ies photometry+geometry?

I am trying to include in a scene file, lamp fixture photometry with a object geometry (dxf model supplied by the manufacturer for that same fixture. Is there a straighforward way of combining both such that the fixture model doesn’t compromise the photometry??

regards

Steve

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steve michel wrote:

I am trying to include in a scene file, lamp fixture photometry with a object geometry (dxf model supplied by the manufacturer for that same fixture. Is there a straighforward way of combining both such that the fixture model doesn't compromise the photometry??

You need to use a procedure where you wrap your geometry with an illum sphere or box and you apply the luminous distribution to that illum enclosure. Then you also have to generally create some glow polygons within the fixture geometry to make the geometry appear correct (the glow will not be evaluated beyond the illum boundary so you won't affect the distribution of the fixture on the scene). I would say it's not straightforward, but the procedure is outlined in Charles Ehrlich's chapter of Rendering with Radiance. The process is very much streamlined when you use Georg Mischler's Rayfront interface. Personally, I am usually interested in the calculation result from electric light sources, so I tend to just use the simple geometry that ies2rad creates for me. But the visual result of going the distance and actually setting up the whole illum enclosure can be fantastic. I have very limited experience with this, but I hope others will chime in here with some tips.

- Rob Guglielmetti