A scene with 1000 randomly placed light sources with distance-dependent 
attenuation (fade_power, fade_distance).

First image: POV-Ray 3.7, render time 73s.

Second image: experimental patch, render time 9s.

For each light source, the patch automatically computes a cutoff 
distance based on light source brightness, fade parameters, and a global 
threshold (currently this is the global adc_bailout setting). Beyond 
this distance, the lights source is simply ignored.

(As an alternative, the patch also allows for manually specifying the 
cutoff distance, but that's not used in this scene.)

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Download 'fade_light_pov37.png' (293 KB) Download 'fade_light_upov.png' (281 KB)

Preview of image 'fade_light_pov37.png'

Preview of image 'fade_light_upov.png'