On 2017-04-29 08:05 PM (-4), Jörg "Yadgar" Bleimann wrote:
> Hi(gh)!
>
> I started to model the building blocks of a Swiss-made marble lane
> system... when I came to an elongated block with a serpentine-shaped
> marble track on top, I chose to use a cubic sphere to create the
> hollow... but it resulted in heavy artifacts (object on the extreme
> right of the scene attached). I tried various tolerance values - but
> nothing removed those artifacts! Here is the code:

It is for just such a reason that I created the SphereSweep module in 
the Object Collection:

http://lib.povray.org/searchcollection/index2.php?objectName=SphereSweep&contributorTag=Cousin%20Ricky

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