[Radiance-general] Radiance, objline, objpict etc..

[Rob Guglielmetti]

On Jan 27, 2008, at 5:31 PM, Jack de Valpine wrote:
> I have always advocated that whenever anyone is using ies  
> photometric data, one should create a simple test box to place the  
> output of ies2rad into in order to quickly view what is going on.  
> This way you can see if the things are behaving the way they need  
> and/or if they need additional transforms to get things in the  
> correct location/orientation.

I wholeheartedly agree.  I wrote a quick script (well actually it's  
just a modified copy of the objview script) to do this a few years  
ago; the link has been bused for a while now, but I just fixed it:

http://www.rumblestrip.org/downloads/ltview.tgz

ltview takes a radiance luminaire description (output from ies2rad)  
and places it centered in a 4' square box with one side missing, and  
fires up rvu (and cranks up -ds) to display the distribution.  It has  
come in handy more than once.  Here is a link to my original blog  
post announcing its availability and explaining its use:

http://www.rumblestrip.org/2004/05/10/ltview-a-radiance-utility

And be advised that it's geared to imperial units, so if you  
converted your ies file with meters in mind, you'll need to adjust  
the -bs parameter to scale your box down so it's tighter to the  
fixture.  I think Aksel had problems with this when I first released  
it; setting -bs .63 should give you a similarly sized box for a  
metric-converted fixture.

- Rob Guglielmetti
www.rumblestrip.org

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