[Radiance-general] Optics glazing in Radiance

[Germán Molina Larrain]

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.
>
> _______________________________________________
> Radiance-general mailing list
> Radiance-general at radiance-online.org
> http://www.radiance-online.org/mailman/listinfo/radiance-general
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.radiance-online.org/pipermail/radiance-general/attachments/20130131/132579e3/attachment-0001.html>