"Peter Popov" <pet### [at] vipbg> wrote in message
news:2d0brtk13k51jdgk4h98hajm1d5gh0db4g@4ax.com...
> On Fri, 28 Sep 2001 14:01:09 +0100, "Duncan Adamson"
> <dja### [at] docicacuk> wrote:
>
> >Hang a rope from two points <0,1,0> and <1,1,0>
> >The shape it makes is a caterary
>
> Isn't it a parabola?

Nope. IIRC a caterary is almost parallel at the start and end points.

- Nekar

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in news:2d0brtk13k51jdgk4h98hajm1d5gh0db4g@4ax.com Peter Popov wrote:

>>The shape it makes is a caterary
> 
> Isn't it a parabola?
> 
> 

http://www-groups.dcs.st-and.ac.uk/~history/Curves/Catenary.html

Ingo

-- 
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Peter Popov wrote:
> 
> On Fri, 28 Sep 2001 14:01:09 +0100, "Duncan Adamson"
> <dja### [at] docicacuk> wrote:
> 
> >Hang a rope from two points <0,1,0> and <1,1,0>
> >The shape it makes is a caterary
> 
> Isn't it a parabola?

IIRC, actually, the curve you get when you roll a parabola along an axis
and trace the focus.  Very similar to a parabola but not a parabola.

-- 
David Fontaine  <dav### [at] faricynet>  ICQ 55354965
My raytracing gallery:  http://davidf.faricy.net/

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