[Radiance-general] Any method to calculate sky view factor in Radiance?

[Katsuya Obara]

Dear all,

I want to calculate sky view factor.
Trying to find in google, I could not find solid information which I can refer to.
Could anyone tell me what kind of approach I can have to calculate sky view factor?

Thank you.
Katsuya

____________________________________________________________
Electronic mail messages entering and leaving Arup business
systems are scanned for viruses and acceptability of content

[Compagnon Raphaël]

Hello

A simple approach is to compute the illuminance level under a uniform sky.
First define a uniform sky (uni.rad) like this:

void glow sky_glow
0
0
4 0.318309886 0.318309886 0.318309886 0
sky_glow source sky
0
0
4 0 0 1 180

Note that the radiance value 0.318309886=1/PI
This makes the illuminance value computed for an unobstructed horizontal plane equal to 1 and this matches in fact the SVF value!


To compute SVF values for several points, then use rtrace with option -I like this:


oconv uni.rad >uni.oct
cat points | rtrace -h -ab 1 -I uni.oct | rcalc -e 'SVF=$1;$1=SVF;'

where points is a file where calculation points are stored as:
x y z xdir ydir zdir

For instance using these three points you can check that SVF values are well computed as 1 for an horizontal plane and 0.5 for vertical planes:
0 0 0 0 0 1
0 0 0 0 1 0
0 0 0 1 0 0

Of course SVF values are usually more interesting to compute for scenes containing objects... These should be defined in a scene file and then merged in the octree before doint the SVF calculations:


oconv uni.rad myscene.rad >scene.oct
cat points | rtrace -h -ab 1 -I scene.oct | rcalc -e 'SVF=$1;$1=SVF;'


Hope this will help you!
Raphaël







________________________________
De : Katsuya Obara <***@arup.com>
Envoyé : jeudi 12 avril 2018 01:54:46
À : radiance-***@radiance-online.org
Objet : [Radiance-general] Any method to calculate sky view factor in Radiance?

Dear all,

I want to calculate sky view factor.
Trying to find in google, I could not find solid information which I can refer to.
Could anyone tell me what kind of approach I can have to calculate sky view factor?

Thank you.
Katsuya


____________________________________________________________
Electronic mail messages entering and leaving Arup business
systems are scanned for viruses and acceptability of content

[Katsuya Obara]

Dear Raphael,

Thank you very much for your answer.
Since I am not familiar with Unix, may I ask you how I should write in Microsoft batch file for following part?
cat points | rtrace -h -ab 1 -I uni.oct | rcalc -e 'SVF=$1;$1=SVF;'
Especially, I could not figure out what points mean.

Thank you.
Katsuya

-----Original Message-----
From: Compagnon Raphaël [mailto:***@hefr.ch]
Sent: Thursday, April 12, 2018 2:38 PM
To: Radiance general discussion
Subject: Re: [Radiance-general] Any method to calculate sky view factor in Radiance?

Hello

A simple approach is to compute the illuminance level under a uniform sky.
First define a uniform sky (uni.rad) like this:

void glow sky_glow
0
0
4 0.318309886 0.318309886 0.318309886 0
sky_glow source sky
0
0
4 0 0 1 180

Note that the radiance value 0.318309886=1/PI This makes the illuminance value computed for an unobstructed horizontal plane equal to 1 and this matches in fact the SVF value!


To compute SVF values for several points, then use rtrace with option -I like this:


oconv uni.rad >uni.oct
cat points | rtrace -h -ab 1 -I uni.oct | rcalc -e 'SVF=$1;$1=SVF;'

where points is a file where calculation points are stored as:
x y z xdir ydir zdir

For instance using these three points you can check that SVF values are well computed as 1 for an horizontal plane and 0.5 for vertical planes:
0 0 0 0 0 1
0 0 0 0 1 0
0 0 0 1 0 0

Of course SVF values are usually more interesting to compute for scenes containing objects... These should be defined in a scene file and then merged in the octree before doint the SVF calculations:


oconv uni.rad myscene.rad >scene.oct
cat points | rtrace -h -ab 1 -I scene.oct | rcalc -e 'SVF=$1;$1=SVF;'


Hope this will help you!
Raphaël







________________________________
De : Katsuya Obara <***@arup.com> Envoyé : jeudi 12 avril 2018 01:54:46 À : radiance-***@radiance-online.org
Objet : [Radiance-general] Any method to calculate sky view factor in Radiance?

Dear all,

I want to calculate sky view factor.
Trying to find in google, I could not find solid information which I can refer to.
Could anyone tell me what kind of approach I can have to calculate sky view factor?

Thank you.
Katsuya


____________________________________________________________
Electronic mail messages entering and leaving Arup business systems are scanned for viruses and acceptability of content

[Germán Molina Larrain]

Hi Katsuya,

*Points *should be the name of a file containing the location (Px,Py,Pz)
and orientation (Dx,Dy,Dz) of your "illuminance sensors". Something like

0 0 0.8 0 0 1
1 0 0.8 0 0 1

Such case would represent two sensors, one on the position X=0, Y=0, Z=0.8
and one in position X=1, Y=0, Z=0.8... both are looking Up.

I would recommend you to also check tutorials on how the "cat" command
works (it is easy, though... it only prints the contents of a file into the
terminal) and about piping. That would give you a better understanding on
what that command is doing

Best,

El vie., 13 abr. 2018 a las 11:38, Katsuya Obara (<***@arup.com>)
escribió:

> Dear Raphael,
>
> Thank you very much for your answer.
> Since I am not familiar with Unix, may I ask you how I should write in
> Microsoft batch file for following part?
> cat points | rtrace -h -ab 1 -I uni.oct | rcalc -e 'SVF=$1;$1=SVF;'
> Especially, I could not figure out what points mean.
>
> Thank you.
> Katsuya
>
> -----Original Message-----
> From: Compagnon Raphaël [mailto:***@hefr.ch]
> Sent: Thursday, April 12, 2018 2:38 PM
> To: Radiance general discussion
> Subject: Re: [Radiance-general] Any method to calculate sky view factor in
> Radiance?
>
> Hello
>
> A simple approach is to compute the illuminance level under a uniform sky.
> First define a uniform sky (uni.rad) like this:
>
> void glow sky_glow
> 0
> 0
> 4 0.318309886 0.318309886 0.318309886 0
> sky_glow source sky
> 0
> 0
> 4 0 0 1 180
>
> Note that the radiance value 0.318309886=1/PI This makes the illuminance
> value computed for an unobstructed horizontal plane equal to 1 and this
> matches in fact the SVF value!
>
>
> To compute SVF values for several points, then use rtrace with option -I
> like this:
>
>
> oconv uni.rad >uni.oct
> cat points | rtrace -h -ab 1 -I uni.oct | rcalc -e 'SVF=$1;$1=SVF;'
>
> where points is a file where calculation points are stored as:
> x y z xdir ydir zdir
>
> For instance using these three points you can check that SVF values are
> well computed as 1 for an horizontal plane and 0.5 for vertical planes:
> 0 0 0 0 0 1
> 0 0 0 0 1 0
> 0 0 0 1 0 0
>
> Of course SVF values are usually more interesting to compute for scenes
> containing objects... These should be defined in a scene file and then
> merged in the octree before doint the SVF calculations:
>
>
> oconv uni.rad myscene.rad >scene.oct
> cat points | rtrace -h -ab 1 -I scene.oct | rcalc -e 'SVF=$1;$1=SVF;'
>
>
> Hope this will help you!
> Raphaël
>
>
>
>
>
>
>
> ________________________________
> De : Katsuya Obara <***@arup.com> Envoyé : jeudi 12 avril 2018
> 01:54:46 À : radiance-***@radiance-online.org
> Objet : [Radiance-general] Any method to calculate sky view factor in
> Radiance?
>
> Dear all,
>
> I want to calculate sky view factor.
> Trying to find in google, I could not find solid information which I can
> refer to.
> Could anyone tell me what kind of approach I can have to calculate sky
> view factor?
>
> Thank you.
> Katsuya
>
>
> ____________________________________________________________
> Electronic mail messages entering and leaving Arup business systems are
> scanned for viruses and acceptability of content
>
> _______________________________________________
> Radiance-general mailing list
> Radiance-***@radiance-online.org
>
> https://secure-web.cisco.com/1Yc5p1jP-sS9GSQOhea6eAvW2j3Mv6gjSilmNn0jJhXvvKTjGAYYE7a2pID0EaTYngTw7vjB6lGhdqxL-dUpmViFpZnymqVpJzYUn27CZNVeNFHbRwlX8Wl6KmmIvNSOGZOFQGJM9zLT0jaORSNdNOgyQ_9j_vagh8pBtQwEDEnW9ltvRUpbDylNJEeU8Hz4FkXlbpdak2LtUJZpjXE7YX2rbe2ngiLG1qD-koTRWavtRn1oW3SLOdY1A8fDRybYd/https%3A%2F%2Fwww.radiance-online.org%2Fmailman%2Flistinfo%2Fradiance-general
>
>
> _______________________________________________
> Radiance-general mailing list
> Radiance-***@radiance-online.org
> https://www.radiance-online.org/mailman/listinfo/radiance-general
>

[冷面寒枪]

You can use windows power shell to execute Unix command.



Or you can revised the unix command as following:
type points | rtrace -h -ab 1 -I uni.oct | rcalc -e 'SVF=$1;$1=SVF;'
------------------
Yongqing Zhao
Changsha Green Building & Energy Saving Technology CO.,LTD
NO.438,Shaoshan Road,Changsha,Hunan,China
Telephone:[phone]
Email:***@126.com
***@qq.com








------------------ Ô­ÊŒÓÊŒþ ------------------
·¢ŒþÈË: "Germš¢n Molina Larrain"<***@gmail.com>;
·¢ËÍʱŒä: 2018Äê4ÔÂ13ÈÕ(ÐÇÆÚÎå) ÉÏÎç9:23
ÊÕŒþÈË: "Radiance general discussion"<radiance-***@radiance-online.org>;

Ö÷Ìâ: Re: [Radiance-general] Any method to calculate sky view factor inRadiance?



Hi Katsuya,


Points should be the name of a file containing the location (Px,Py,Pz) and orientation (Dx,Dy,Dz) of your "illuminance sensors". Something like

0 0 0.8 0 0 1
1 0 0.8 0 0 1


Such case would represent two sensors, one on the position X=0, Y=0, Z=0.8 and one in position X=1, Y=0, Z=0.8... both are looking Up.


I would recommend you to also check tutorials on how the "cat" command works (it is easy, though... it only prints the contents of a file into the terminal) and about piping. That would give you a better understanding on what that command is doing


Best,


El vie., 13 abr. 2018 a las 11:38, Katsuya Obara (<***@arup.com>) escribiš®:

Dear Raphael,

Thank you very much for your answer.
Since I am not familiar with Unix, may I ask you how I should write in Microsoft batch file for following part?
cat points | rtrace -h -ab 1 -I uni.oct | rcalc -e 'SVF=$1;$1=SVF;'
Especially, I could not figure out what points mean.

Thank you.
Katsuya

-----Original Message-----
From: Compagnon Rapha0Š5l [mailto:***@hefr.ch]
Sent: Thursday, April 12, 2018 2:38 PM
To: Radiance general discussion
Subject: Re: [Radiance-general] Any method to calculate sky view factor in Radiance?

Hello

A simple approach is to compute the illuminance level under a uniform sky.
First define a uniform sky (uni.rad) like this:

void glow sky_glow
0
0
4 0.318309886 0.318309886 0.318309886 0
sky_glow source sky
0
0
4 0 0 1 180

Note that the radiance value 0.318309886=1/PI This makes the illuminance value computed for an unobstructed horizontal plane equal to 1 and this matches in fact the SVF value!


To compute SVF values for several points, then use rtrace with option -I like this:


oconv uni.rad >uni.oct
cat points | rtrace -h -ab 1 -I uni.oct | rcalc -e 'SVF=$1;$1=SVF;'

where points is a file where calculation points are stored as:
x y z xdir ydir zdir

For instance using these three points you can check that SVF values are well computed as 1 for an horizontal plane and 0.5 for vertical planes:
0 0 0 0 0 1
0 0 0 0 1 0
0 0 0 1 0 0

Of course SVF values are usually more interesting to compute for scenes containing objects... These should be defined in a scene file and then merged in the octree before doint the SVF calculations:


oconv uni.rad myscene.rad >scene.oct
cat points | rtrace -h -ab 1 -I scene.oct | rcalc -e 'SVF=$1;$1=SVF;'


Hope this will help you!
Rapha0Š5l







________________________________
De : Katsuya Obara <***@arup.com> EnvoyšŠ : jeudi 12 avril 2018 01:54:46 0†8 : radiance-***@radiance-online.org
Objet : [Radiance-general] Any method to calculate sky view factor in Radiance?

Dear all,

I want to calculate sky view factor.
Trying to find in google, I could not find solid information which I can refer to.
Could anyone tell me what kind of approach I can have to calculate sky view factor?

Thank you.
Katsuya


____________________________________________________________
Electronic mail messages entering and leaving Arup business systems are scanned for viruses and acceptability of content

_______________________________________________
Radiance-general mailing list
Radiance-***@radiance-online.org
https://secure-web.cisco.com/1Yc5p1jP-sS9GSQOhea6eAvW2j3Mv6gjSilmNn0jJhXvvKTjGAYYE7a2pID0EaTYngTw7vjB6lGhdqxL-dUpmViFpZnymqVpJzYUn27CZNVeNFHbRwlX8Wl6KmmIvNSOGZOFQGJM9zLT0jaORSNdNOgyQ_9j_vagh8pBtQwEDEnW9ltvRUpbDylNJEeU8Hz4FkXlbpdak2LtUJZpjXE7YX2rbe2ngiLG1qD-koTRWavtRn1oW3SLOdY1A8fDRybYd/https%3A%2F%2Fwww.radiance-online.org%2Fmailman%2Flistinfo%2Fradiance-general


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[Guglielmetti, Robert]

Also, substitute the ‘type’ command for ‘cat’ if you’re on Windows. At least back in the day, that was the only substitute. Maybe on newer Windows systems there’s a cat available.(?)

From: Germán Larrain <***@gmail.com>
Reply-To: Radiance discussion <radiance-***@radiance-online.org>
Date: Thursday, April 12, 2018 at 7:27 PM
To: Radiance discussion <radiance-***@radiance-online.org>
Subject: Re: [Radiance-general] Any method to calculate sky view factor in Radiance?

Hi Katsuya,
Points should be the name of a file containing the location (Px,Py,Pz) and orientation (Dx,Dy,Dz) of your "illuminance sensors". Something like

0 0 0.8 0 0 1
1 0 0.8 0 0 1
Such case would represent two sensors, one on the position X=0, Y=0, Z=0.8 and one in position X=1, Y=0, Z=0.8... both are looking Up.
I would recommend you to also check tutorials on how the "cat" command works (it is easy, though... it only prints the contents of a file into the terminal) and about piping. That would give you a better understanding on what that command is doing
Best,

El vie., 13 abr. 2018 a las 11:38, Katsuya Obara (<***@arup.com<mailto:***@arup.com>>) escribió:
Dear Raphael,

Thank you very much for your answer.
Since I am not familiar with Unix, may I ask you how I should write in Microsoft batch file for following part?
cat points | rtrace -h -ab 1 -I uni.oct | rcalc -e 'SVF=$1;$1=SVF;'
Especially, I could not figure out what points mean.

Thank you.
Katsuya

-----Original Message-----
From: Compagnon Raphaël [mailto:***@hefr.ch<mailto:***@hefr.ch>]
Sent: Thursday, April 12, 2018 2:38 PM
To: Radiance general discussion
Subject: Re: [Radiance-general] Any method to calculate sky view factor in Radiance?

Hello

A simple approach is to compute the illuminance level under a uniform sky.
First define a uniform sky (uni.rad) like this:

void glow sky_glow
0
0
4 0.318309886 0.318309886 0.318309886 0
sky_glow source sky
0
0
4 0 0 1 180

Note that the radiance value 0.318309886=1/PI This makes the illuminance value computed for an unobstructed horizontal plane equal to 1 and this matches in fact the SVF value!


To compute SVF values for several points, then use rtrace with option -I like this:


oconv uni.rad >uni.oct
cat points | rtrace -h -ab 1 -I uni.oct | rcalc -e 'SVF=$1;$1=SVF;'

where points is a file where calculation points are stored as:
x y z xdir ydir zdir

For instance using these three points you can check that SVF values are well computed as 1 for an horizontal plane and 0.5 for vertical planes:
0 0 0 0 0 1
0 0 0 0 1 0
0 0 0 1 0 0

Of course SVF values are usually more interesting to compute for scenes containing objects... These should be defined in a scene file and then merged in the octree before doint the SVF calculations:


oconv uni.rad myscene.rad >scene.oct
cat points | rtrace -h -ab 1 -I scene.oct | rcalc -e 'SVF=$1;$1=SVF;'


Hope this will help you!
Raphaël







________________________________
De : Katsuya Obara <***@arup.com<mailto:***@arup.com>> Envoyé : jeudi 12 avril 2018 01:54:46 À : radiance-***@radiance-online.org<mailto:radiance-***@radiance-online.org>
Objet : [Radiance-general] Any method to calculate sky view factor in Radiance?

Dear all,

I want to calculate sky view factor.
Trying to find in google, I could not find solid information which I can refer to.
Could anyone tell me what kind of approach I can have to calculate sky view factor?

Thank you.
Katsuya


____________________________________________________________
Electronic mail messages entering and leaving Arup business systems are scanned for viruses and acceptability of content

_______________________________________________
Radiance-general mailing list
Radiance-***@radiance-online.org<mailto:Radiance-***@radiance-online.org>
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[Compagnon Raphaël]

Hi Katsuya

Yes German's explanation about the content of the point file is right.
If you plan to use Radiance extensively, I really advise you to start using it on a Unix/Linux system for instance by installing a Linux virtual machine on your PC (I am personally using a Ubuntu Linux system running in VirtualBox https://www.virtualbox.org). I am sure you will never regret the time you will have to spend just for learning the basics of a Unix/Linux system...

Raphaël

________________________________
De : Germán Molina Larrain <***@gmail.com>
Envoyé : vendredi 13 avril 2018 03:23:11
À : Radiance general discussion
Objet : Re: [Radiance-general] Any method to calculate sky view factor in Radiance?

Hi Katsuya,

Points should be the name of a file containing the location (Px,Py,Pz) and orientation (Dx,Dy,Dz) of your "illuminance sensors". Something like

0 0 0.8 0 0 1
1 0 0.8 0 0 1

Such case would represent two sensors, one on the position X=0, Y=0, Z=0.8 and one in position X=1, Y=0, Z=0.8... both are looking Up.

I would recommend you to also check tutorials on how the "cat" command works (it is easy, though... it only prints the contents of a file into the terminal) and about piping. That would give you a better understanding on what that command is doing

Best,

El vie., 13 abr. 2018 a las 11:38, Katsuya Obara (<***@arup.com<mailto:***@arup.com>>) escribió:
Dear Raphael,

Thank you very much for your answer.
Since I am not familiar with Unix, may I ask you how I should write in Microsoft batch file for following part?
cat points | rtrace -h -ab 1 -I uni.oct | rcalc -e 'SVF=$1;$1=SVF;'
Especially, I could not figure out what points mean.

Thank you.
Katsuya

-----Original Message-----
From: Compagnon Raphaël [mailto:***@hefr.ch<mailto:***@hefr.ch>]
Sent: Thursday, April 12, 2018 2:38 PM
To: Radiance general discussion
Subject: Re: [Radiance-general] Any method to calculate sky view factor in Radiance?

Hello

A simple approach is to compute the illuminance level under a uniform sky.
First define a uniform sky (uni.rad) like this:

void glow sky_glow
0
0
4 0.318309886 0.318309886 0.318309886 0
sky_glow source sky
0
0
4 0 0 1 180

Note that the radiance value 0.318309886=1/PI This makes the illuminance value computed for an unobstructed horizontal plane equal to 1 and this matches in fact the SVF value!


To compute SVF values for several points, then use rtrace with option -I like this:


oconv uni.rad >uni.oct
cat points | rtrace -h -ab 1 -I uni.oct | rcalc -e 'SVF=$1;$1=SVF;'

where points is a file where calculation points are stored as:
x y z xdir ydir zdir

For instance using these three points you can check that SVF values are well computed as 1 for an horizontal plane and 0.5 for vertical planes:
0 0 0 0 0 1
0 0 0 0 1 0
0 0 0 1 0 0

Of course SVF values are usually more interesting to compute for scenes containing objects... These should be defined in a scene file and then merged in the octree before doint the SVF calculations:


oconv uni.rad myscene.rad >scene.oct
cat points | rtrace -h -ab 1 -I scene.oct | rcalc -e 'SVF=$1;$1=SVF;'


Hope this will help you!
Raphaël







________________________________
De : Katsuya Obara <***@arup.com<mailto:***@arup.com>> Envoyé : jeudi 12 avril 2018 01:54:46 À : radiance-***@radiance-online.org<mailto:radiance-***@radiance-online.org>
Objet : [Radiance-general] Any method to calculate sky view factor in Radiance?

Dear all,

I want to calculate sky view factor.
Trying to find in google, I could not find solid information which I can refer to.
Could anyone tell me what kind of approach I can have to calculate sky view factor?

Thank you.
Katsuya


____________________________________________________________
Electronic mail messages entering and leaving Arup business systems are scanned for viruses and acceptability of content

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