In article <web.4fe78a498a20243758ec92320@news.povray.org>,
 "StephenS" <nomail@nomail> wrote:

>function {
>  sqrt(pow(x*cos(a*y)-z*sin(a*y),2)+pow(x*sin(a*y)+z*cos(a*y),2))-
>  Groove(x*cos(a*y) - z*sin(a*y),x*sin(a*y) + z*cos(a*y))
>  }

thanks, it's work.

-- 
klp

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