[Radiance-general] genklemsamp - surface orientation

[Germán Molina Larrain]

Hello everyone,

Sorry to bring this topic back to live, but I have one doubt.

I thought the view-up was to tell Radiance the orientation of the BSDF
data... I mean, the "y" direction on the BSDF calculations. Is that ok?

In that case, if I put a skylight, my "view up" would be horizontal, even
if the view up of the scene is not....??? Does it make sense to set the
"view up" as 0 0 1 in the case that Jack is mentioning?

THANKS VERY MUCH

German


2013/3/29 Greg Ward <gregoryjward at gmail.com>

> Hi Jack,
>
> The view defaults for genklemsamp are the same as the rendering programs,
> except that it assumes a parallel view (-vtl).  The view up vector will be
> +Z unless you specify otherwise.  So long as it isn't parallel to your view
> direction, as in the case of a horizontal skylight, you don't need to
> specify it.
>
> You will need to specify the interior normal direction using the kbin()
> function defined in klems_int.cal for your "view matrix" calculation.  Just
> make sure these agree with what you give to genklemsamp.
>
> Cheers,
> -Greg
>
> *From: *Jack de Valpine <jedev at visarc.com>
>
> *Date: *March 29, 2013 2:06:33 PM PDT
>
> *
> *
>
> Hi all,
>
> I am trying to figure sampling window geometry where the normal is not
> parallel to the ground plane. So a sloped skylight for example. If I am
> passing the geometry for the glazing to genklemsamp, is all I need in
> addition, the normal for the surface? For example:
>
> genklemsamp -vd 1 0 1 sloped_window.rad > samples.dat
>
> or do I need to specify view up?
>
> Thanks,
>
> -Jack
>
> --
> Jack de Valpine
> President
>
> Visarc Incorporatedwww.visarc.com
>
> channeling technology for superior design and construction
>
>
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>
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