[Radiance-general] IES file manipulation

[Greg Ward]

Hi Mark,

That should work -- set the three real illum arguments to zero, though, 
so it won't try to contribute to the output.

-Greg

> From: "Mark de la Fuente" <MdelaFuente at wmtao.com>
> Date: June 24, 2004 2:23:37 PM GMT+01:00
>
Greg, in this case I'm looking at a 20' linear fluorescent 
Indirect/Direct pendant.  The IES file is for a 4' section and I would 
array it 5 times.  A sphere with 2' diameter would probably not work if 
the suspension length were less than 2' since this is a partially 
indirect pendant..  Also, not sure if having the pendant poking through 
the illum sphere would work.
 
I thought of a different way of handling this.  Since the ies2rad 
program creates the top and bottom rectangles in this case, why not 
just use an illum material with a void modifier to create the edges of 
the box?
 
Thanks for the response.  It would certainly be faster to use the -i 
option.
 
Mark
 
 > Hi Mark,
 >
 > Did you try the -i option to ies2rad?
 >
 > -Greg
 >
 > From: "Mark de la Fuente" <MdelaFuente at wmtao.com>
 > Date: June 24, 2004 12:08:51 AM CEST
 >
 > Hi everyone,
 >  
 > I have a situation where I'm using ies2rad to bring files into
 > radiance.  Only I want to attach the photometric info to illum
 > surfaces surrounding my detailed fixture geometry rather than to the
 > default geometry...  (pretty typical I think) However in order to do
 > so, I have to add rectangles in order to "seal" my fixture.  I am
  > concerned that the addition of these rectangles will affect the
  > magnitude of the photometric information.
 >  
 > I guess one way to not even deal with boxing the luminaire with illums
 > is to attach a negative value to the lamp's glow material.  Then rays
 > won't "sneak out".  Of course the lamps won't add internal
 > illumination in that case.
 >  
 > Any thoughts would be appreciated.  I will try and run some tests when
 > I get a chance.
 >  
 > Thanks.
 >  
 > Mark