[Radiance-general] Combining "trans" and "glass"

[Guglielmetti, Robert]

What about it didn't work? Andy McNeil did a nice analysis of the
two-polygon versus "combined" approaches on the Unmet Hours forum
recently, albeit with clear glazing. He showed that trying to combine
materials without doing the proper ray traversals is dubious, basically.
See this thread:

https://unmethours.com/question/1037/converting-transmittance-to-transmissi
vity-for-igus/


I'd think that if it fails with two pieces of specularly transmitting
materials, the results would potentially be even worse with a mix of
transmittance types.


- Rob


On 12/17/14, 9:35 AM, "Randolph Fritz" <randolphf at lumald.com> wrote:

>The last time I tried that, I don't recall it working, though maybe that
>was a different situation.
>
>Randolph M. Fritz
>Luma
>206.596.8625 d
>
>-----Original Message-----
>From: Guglielmetti, Robert [mailto:Robert.Guglielmetti at nrel.gov]
>Sent: Wednesday, December 17, 2014 7:19 AM
>To: Radiance general discussion
>Subject: Re: [Radiance-general] Combining "trans" and "glass"
>
>You're looking to combine these for a Radiance simulation? Why not just
>have two polygons, one for the trans and one for the glass, slightly
>offset from one another?
>
>On 12/17/14, 12:16 AM, "Randolph Fritz"
><randolphf at lumald.com<mailto:randolphf at lumald.com>> wrote:
>
>
>One of our designers proposed a detail where (if I remember correctly) an
>exterior layer of transparent glass is combined with an internal layer of
>Solera translucent material. Is there a simple way to combine the
>transmissivities of the two materials?
>
>
>I am almost thinking it might be better to use a different variant of
>Solera, just to avoid the calculation!
>
>
>Randolph
>
>
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