Apologies, O Great One, but I still get error messages, even after I figured
that I needed to add code to define

        #declare Points[nnn]=Ptemp[nnn];

Could you just post the whole working kaboodle at p.b.s-f?

Jerry Anning wrote:

> On Mon, 14 Aug 2000 09:04:51 -0400, "Greg M. Johnson"
> <gre### [at] my-dejanewscom> wrote:
>
> >I get an error message for subscript out of range when it hits the code:
> >
> > + Horn(3, Points[Pf + 2])
>
> This shows the perils of cut-and-pasting parts of messy one-off code.
> replace the part at the beginning where you set up the Points array
> with this:
>
> #declare Dim = 6;  // this means an array of 6 control points
>
> #declare Ptemp = array[Dim]
>  { <.1, .5, .9>, <.8, 2, 3> ...} // temp for the control points
>
> #declare Points = array[Dim + 2] // will be actual working points
>
> #declare Points[0] = Ptemp[Dim - 1]; // this and following line
> // allow for first and last points properly
>
> #declare Points[Dim + 1] = Ptemp[0];
>
> Discussion:  in most spline types, including these, the first and last
> control points are not part of the final curve.  This fixes things so
> that *all* of the control points (corners) you provide are part of the
> curve and you get the endpoints you expect.  I left this out earlier
> because I stupidly confused it with part of the closure code that I
> removed.
>
> Jerry Anning
> clem "at" dhol "dot" org

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