[Radiance-general] 回复： Any method to calculate sky view factor inRadiance?

Thu Apr 12 18:45:53 PDT 2018

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;'
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------------------ 原始邮件 ------------------
发件人: "Germán Molina Larrain"<germolinal at gmail.com>;
发送时间: 2018年4月13日(星期五) 上午9:23
收件人: "Radiance general discussion"<radiance-general at radiance-online.org>;

主题: 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 (<katsuya.obara at 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:Raphael.Compagnon at 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 <katsuya.obara at arup.com> Envoyé : jeudi 12 avril 2018 01:54:46 À : radiance-general at 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

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