[Radiance-general] Desktop Radiance and IES

[John Mardaljevic]

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)

jm at dmu.ac.uk
http://www.iesd.dmu.ac.uk/~jm