Render the example scene below, with the new UVPov. You should see darker
patches behind the two objects. Here are a few observations:
1) It only appears when antialiasing is on, and only during the final pass.
Probably some calculation is omitted with sub-pixel rays.
2) Very high quality (many rays, low error_bound) will eliminate (or obscure?)
the dark patches, but other freaky things occur (see for yourself). Maybe
related, maybe not.

I'm wondering if this has something to do with the non-constant
distance_maximum, since the problem seems to occur on a flat background around
outstanding objects... I may be wrong, though.

Margus

//BEGIN SCENE

global_settings{
    ini_option "+qr"
    ini_option "Preview_Start_Size=4"
    ini_option "Preview_End_Size=2"
    radiosity{
        brightness 2
        count 100 //try 1200
        error_bound 1 //try 0.05
        gray_threshold 0
        low_error_factor .5 //try 0.1
        minimum_reuse 0.015
        nearest_count 5
        recursion_limit 2
        max_sample 10
        adc_bailout .01/10
    }
}

camera{location <-1,2,-4> look_at <-2.5,2,-1> angle 90}

plane{z,4
    pigment{rgb <.7,.7,.65>}
    finish{ambient 0 diffuse .6}
    hollow
}

sphere{<-3,2,3>,.5 pigment{rgb 1} finish{ambient 10 diffuse 0}}

cylinder{-y,y,.2 pigment{rgb 1} finish{ambient 10} translate z*3+y*2}

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