I used the SDL raytracer found in the help file
(http://www.povray.org/documentation/view/3.6.1/123/) to refine an idea
more or less suggested by Bruno Cabasson.
Top picture skips a ray if (square of) distance in colour-space is smaller
than an user supplied threshold.
Middle pic is the result of the unadulterated SDL raytracer.
Bottom pic is the difference of the two.
The supplied Skip-a-ray pic requires about 65-70% of the time to render.

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