Desktop Radiance and IES

Hello,

Does the IES standard file format have any kind of paradigm in Desktop
Radiance or Radiance? Like say, the ability to take that IES file and use it
directly without having to re-type any parameters from the IES file into
Radiance? A converter? Or a copy and paste job?

Thanks,
Nick Calcagni

Nick,

The easiest way is to grab the Radiance format files that IES creates when it converts the 3D model from its native format for use by Radiance. Can't recall where they reside in the file system, you'll need to do a little searching. The Radiance format files should be mostly standard. There is however one exception that we found: the 'xform2' command. This is not part of the standard release and the octree conversion will fail if it encounters this command in a rad file. Similar to xform, IES uses xform2 to create rectangles of arbitrary dimension for, it seems, use as workplanes. It does this by applying arbitrary scaling in the x and y dimensions (independently) on a unit square polygon (z = 0.8) and translating the output to the desired location in the scene. I would have thought that simply creating a polygon in the right place would be a neater method, whatever. Since the xform2 commands are embedded in the scene rad files, you'll have to strip them out.

-John

···

-----------------------------------------------
Dr. John Mardaljevic
Senior Research Fellow
Institute of Energy and Sustainable Development
De Montfort University
The Gateway
Leicester
LE1 9BH, UK
+44 (0) 116 257 7972
+44 (0) 116 257 7981 (fax)

[email protected]
http://www.iesd.dmu.ac.uk/~jm

Sorry guys -- this conversation has me a little confused. Normally when we talk about "IES files," we're referring to those produced by lighting manufacturers. You must be referring to another program -- this perhaps?

  http://www.iesve.com/content/

In which case, you should be more specific so we'll know what you're talking about... If Nick was actually asking about IES luminaire files, then ies2rad is what he's looking for. TMA (too many acronyms).

Cheers,
-Greg

···

From: John Mardaljevic <[email protected]>
Date: May 21, 2008 6:20:18 AM PDT

Nick,

The easiest way is to grab the Radiance format files that IES creates when it converts the 3D model from its native format for use by Radiance. Can't recall where they reside in the file system, you'll need to do a little searching. The Radiance format files should be mostly standard. There is however one exception that we found: the 'xform2' command. This is not part of the standard release and the octree conversion will fail if it encounters this command in a rad file. Similar to xform, IES uses xform2 to create rectangles of arbitrary dimension for, it seems, use as workplanes. It does this by applying arbitrary scaling in the x and y dimensions (independently) on a unit square polygon (z = 0.8) and translating the output to the desired location in the scene. I would have thought that simply creating a polygon in the right place would be a neater method, whatever. Since the xform2 commands are embedded in the scene rad files, you'll have to strip them out.

-John

---------------

From: "Nick Calcagni" <[email protected]>
Date: May 21, 2008 12:05:45 AM PDT

Hello,

Does the IES standard file format have any kind of paradigm in Desktop Radiance or Radiance? Like say, the ability to take that IES file and use it directly without having to re-type any parameters from the IES file into Radiance? A converter? Or a copy and paste job?

Thanks,
Nick Calcagni

Greg,

Indeed, I didn't even think about the confusion that might ensue. Shows how often I model luminaires. Anyway, perhaps we should agree to refer to the suite of simulation software as IESVE rather than IES.

-John

···

-----------------------------------------------
Dr. John Mardaljevic
Senior Research Fellow
Institute of Energy and Sustainable Development
De Montfort University
The Gateway
Leicester
LE1 9BH, UK
+44 (0) 116 257 7972
+44 (0) 116 257 7981 (fax)

[email protected]
http://www.iesd.dmu.ac.uk/~jm

Yeah, I admit I initially thought he was speaking of photometric files, not building models from IESVE. Confusion reigns. John's suggestion is a good one, IMHO (he said, TiC (LOL) (YMMV))).

- Rob "Can I get an acronym?!" G.

···

On May 21, 2008, at 12:11 PM, John Mardaljevic wrote:

Greg,

Indeed, I didn't even think about the confusion that might ensue. Shows how often I model luminaires. Anyway, perhaps we should agree to refer to the suite of simulation software as IESVE rather than IES.

Pausing to think (which I should have done before), I guess Nick *did* mean the photometric file format rather than the IESVE format. I'd had a few queries recently about how to get Radiance geometry out of IESVE, and the (unhelpful in this instance) explanation might be er... helpful if you need to do the same.

-John

···

-----------------------------------------------
Dr. John Mardaljevic
Senior Research Fellow
Institute of Energy and Sustainable Development
De Montfort University
The Gateway
Leicester
LE1 9BH, UK
+44 (0) 116 257 7972
+44 (0) 116 257 7981 (fax)

[email protected]
http://www.iesd.dmu.ac.uk/~jm