Trans material - tspec value

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

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 <[email protected]> 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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Radiance-general mailing list
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http://www.radiance-online.org/mailman/listinfo/radiance-general

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 <[email protected]> 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 <[email protected]> > 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

_______________________________________________
Radiance-general mailing list
[email protected]
http://www.radiance-online.org/mailman/listinfo/radiance-general

_______________________________________________
Radiance-general mailing list
[email protected]
http://www.radiance-online.org/mailman/listinfo/radiance-general