com> wrote:

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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