"Le_Forgeron" <jgr### [at] freefr> schreef in bericht 
news:4a707f48$1@news.povray.org...
> It's a conocuneus, a quartic.
> Toothpath tube classical end.
>
> intersection {
> box {<0,-1,-1><2,1,1>}
> quartic {
>  <0,0,0,0,0, 0,0,1,0,-1,
>   0,0,0,0,0, 0,0,0,0,0,
>   0,0,0,0,0, 4,0,0,0,0,
>   0,0,0,0,0> }
> }

This is now the most elegant solution. Thanks a lot!

Thomas

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