[Radiance-general] Interpolate BSDFs

Mon Feb 17 03:38:49 PST 2014

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
>
>
> 2014-02-14 12:01 GMT-03:00 Lars O. Grobe <grobe at gmx.net>:
>
>> Hi German,
>>
>> there will be no light loss. However interpolation does not increase
>> resolution. Think of it as if you were taking a picture with a smartphone
>> from the 90's - the overall average luminance may be correct, but you will
>> never be able to add information on detail in between the pixels by
>> interpolation. So if you want / need high resolution, run genBSDF
>> accordingly.
>>
>> Cheers, Lars.
>>
>> > By the way, my idea would be to:
>> >
>> > 1.- genBSDF the BSDF of a product (klems basis, maybe Klems MF:N)
>> > 2.- from that matrix, interpolate and generate plots.
>> >
>> > I will also have to deal with the loss of energy due to sharp light
>> sources...? That is something that I do not understand yet.
>> >
>> > THANKS AGAIN, any comments welcome.
>> >
>>
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