http://mathworld.wolfram.com/CubicSpline.html


This might help shed some light on the method, in case anyone cares to elaborate
on Catmull-Rom splines.  (AND I'm really not all that great [read: suck] at
doing matrix math)
http://news.povray.org/povray.general/message/%3C34EA8144.4D7A8113%40dhol.com%3E/#%3C34EA8144.4D7A8113%40dhol.com%3E

http://en.wikiversity.org/wiki/Cubic_Spline_Interpolation

and a spreadsheet found by searching

      cubic spline excel spreadsheet

https://newtonexcelbach.wordpress.com/2012/10/08/daily-download-22-splines-and-curves/

I've not quite finished with Coffee #1, so it will take some time to wrap my
grey(ing) matter around all the pretty symbols...  :)

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