[Radiance-general] genBSDF error

[Germán Molina Larrain]

That makes sense... actualy, what I am doing in mkSchedule is loading the
V, D and all the Ts matrices, but the simulations is made by choosing DC
(=VTD) for each... this avoids re-multiplying VxTxD again and again. It was
much more efficient.



2013/9/30 Rob Guglielmetti <rob.guglielmetti at gmail.com>

> Yeah, we were gonna go a similar route with OpenStudio, including a simple
> library of "clear BSDFs" to be used with models, but in the end we are
> going to do what I described, doing a two pass daylight coefficient deal,
> once for the VMX with glazing, and once as a three phase pair of VMX/DMX.
> This was all thanks to Andy for plotting my stupid "clear BSDFs".
>
> Which I guess means there is now technically a four phase method. =)
>
> -Rob
>
> On Sep 30, 2013, at 4:21 PM, Greg Ward <gregoryjward at gmail.com> wrote:
>
> You're right, Rob.  I remember I even wrote a script at some point for HMG
> to create clear glazing XML files, since it was faster than running
> genBSDF.  Faster still would be using WINDOW6 to create the appropriate XML
> files.
>
> -Greg
>
> *From: *"Guglielmetti, Robert" <Robert.Guglielmetti at nrel.gov>
>
> *Date: *September 30, 2013 11:28:24 AM PDT
>
> *
> *
>
> One scenario I can think of would be using the 3- or 5-phase method to
> look at a window with clear glazing and a shade, and wanting to select the
> appropriate BSDF based on whether the shade is up or down (at runtime). But
> you’re right Greg, of course; given the difficulty of even a high
> resolution BSDF to represent purely specular transmittance or reflectance,
> the best way to handle these situations is to do simply calculate the view
> matrix with the whole model – including the glazing, modeled as glass or
> trans or whatever  -- and then do another round where you do the VMX to the
> glass and the DMX to the sky, and just have the one BSDF for the CFS. With
> gendaymtx, the generation of the matrices is so fast now it makes more
> sense to just do them both (for this scenario) and then at runtime just
> select the appropriate result. ****
>
> ** **
>
> - Rob****
>
> ** **
>
> *From:* Greg Ward [mailto:gregoryjward at gmail.com <gregoryjward at gmail.com>]
>
> *Sent:* Monday, September 30, 2013 10:29 AM
> *To:* Radiance general discussion
> *Subject:* Re: [Radiance-general] genBSDF error****
>
> ** **
>
> Beyond that, I should point out that it is neither necessary nor
> recommended to create an XML file to describe a pane of clear glass.  Even
> the tensor tree format has difficulty representing perfectly specular
> systems such as this, and in fact all the default algorithms in WINDOW6 and
> Radiance work quite well with a more exact description.  Can you explain
> why you even think you need to do this?
>
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