"Warp" <war### [at] tagpovrayorg> wrote in message
news:3a784b4c@news.povray.org...
>   The FindKnee() macro in the Thoroughly Useful Macros does exactly what
you
> want:
>
> http://enphilistor.users4.50megs.com/macs.htm


Thanks Warp, now all I gotta do is work out how to use it!

Mick

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