[Radiance-general] How to verify an IES file ?

[Axel Jacobs]

Hi Vaib,

just to add to Rob's comment.  There is also a new ltpict.pl script that
renders a four-view representation of the light output distribution of
a light fitting or IES file.

Conceptually, the ltview/ltpict pair is simular to objview/objpict:
One is interactive, the other renders an HDR image.

I don't think ltpict helps you with your particular problem, but I
thought this thread provides a good opportunity for promoting it.

Regards

Axel


On 23 May 2014 09:52, Vaib <vaibhavjain.co at gmail.com> wrote:
> Hi Rob,
>
> You are right, its better to check the converted IES file, to have
> confidence in what ies2rad has converted (as Thomas also pointed out). I
> just did mine using ltview.pl, and it looks okay to me. Distribution looks
> apparently similar to the polar diagram. I have included the image from
> ltview.pl in the initial report on cloud.
>
> Thanks for letting me know about the script.
>
> Best regards,
> Vaibhav
>
>
>
>
> On 23 May 2014 02:18, Guglielmetti, Robert <Robert.Guglielmetti at nrel.gov>
> wrote:
>>
>> I'm late to this party, but I'd add that Axel Jacobs recently added a
>> great Perl script to Radiance called "ltview.pl" which is useful for sanity
>> testing your converted ies files in native Radiance. The script is available
>> here:
>> https://github.com/NREL/Radiance/blob/combined/src/util/ltview.pl/
>>
>> ...and it's based on a thing I wrote a while back, which is documented
>> here:
>> http://www.rumblestrip.org/2004/05/10/ltview-a-radiance-utility/
>>
>> The idea was to look at the actual Radiance light source description that
>> gets created by the ies2rad utility, in actual Radiance, so you are truly
>> seeing what you're gonna get in a Radiance simulation. It's helpful for
>> confirming orientation, distribution, and intensity (by running "trace"
>> commands in the rvu window).