Am 04.08.2014 13:31, schrieb James Holsenback:
> On 08/04/2014 06:57 AM, clipka wrote:
>> 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.
>>
>
> Hmmm ... ok then just for sake of discussion here's how
>
> #include "rad_def.inc"
> Rad_Settings(Radiosity_Fast, off, off)
>
> handles things

... because it happens to utterly miscompute it.

Use more pretrace steps and a lower error_bound for starters.

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