[PD] cubic spline interpolation

[Mathieu Bouchard]

On Thu, 2 Mar 2006, Robert Scott wrote:

> Have you looked at tabread4~ ? From its description as a '4 point
> interpolation', I've always assumed it to be a cubic bezier spline.

It's a cubic but not a Bézier: a Bézier would use 2 points plus the
derivatives at those points. To identify a cubic you always need to get 4
values but they don't have to be points. When all you have is points and 
not derivatives, the best you can do is get 4 points and do some kind of 
non-Bézier cubic with it. Conversely, when you have 4 points you can 
always build a cubic with it.

 _ _ __ ___ _____ ________ _____________ _____________________ ...
| Mathieu Bouchard - tél:+1.514.383.3801 - http://artengine.ca/matju
| Freelance Digital Arts Engineer, Montréal QC Canada