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).
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Preview of image 'lum.jpg'