[Radiance-general] IES files and MGF geometry

[Guglielmetti, Robert]

Ah, I "see". So you have this thing that throws down a great deal, so a
lot of the candelas toward nadir are being mapped to that bottom ring in
the ies2rad translation. My sense is that for the best result you'd want
to use the illum sphere with a large-ish radius ‹ large enough so that the
output gets mapped to points on the sphere that would fall outside the
supporting post impostor geometry, but small enough that the sphere is
high enough off the ground that the projected light looks "right".
Obviously for critical illuminance calcs you could do one run with just
the emitters (which seem to have been used in the images on the
manufacturer's website), and then for visualization you could use the
illum sphere trick, or get fancy with lboxcorr...

On 11/5/14, 8:14 AM, "Christopher Rush" <Christopher.Rush at arup.com> wrote:

>Do I understand that the problem is not generating geometry much taller
>than the actual lens, but rather that that it generates a cylinder with
>top and bottom circles, while only the shell of the cylinder is the
>actual light emitter? I had started to reply regarding adjusting the
>height in the IES file, but maybe someone else knows a solution for the
>top/bottom surface problem - which would be good to know.
>
>-----Original Message-----
>
>The product I'm looking at is this:
>http://products.iguzzini.com/iway_round
>which is why I want to get rid of the top and bottom bits of the
>ies2rad geometry.
>
>What I was hoping to be able to do with MGF is tell it what the
>fitting looks like.  In this particular case, I'd model 3 stacked
>cylinders, enclosed with a disk at the top. Only the middle cylinder
>would act as an emitter.  Does that make sense?
>
>Best
>Axel
>____________________________________________________________
>Electronic mail messages entering and leaving Arup  business
>systems are scanned for acceptability of content and viruses
>
>
>_______________________________________________
>Radiance-general mailing list
>Radiance-general at radiance-online.org
>http://www.radiance-online.org/mailman/listinfo/radiance-general