Jeremy M. Praay nous apporta ses lumieres en ce 2005-02-14 19:05:
> "Jeremy M. Praay" <jer### [at] questsoftwarecom> wrote in message 
> news:4210f96b$1@news.povray.org...
> 
>>"Ross" <rli### [at] everestkcnet> wrote in message 
>>news:4210f67c$1@news.povray.org...
>>
>>>very much so. great texture too. however, what are those artifacts on the
>>>bottom left corner of the lid? they look like they sort of continue all
>>>around the bottom edge of the lid, but are more noticeable on the left 
>>>side.
> 
> 
>>Maybe I need to check my max-gradient or something (though I always 
>>thought that led to black spots).
>>
> 
> 
> Increasing the max_gradient only made more spots appear, which had me 
> puzzled for a bit.  Eventually, I realized that it was creating a ring 
> around the object (like Saturn), and it just so happened that it was right 
> along the bottom, which corresponded to the bottom of the 
> pigment-image_map-heightfield-thing.  Adjusting "contained_by" by an 
> extremely small fraction fixed it.
> 
> I guess it was something similar to a coincident surfaces problem.
> 
I got something similar with a blob with a thressold of 0.

Alain

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