> I don't think you need the atan(z/x)*radius, you can just use
>
> function { F(sqrt(x*x+z*z)-r1, y, z) }
>
> See <http://www.econym.demon.co.uk/isotut/substitute.htm#sor>
>
>
> --
> Mike Williams
> Gentleman of Leisure

I tried it without replacing x (in my case) and it worked. --> less render
time. Thanks very much

I also rendered the bended (with splines) 2D-star, but it was very slow.

Do you know anything about a bug when you are using macros with more than 7
parameters? I have big trouble with this.

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