Le 2023-03-15 à 03:30, ingo a écrit :
> "ingo" <nomail@nomail> wrote:
> 
> 
> 
I see the problem. Your spline is not «stiff» enough.
Try pushing the control points back. That'll make the spline flatter at 
the placement points.

Try this :
#declare vC = array[13]{
    <1.500000, 0.000000, 0>,//P
    <1.500000, 0.6, 0>,//C
    <0.47, 1.000000, 0>,//C
    <0.000000, 1.000000, 0>,//P
    <-0.47, 1.000000, 0>,//C
    <-1.500000, 0.6, 0>,//C
    <-1.500000, 0.000000, 0>,//P
    <-1.500000, -0.6, 0>,//C
    <-0.47, -1.000000, 0>,//C
    <0.000000, -1.000000, 0>,//P
    <0.47, -1.000000, 0>,//C
    <1.500000, -0.6, 0>,//C
    <1.500000, 0.000000, 0>//P
}

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