Hi Giovanni,
I will give a short answer and then try to follow-up later with a longer explanation. Regarding the diffusing interlayer, as I recall Optics 5 is not really set up to deal with diffusing materials (unless this has changed recently). Regardless, any material definition exported to Radiance format will be in the form of three materials: a glass definition and a front and back side BRTDfunc. Note however that the BRTDfunc (unless this has been changed) is a very simplified material definition that is not set up to account for angular variation. There are a couple of options to convert Radiance output from Optics 5 to something more useful: A) optics2rad or B) glaze. These are both scripts that come with the standard Radiance distribution.
I am not sure what to suggest for how to manage the diffuse component. This can probably be incorporated into a BRTDfunc definition. Regarding the fritting, I agree with your presumption that if you are any reasonable distance from the building then the individual makeup (lines, dots, whatever), will disappear in most cases. It is possible to build up frit glass definitions (based on percent coverage) using the glaze script.
Regards,
-Jack de Valpine
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On 10/28/2010 7:49 AM, Giovanni Betti wrote:
Dear List,
I am currently trying to simulate a laminated build up with diffusive
interlayer. To get accurate results I turned to Optics5 to build the
laminate. I would expect that the right kind of material definition
would be a trans or transdata, but Optics keep on returning glass and 2
BRTDfunc (front face and back face). As per my understanding the
BRTDfunc will only affect the front and back reflectance, and contains
no information about diffusion.
As I am interested in assessing the effects of different levels of
diffusion in the interlayer, I was wondering if any of you could suggest
what would be the most reliable approach.Also I was wondering how people go about simulating fritting; if the
glass is far enough to make the fritting not visible, is it common
practice reducing the transmissivity by the percentage cover of the
fritting or there are more sophisticated (and accurate) approaches?Thanks in advance for the help,
Giovanni
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Giovanni Betti
Environmental Design Analyst_______________________________________________
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