[Radiance-general] Trans material - tspec value

[Shrikar Bhave]

You were spot on Andy! Tried a different time and it all makes sense now.

Thanks,

Shri


On Thu, Aug 7, 2014 at 7:18 PM, Andrew McNeil <amcneil at lbl.gov> wrote:

> 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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>>
>
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