POV-Ray : Newsgroups : povray.binaries.images : Having a try at light distributions : Re: Having a try at light distributions Server Time: 17 Jun 2019 06:36:10 GMT
  Re: Having a try at light distributions  
From: Norbert Kern
Date: 13 May 2019 18:00:06
"Jasper" <nomail@nomail> wrote:
> Hello everyone!
>
> I am trying to introduce photometric data files of luminaires (i.e. IESNA .ies
> or EULUMDAT .ldt) in Povray to get "correct" lighting distributions. This
> currently works by combining
>
> (1) a point light source
> (2) a sphere with radius 0.01 and spherical mapping of an image map (.png with
> the alpha channel used for transparency) which represents the lighting
> distribution for different angles.
>
> However, for large coordinates (e.g. 1e+6), I get unwanted black spots in a
> regular pattern (see attached image on the left).
>
> Jasper


OK, this doesn't have anything to do with radiosity - so I agree on floating
point precision issues as cause...

Norbert


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