[Radiance-general] Trans material - tspec value

[Andrew McNeil]

Shri,
Have you checked to confirm that the sun shines onto the window in your
rendering? If not, then you wont see much of difference when diffusing what
is already mostly diffuse.
Andy


On Thu, Aug 7, 2014 at 3:13 PM, Shrikar Bhave <shrikarbhave at gmail.com>
wrote:

> Hello All,
>
> I am trying to compare diffusion properties of a glazing assembly by
> rendering an exact same scene but changing only the 'tspec' value from 0
> (ideal diffuser) to 0.9 (almost clear). I have a room with clerestory
> windows which consist of 2 layers of translucent panels. Exterior glazing
> is 60% VLT and interior glazing is 30% VLT with about a 30cm of cavity in
> between.
>
> *Simulation 1*
> void trans panelext60
> 0 0 7 0.978494624 0.978494624 0.978494624 0.07 0 0.65934066 0
>
> void trans panelint30
> 0 0 7 0.978494624 0.978494624 0.978494624 0.07 0 0.32967033 0
>
>
> *Simulation 2*
> void trans panelext60
> 0 0 7 0.978494624 0.978494624 0.978494624 0.07 0 0.65934066 0.9
>
> void trans panelint30
> 0 0 7 0.978494624 0.978494624 0.978494624 0.07 0 0.32967033 0.9
>
> rpict command is as follows,
>
> rpict -vtv -vp 0.1 7.3 1.8 -vd 1 0 0 -vu 0 0 1 -vh 130 -vv 90 -x 3000 -y
> 1400 -ab 4 -aa 0.08 -ar 512 -ad 2048 -as 512 -ds .01 -dj .6 -t 60 sunny.oct
> > lookeast_june21_noon.pic
>
> I was expecting a significant difference in renderings for 2 scenes. The
> second simulation should have resulted in more defined bright patches.
> Though that's not the case. Am I missing something obvious here?
> Unfortunately I cannot attach the complete renderings due to confidential
> nature of the project. I have attached screenshots of the area of interest.
>
> Any help is much appreciated,
>
> Thanks,
>
> Shri
>
>
>
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