Am 04.08.2014 12:04, schrieb James Holsenback:
> On 07/23/2014 07:27 PM, clipka wrote:
>> I'm currently implementing a new UberPOV feature that allows bypassing
>> the caching of radiosity samples, effectively resulting in purely
>> stochastic unbiased Global Illumination computation. (See recent
>> discussion on povray.unofficial.patches.)
>
> here's the image that prompted my parameter question in p.u.patches ...
> the alcove is made of box primitives and has cylinders to round the
> insides of the corners, used merge not union.

I think what you're seeing is not an artifact at all.

A surface like the floor typically gets darker near other surfaces such 
as the wall; but the strength of this effect depends on the wall's 
brightness. A very bright wall - whether just due to its colour or also 
due to the angle of illumination - may cause the floor nearby to even 
become /brighter/ than elsewhere, while a very dark wall - whether just 
due to its colour, angle of illumination or shadows - will cause the 
nearby floor to become /extremely/ dark.

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