Toothpaste tube end indeed covers the bill  :-)

Thomas


"Le_Forgeron" <jgr### [at] freefr> schreef in bericht 
news:4a707f48$1@news.povray.org...
> Further thinking about your description, if apex really a segment parallel 
> to base:
>
> check volume 3 of news://news.povray.org:119/496f790c@news.povray.org
> (title: "6 volumes" OP: Le_Forgeron, Date 15 january 2009)
>
> 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> }
> }

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