[Radiance-general] Help on BRTDfunc

[Edilberto Calixihan]

Hi Erik,
 
Thanks for giving some ideas on this and pointing in the right direction. I
was already stuck.
 
It seems BRTDfunc is already a material and we may not need the glass
material definition anymore (pls. correct me here).  
 
Also it may seem that we may need to add the use of glazing.cal as mentioned
in http://finance.dir.groups.yahoo.com/group/DesktopRadiance/message/14.  I
tried the below definition and it worked.  Although I'm still not sure if
this is the correct way.  Any additional clues is highly welcome.
 
void  BRTDfunc    Clear
10
      0.077     0.082     0.082
      0.857     0.894     0.877
      0 0 0
      glazing.cal
0
9 0 0 0 0 0 0 0 0 0
 
 
You're right on the same numbers of front and back reflectance from Optics 5
.rad file and will need to check the glass.  I think Optics 5 may have a bug
on Radiance export but will verify:
http://www.radiance-online.org/radiance-workshop5/2006_Radiance_Workshop/Pre
sentations/Ward_RadianceFeatures.pdf
 
Thanks and best regards,
Jun
 
 
From: Erik Moore [mailto:Erik.Moore at arup.com] 
Sent: Monday, October 05, 2009 4:47 PM
To: jcalixihan at cladding.com; Radiance general discussion
Subject: RE: [Radiance-general] Help on BRTDfunc
 
Hi there Jun,
 
I'm not an expert and I'm sure that someone might correct me but.... you
need to apply the modifier that you are using to the glass description. the
term 'void' means that you are not applying a modifier. Also, you will need
to change the name of the modifier (or the name of the polygons) as I think
that your polygons have been named 'clear'.
 
Try this:
 
void  BRTDfunc    01_Clear_8_front
10
      0.077     0.082     0.082
      0.857     0.894     0.877
      0 0 0
      .
0
9 0 0 0 0 0 0 0 0 0
 
01_Clear_8_front  glass   clear
0
0
3     0.934     0.974     0.955
 
Please note the order.... Radiance will need to read what the modifier is
BEFORE it can be applied to anything. I have never used this sort of
modifier before, so I'm not too sure on what the arguments are (and hence
can't comment on them..??) and I'm not too sure why you have two of them
(front and back) which are identical?
 
hope this helps. Anyone else who can correct me on anything please but in!
 
Erik
 
 
 
  _____  

From: radiance-general-bounces at radiance-online.org
[mailto:radiance-general-bounces at radiance-online.org] On Behalf Of Edilberto
Calixihan
Sent: 05 October 2009 08:21
To: radiance-general at radiance-online.org
Subject: [Radiance-general] Help on BRTDfunc
Hello!
 
I'm new to Desktop Radiance and use Ecotect to create and run the
simulations.  I need advise on using BRTDfunc.  Below is the .rad file from
Optics 5 for the clear glass that I need:
 
void  glass       01_Clear_8_glass
0
0
3     0.934     0.974     0.955
 
void  BRTDfunc    01_Clear_8_front
10
      0.077     0.082     0.082
      0.857     0.894     0.877
      0 0 0
      .
0
9 0 0 0 0 0 0 0 0 0
 
void  BRTDfunc    01_Clear_8_back
10
      0.077     0.082     0.082
      0.857     0.894     0.877
      0 0 0
      .
0
9 0 0 0 0 0 0 0 0 0
 
 
When I insert it into the my scene file (replace the default glass command
lines) I get an "unidentified modifier "Clear"" error.  Which means the
polygons referencing "Clear" cannot find the glass description, right?  I
would modify the glass description to various id combinations like the one
below but I get a "bad arguments for "Clear"" error.
 
void  glass   Clear   Clear_8_glass
0
0
3     0.934     0.974     0.955
 
void  BRTDfunc  Clear_8_front
10
      0.077     0.082     0.082
      0.857     0.894     0.877
      0 0 0
      .
0
9 0 0 0 0 0 0 0 0 0
 
void  BRTDfunc  Clear_8_back
10
      0.077     0.082     0.082
      0.857     0.894     0.877
      0 0 0
      .
0
9 0 0 0 0 0 0 0 0 0
 
 
How can I properly run BRTDfunc and the glass reflection numbers from Optics
5?
 
The one that seems to run ok is below but not sure if I got it right..
Also, we don't have a Unix pc at work but I'm interested in the newer
versions of Radiance.  Shall I start to learn Cygwin or MinGW to access
advance glass functions?  Any advice would be very helpful.
 
void  glass   Clear
0
0
3     0.934     0.974     0.955
 
 
void  BRTDfunc    Clear_8_front
10
      0.077     0.082     0.082
      0.857     0.894     0.877
      0 0 0
      .
0
9 0 0 0 0 0 0 0 0 0
 
void  BRTDfunc    Clear_8_back
10
      0.077     0.082     0.082
      0.857     0.894     0.877
      0 0 0
      .
0
9 0 0 0 0 0 0 0 0 0
 
 
 
Thanks so much!
Jun
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