To get the tangent at some point A on your spline, get the value of the
spline at A and some other point B which is very close to A. The values
you get we call spline(A) & spline(B).
The vector T=spline(B)-spline(A) gives the direction at the point A if B
is very close to A on the spline (check vlength(T) to find out how close
they are)
Don't forget to translate your object to spline(A) after aligning it
along T, since T is only a direction.
--
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"Grey Knight" contact{ email "gre### [at] yahoo com" }
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