Re: [Brad] Help:Setting up a radiance system--brad

[steve michel]

Thanks Rob for ltview; it did allow me to quickly 'preview' a lighting 
fixture via radiance and see the difference with brad's output.

I took the liberty of attaching my results.

Thomas: your item #5 in the list of brad procedures worked successfully to 
export my lighting data to radiance. For Brad export  I positioned my 
lightsource close to a surface to 'see' its 'signature'.  The obvious 
hypothesis for a and up/down T5 geometry is a linear shaped illumination on 
a horizontal surface (one foot from the ceiling) but I was getting a 
circular shape (see attached file) and also strange, the lighting polygon is 
casting a shadow on the cube (no other object in the room). It appears as 
though a wrong circular is positioned above the self-luminous polygon.

Any feedback on interpreting these results and/or a work around solution 
would help.

regards
Steve







> From: Rob Guglielmetti <address@hidden>
> Reply-To: address@hidden, address@hidden
> To: address@hidden
> Subject: Re: [Brad] Help:Setting up a radiance system--brad
> Date: Thu, 19 Apr 2007 11:11:13 -0600
>
> This may or may not help you, but I've attached a shell script I wrote 
> called ltview.  This takes a luminaire.rad file that was created with the 
> ies2rad utility and loads  in a box with one side removed, increases the 
> -ds parameter (so the light pattern is better defined) and sets up a view 
> looking into the box along the y axis, in rvu.  It's just a handy little 
> way to spot check that your ies2rad went smoothly.  I have used this to 
> uncover errors in the ies files before.
>
> The -bs switch controls the size of the box; the default is 24, because I 
> used to work in inches in my previous life.  That would give me a 4' square 
> box.  So to use this with a luminaire file that you converted in meters, 
> set -bs to .61 or so, for a  box that would just contain a 4' fixture.   
> You  can of course make the box any size you want, but I usually make it 
> tight to the fixture so that I can see the beam accurately.
>
> I'm not using Brad at the moment so I can't give specific advice with those 
> issues, but I thought I'd offer my utility as a useful spot checker.
>
> - Rob Guglielmetti


> << ltview.zip >>


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ltview-t5-test.png
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Brad-t5-test.png
Description: PNG image