Sorry, I sent it so fast by accident... I wanted to write this:

> Not elegant, I know, but it works for me (I had the same problem here 
>recently). One more point at each end works even better...
>
> #declare Spline =
> spline {
>    cubic_spline
>    -5, < 0,0,0>, // P3
>    -4, < 1,0,0>, // P4
>    -3, < 2,0,2>, // P5
>    -2, <-2,0,2>, // P1
>    -1, <-1,0,0>, // P2
>     0, < 0,0,0>, // P3 red joining point
>     1, < 1,0,0>, // P4
>     2, < 2,0,2>, // P5
>     8, <-2,0,2>, // P1
>     9, <-1,0,0>, // P2
>    10, < 0,0,0>, // P3 red joining point
>    11, < 1,0,0>, // P4
>    12, < 2,0,2>, // P5
>    13, <-2,0,2>, // P1
>    14, <-1,0,0>, // P2
>    15, < 0,0,0>, // P3
> }
> 

-- 
Jaime Vives Piqueres

La Persistencia de la Ignorancia
http://www.ignorancia.org

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