[Radiance-general] Help on BRTDfunc

Mon Oct 5 03:36:03 PDT 2009

yeup, your correct. I should have had a bit more of a look before my
responce. As I previously said, I've never used the BRTDfunc material
type so I'm afraid I'm not any help with the use of the funcfile??

Anyone else?

________________________________

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 11:16
To: 'Radiance general discussion'
Subject: RE: [Radiance-general] Help on BRTDfunc

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
/Presentations/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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