[Radiance-general] Trans Oddities Part Deux

[Jack de Valpine]

Hey Rob,

How are you determining the reflectance of your trans materials, 
(measurement or cut sheet)?

-Jack

Rob Guglielmetti wrote:

> Well, I tried Greg's suggestion of setting the limit weight to a very 
> low number, but all that did is manage to scrounge up a few additional 
> lux.  This actually made things look worse, because my problems are 
> with the really dense shades (which are already coming up with higher 
> numbers than I'd expect).
>
> I have a spreadsheet here with the results of all my tests so far.  If 
> anyone's interested in looking at it I'd be happy to share it.  
> Perhaps there's a problem with my interpretation of this data.  I 
> dunno. But the tests indicate that whenever I try a 1% shade in any 
> combination, I get very odd results from rtrace.  And the whole reason 
> I'm doing this test is because we were getting similar odd results on 
> our real model; I was trying to simplify things so I could perhaps 
> isolate something that was causing these oddities.  So far, no joy.  I 
> shared my trans material definitions for all these tests earlier, but 
> if anyone wants them to have a look I can send those as well.
>
> My fear is that I'm simply trying to find too small a percentage of 
> the available light, and relative comparisons between different shade 
> materials will not be valid for this model. (?)  I mean, this test 
> model still has two pieces of diffuse glass in it, and the skylight is 
> prety small, so already the building form/glazing is removing a ton of 
> light from the space.  Then when I start throwing shades in the 
> skylight cavity, we're getting down to really tiny fractions of the 
> exterior light.  I dunno, I'd love to hear any thoughts.
>
> ----
>
>      Rob Guglielmetti
>
> e. rpg@rumblestrip.org
> w. www.rumblestrip.org
>
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>

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