> Hi Alain
>
> Thanks for the solution you sketched. In principle, I am not afraid of extensive
> trigonometry. However, this will mean that I am doing something that is very
> simple in standard splines in a very elaborate way. My spline will indeed curve
> substantially and, what's more, I will repeat the spline in a number of
> geometries. If I follow your advice, I'll need to make it good enough to work in
> general cases.
>
> I was hoping that the spline package offers a one-line way to do this, and that
> I simply missed the syntax. For instance, there is a spline clock term in the
> package ("sClock"), but when I try utlilyzing it in the pigment definition, the
> term is not accepted. Can it be that I have not understood how term has to be
> defined?
>
> Best regards,
> Alex
>
>

Usualy, any variable containing "clock", with any form of 
capitalisation, refer to the clock built in variable and is related to 
animations.
Most of the case, you'll find something like:
#declare sClock = clock*Something;
or
#declare sClock = clock*Something+SomethingElse;

It can also be set to some user defined value. When used with splines, 
it's usualy used to pick a specific point along the spline.

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