Wasn't it Rafal 'Raf256' Maj who wrote:
>ral### [at] abookscom news:web.42101b4cd84304fa5a9431fb0@news.povray.org
>
>> 
>> OOPS! ... glad I caught the misspelling!!! ;-)
>
>Lol, You also used hearth iso-function? Someone realy should came up with 
>nicer/better/other versions since it's quite old now ;)
>
>(also this funcion has damn "bug" - accuarycy setting must be very high, 
>otherwise there will be non-continuity horizontl line in the middle)

I invented this heart (and heart hoop) quite a while ago.
<http://www.econym.demon.co.uk/isotut/real.htm#hearthoop>
It's faster than f_heart and doesn't have the line in the middle.

-- 
Mike Williams
Gentleman of Leisure

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