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Tor Olav Kristensen <tor### [at] TOBEREMOVEDgmail com> wrote:
>
> I recommend that you read a little about Rational B-Splines.
>
> --
> Tor Olav
> http://subcube.net
> http://subcube.com
Well, actually i'm not a mathematical genius, sorry, i don't deal with
mathematics at all ;). I'm chemist and mathematics was always a riddle for
me. But there should be a way to define a nearly perfect circle using a
cubic B-spline and putting the start and end controllpoint somewhere far
away. but it did not worked. I tried a lot to shift the control points, but
no way :((
Here the spline and the pic.
#declare C_Path4 = spline { natural_spline
-0.25 < -26.666, 0, 0>,
0.00, < 0, 0, 20>,
0.25, < 20, 0, 0>,
0.50, < 0, 0,-20>,
0.75, < -20, 0, 0>,
1.00, < 0, 0, 20>,
1.25, < 26.666, 0, 0>};
Maybe i'm totally wrong and a circle can't be declare by a spline
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