Okay, I've got a vector math question for those of you who are good with
that kinda stuff.....

Here's the setup. Imagine a spline describing a 3D curve with undulations,
rather like, say, a roller coaster track. (Indeed, that is exactly what I
intend to do with it.) I want to be able to translate a point relative to
the origin 'along' the spline, so that basically the Z-axis at the origin
would point along the tangent of the spine at the point. Now the tricky
part. I want to *twist* the spline, with a another 1d spline that
represents the twist in degrees at any given point.

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