Hi all,

to start with, I am using the Radiance tool as implemented in a
different software suite, but I imagine that this is fairly
irrelevant.

I am looking at daylight factors in classrooms using CIE uniform sky,
and at the use of light wells to "brighten up" the back of deep
classrooms. I want the maximum amount of light possible been
channeled down the light well, so I thought that some aluminium foil
coating could be used. For this coating I used the following values:
R-Refl = 0.91, B-Refl = 0.92, G-Refl = 0.92 (this is roughly the
reflectance of polished aluminium at the different wavelength for
Red, Green, Blue). For specularity.... I took the average of the 3
values, so I used 0.917 (this is a pure guess, but I thought that  a
value of between 0.9 and 1.0 would have been appropriate - ok maybe
1.0 would have been too optimistic, so any 0.9, 0.925, 0.95 would
have been good). I assumed the surface to be polished, hence
roughness = 0.

Is this approach valid.. or did I completely miss the point?
Where can I find some guidance? For example, how would I go to
simulate a mirror?

many thanks,

willy

Hello Willy,

I can't see why your approach shouldn't work apart from:- your not
specifying what software you are using, and the interreflections
being a problem when using many verily highly specular surfaces.

So far as materials go, for mirror in Radiance I would use MIRROR
material! Hasn't the software you use got this material? For specular-
reflector-lightpipe/in-lightwell I would use the mkillum program as
the skylight source at the top as well. Doesn't the software have
that function?

Were you aware of the guidance on Radiance material types for
Rayfront (at http://www.schorsch.com/rayfront/manual/matdef.html ),
which uses Radiance materials formats and engines? Tis most helpful,
I think. As it says, a value >0.1 for specularity is 'unusual'. Hmmm.

Good luck.

Regards,
George
<<>><<>><<>>
--- In DesktopRadiance@yahoogroups.com, "willyfaber" <willy.pane@...>
wrote:
>
> Hi all,
>
> to start with, I am using the Radiance tool as implemented in a
> different software suite, but I imagine that this is fairly
> irrelevant.
>
> I am looking at daylight factors in classrooms using CIE uniform
sky,
> and at the use of light wells to "brighten up" the back of deep
> classrooms. I want the maximum amount of light possible been
> channeled down the light well, so I thought that some aluminium
foil
> coating could be used. For this coating I used the following values:
> R-Refl = 0.91, B-Refl = 0.92, G-Refl = 0.92 (this is roughly the
> reflectance of polished aluminium at the different wavelength for
> Red, Green, Blue). For specularity.... I took the average of the 3
> values, so I used 0.917 (this is a pure guess, but I thought that
a
> value of between 0.9 and 1.0 would have been appropriate - ok maybe
> 1.0 would have been too optimistic, so any 0.9, 0.925, 0.95 would
> have been good). I assumed the surface to be polished, hence
> roughness = 0.
>
> Is this approach valid.. or did I completely miss the point?
> Where can I find some guidance? For example, how would I go to
> simulate a mirror?
>
> many thanks,
>
> willy
>

Hello George,
TY for coming back to us.
The software that I am using is the Radiance Module of the IES
(APACHE) suite. This is mostly used for thermal prediction,
overheating, also compliance with local building regulation,
ventilation studies etc. The mein reason I mentioned the fact that it
was not RADIANCE or DESKTOP RADIANCE is because the data inputting
maybe (and probably is) completely different (unfortunately I have
never used RADIANCE - I am not allowed to have an old AutoCAD version
which had the add-on RADIANCE module, so don't know for sure). I do
not have a library of materials from which to choose, for example,
the "MIRROR"; instead, I assign materials/surface properties to the
wall, windows etc. Likewise, I am sure that you have your libraries,
but you can also modify them and add different/new materials, or
change the value slightly; glass manufacturers, for example, are
continuosly producing new coatings with different properties etc.

TY very much for the link, it seems to confirm that I am not 100
miles away; infact I can see, for example, that the "metal material
types" use 1.0 for full specularity and 0.5 for a "dirty" mirror.
Ideally I would need a " wavy" funtion to my specularity, but I do
not have a "METAL2" definition. No biggies, this is probably outside
the scope of my work, which is only to check DF in classrooms to see
if they comply with the reccomended guidelines.

With regards to mkillum, I think that I have seen "functions"
somewhere, but I have never used any before and I cannot check right
now (License availlability issues).

TY again,
Regards,

Willy


--- In DesktopRadiance@yahoogroups.com, "g_a_chadwick"
<g_a_chadwick@...> wrote:
>
> Hello Willy,
>
> I can't see why your approach shouldn't work apart from:- your not
> specifying what software you are using, and the interreflections
> being a problem when using many verily highly specular surfaces.
>
> So far as materials go, for mirror in Radiance I would use MIRROR
> material! Hasn't the software you use got this material? For
specular-
> reflector-lightpipe/in-lightwell I would use the mkillum program as
> the skylight source at the top as well. Doesn't the software have
> that function?
>
> Were you aware of the guidance on Radiance material types for
> Rayfront (at http://www.schorsch.com/rayfront/manual/matdef.html ),
> which uses Radiance materials formats and engines? Tis most
helpful,
> I think. As it says, a value >0.1 for specularity is 'unusual'.
Hmmm.
>
> Good luck.
>
> Regards,
> George
> <<>><<>><<>>
> --- In DesktopRadiance@yahoogroups.com, "willyfaber" <willy.pane@>
> wrote:
> >
> > Hi all,
> >
> > to start with, I am using the Radiance tool as implemented in a
> > different software suite, but I imagine that this is fairly
> > irrelevant.
> >
> > I am looking at daylight factors in classrooms using CIE uniform
> sky,
> > and at the use of light wells to "brighten up" the back of deep
> > classrooms. I want the maximum amount of light possible been
> > channeled down the light well, so I thought that some aluminium
> foil
> > coating could be used. For this coating I used the following
values:
> > R-Refl = 0.91, B-Refl = 0.92, G-Refl = 0.92 (this is roughly the
> > reflectance of polished aluminium at the different wavelength for
> > Red, Green, Blue). For specularity.... I took the average of the
3
> > values, so I used 0.917 (this is a pure guess, but I thought
that
> a
> > value of between 0.9 and 1.0 would have been appropriate - ok
maybe
> > 1.0 would have been too optimistic, so any 0.9, 0.925, 0.95 would
> > have been good). I assumed the surface to be polished, hence
> > roughness = 0.
> >
> > Is this approach valid.. or did I completely miss the point?
> > Where can I find some guidance? For example, how would I go to
> > simulate a mirror?
> >
> > many thanks,
> >
> > willy
> >
>

Dear Chas

I want to install Radiance 1.02 and downloaded it, but I can't do it
because it needs a password for uncompressing th Zip file. I really
appreciate you if you can tell me how to do that.

I am looking forward to hearing from you.
Best regards,
Majid Miri

--- In DesktopRadiance@yahoogroups.com, "Charles Ehrlich"
<ckehrlich@...> wrote:
>
>
> My apologies to all those who have been unable to download
> Desktop Radiance 1.02.
>
> We have been having problems with our MS FrontPage server.
> I think we now have it under control, including the addition
> of an ftp download option.
>
> To download the software, you must either log in with an
> existing email and password, or fill out the registraion
> form anew.  You can also request your password to be sent
> to your email address if you have forgotten it.  The link
> is:  http://radsite.lbl.gov/deskrad/download/
>
> -Chas
>

There is some discussion of this in the Rendering with Radiance book.
If you are only concerned with the color appearance of the final
rendering, you can simply adjust the RGB values of the sources being
used.

If you want to effect calculations of illuminance values (lx,fc), then
you're going to have to wait until my thesis is done. I am currently
developing a script to account for the SPDs of sources and the
reflectance distributions of surfaces in radiance calculations.

  - Matt Brugman


--- In DesktopRadiance@yahoogroups.com, majid miri <maj_miri@...> wrote:
>
> Dear all,
>
>   Does someone have some knowledge about how can we make an interior
computer rendering under different light sources with different
Spectral Power Distribution?
>
>   Thank you,
>
>   Majid
>
>
> ---------------------------------
> Be a better friend, newshound, and know-it-all with Yahoo! Mobile.
Try it now.
>

hi,
Can DR simulate a self-luminous wall or window? Can I create a new
luminaire, and define the self-luminous object as a luminaire?
I try to define a new luminaire in DR, but after I follow all the steps
in DR, I get the error which says "Couldn't open imposter geometry file
for parsing!". Can someone tell me a more clear figure to do this? or
tell me another way to create a new luminaire. Thanks a lot.

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und einen Superrutsch in ein gesundes und erfolgreiches 2009!



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Tel.: +43 5223 43112

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Mob.: +43 676 8412 11280

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Hello!

How can I measure the working plane illuminance by using the Radiance?
Because I have tried so many times, and looked everywhere on the
Internet, but still cannot find out the method to estimate the
required result, but here's only the illuminance level of the wall,
ceiling and wall. could anyone tell me about the process of evaluating
the illuminance level of working plane (0.8m above floor)?
Now I am using ECOTECT for the simulation experiments.

Thank you very much in advance!

Hi Vangelis!

Thank you very much for your attention.

I've tried to do so by importing (in Grid Management) RADIANCE results
to ECOTECT (version 5.60) in .DAT format (035.dat,087.dat), but values
are totally wrong than in RADIANCE.

I will have a try your method.

Thanks!

Iskandar.


--- In DesktopRadiance@yahoogroups.com, Evangelos Christakou
<vangelis@...> wrote:
>
> Dear all,
> To get illuminance on the working level you have to export and
calculate it
> on RADIANCE for Windows and import the results into ECOTECT.
> Inside Ecotect's HELP files, you find:
>
> Output to RADIANCE
> >
>
>
> > Ecotect includes support for the automatic generation of material
data and
> > control files (RIF files), as well as various CIE sky models. To
output a
> > set of RAD and RIF files, select the Export... item from the File
menu and
> > select RADIANCE Scene File as the type of file. You can also use
the RADIANCE
> > button in the Export Manager panel. For more details on the options
> > available when creating these files, see the RADIANCE Export dialog.
>
>
> Inside Export Manager (RADIANCE CONTROL  PANEL) you select to export
> illuminance points to " Surface and/Point Analisys" so after
calculation,
>  all you have to do do is: Inside ECOTECT press F5 (plan) and select
> RADIANCE results in menu (right side) "Analisys Grid" and " voillá"
!!!!  [?]
>
>
> If you need any futher help....
>
> Sorry for my poor english.
>
> cheers,
>
> vangelis
>
>
> On Wed, Jan 14, 2009 at 8:37 AM, iskandaruz <iskandaruz@...> wrote:
>
> >   Hello!
> >
> > How can I measure the working plane illuminance by using the Radiance?
> > Because I have tried so many times, and looked everywhere on the
> > Internet, but still cannot find out the method to estimate the
> > required result, but here's only the illuminance level of the wall,
> > ceiling and wall. could anyone tell me about the process of evaluating
> > the illuminance level of working plane (0.8m above floor)?
> > Now I am using ECOTECT for the simulation experiments.
> >
> > Thank you very much in advance!
> >
> >
> >
>

I am very new with radiance.. I am trying to work in linux. I wanna
use gensurf command.for that I need to know which type of file should
be used as input. an image file or something else.. I have tried some
mesh data but its showing bad number of data points..

Please help me out.

hi, I am a college student doing a urban design project for my professor. The
purpose of the project is to evaluate human behavior based on the light level in
a room.

I understand radiance can simulation time, date, etc. But when I used image
analysis, it only gives me a number output of a workplane(ex: a desk). Is there
anyway I can have a average number of illuminance in a room? then the user could
decide if to turn the light on or off based on his/her preference. Also, is
there a way to set the light on/off when I proceed the simulation.

Thank you.

Hi, my is Germán Osma, I'm student master in green buildings. Few days ago, I
downloaded DESKTOP-RADIANCE. But I need to know some things to begin to use it.
1. In the manual says that I should install AUTOCAD 2000 or R14, but I have
AUTOCAD 2008, and not you how to make it work.
2. Are the manuals for RADIANCE-LINUX useful for DESKTOP-RADIANCE?
3. How do I work DESKTOP-RADIANCE without ECOTECT and AUTOCAD? Should I work in
D.O.S.? Because, when I active the icon-DOS appears the TEXT EDITOR DOS, and I
don´t know how start.

thanks for your attention!!!

--- In DesktopRadiance@yahoogroups.com, "german_osma" <gerard_9962@...> wrote:
>
> Hi, my is Germán Osma, I'm student master in green buildings. Few days ago, I
downloaded DESKTOP-RADIANCE. But I need to know some things to begin to use it.
> 1. In the manual says that I should install AUTOCAD 2000 or R14, but I have
AUTOCAD 2008, and not you how to make it work.
> 2. Are the manuals for RADIANCE-LINUX useful for DESKTOP-RADIANCE?
> 3. How do I work DESKTOP-RADIANCE without ECOTECT and AUTOCAD? Should I work
in D.O.S.? Because, when I active the icon-DOS appears the TEXT EDITOR DOS, and
I don´t know how start.
>
> thanks for your attention!!!
>
Furthermore, the time of the TRIAL of ECOTECT was just me.

Not sure where to get the password to use radiance after installation...any
advice?

I've already taken the download from the website and it mentioned to enter the
password received after registration, just not sure where to find it.

Hello,

I just went through the set up process, and I am having problems with getting
the desktop Radiance shortcut to open.  "It says the item 'acad.exe' that this
shortcut refers to has been changed or moved, so this shortcut will no longer
work properly. Do you want to delete this shortcut?"  I currently only have
AutoCAD2005, and think this might be part of the problem.

Any thoughts or tips are appreciated!

Thanks!!!

Hi ,
I am trying to model a simple sheet of prismatic glazing, but am unclear of the
dimension variable set out in the PMAP user manual for the prism command.
Could anyone please forward me a drawing or sketch of what this command is
based?

I will create the model in Ecotect 2010 first then I'll export it to Desktop
Radiance and then I'll change the scene file Material to Prism2 .

Evangelos
thanks for the quick response , but what I meant is what should i put for the A1
and A2 values ? in the  following definition :

mod prism2 id
         9+ coef1 dx1 dy1 dz1 coef2 dx2 dy2 dz2 funcfile transform
         0
         n A1 A2 .. An

can anyone explain to me what should I put for the variables above and do they
mean?

thanks
Rania

I've read this article about importing Desktop Radiance back into Ecotect , the
article is located here http://naturalfrequency.com/articles/radiancedf   
scroll all the way down to : Grid Point Illuminances.

I followed all the steps mentioned in the article , but using this way won't
allow me to run the project in Desktop Radiance ,it just runs the results in the
background then a message pops up saying do you want to import the results into
Ecotect? .

  I would like to change and edit some materials in DR control panel first before
Exporting the results back to ecotect . is there anyway to open the project in
DR and edit the materials then export the .DAT file to Ecotet to display the
daylight factor over Ecotect's Grid ?



thanks

I have a  question about desktop radiance , I know this May be someone here can
help . I'm using. Ecotect to create a model of a simple room with a window that
has two horizontal panels then I export the model to desktop radiance , in
radiance I change the top panel to prismatic glazzing using the prism2 material
and the prism.Cal file , I need to calcuale the illuminace ( lux or fc ) at
different sensor points , possibly the grid points I created at ecotect , I need
this calculation before and after the material change , I was able to get the
before one using ectoct's import the grid results option. But I can't seem to
figure a way to obtain the after results using desktop radiance.
Help any one .
Or any suggestions of different software that I can use to do this , that works
with windows system.

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Hi , I'm trying to render a very simple classroom with one window with DR 2.0 /
Autocad 14/ and windows 98 . I didn't place any artificial lights because I only
want natural light in my simulation , after the rendering is complete the window
looks completely black , it is like a black rectangle on the wall , however I
can see the walls , floor and ceiling correctly . Please help.

Geachte heer, mevrouw,

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Vriendelijke groet,

Peter van Heun
CDC