Wasn't it Kurts who wrote:
>thanks you. i follow yours advices. some progress but still one problem.

There's a typo in your spline co-ordinates. 
Cubic splines don't like it if you have repeat control points. 
You typed:

#declare MySplinePoints[1] =< 0, 2, 0>;
#declare MySplinePoints[2] =< 0, 2, 0>;

Instead of

#declare MySplinePoints[1] =< 0, 2, 0>;
#declare MySplinePoints[2] =< 2, 2, 0>;

-- 
Mike Williams
Gentleman of Leisure

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