[PD] waveshaper with spline curves

[Mathieu Bouchard]

On Fri, 26 May 2006, thewade wrote:

> I built a simple wave shaper - its real easy - but making non uniform
> ration b-splines (or any other type of b-spline) would be difficult to
> implement in PD well unless you know C.

There exists an equivalence between b-splines and béziers. Use this 
matrix:

[1 4 1 0;
 0 4 2 0;
 0 2 4 0;
 0 1 4 1] / 6

it can convert b-spline points to bézier points of the same curve... or 
maybe it does the other way around.

i took the matrix from "Interactive Computer Graphics" by Edward Angel.

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| Mathieu Bouchard - tél:+1.514.383.3801 - http://artengine.ca/matju
| Freelance Digital Arts Engineer, Montréal QC Canada