Hi unclecharlie,

> I don't know if it is the same source code but these
> curves look like Bezier curves in Blender.

No, they're not really the same - if you look closely you should notice some differences between how Spiro curves work and how Bezier curves in Blender work. Specifically Spiro curves are controlled by a set of points on the curve and don't have those tangent handle things that the old-style Bezier curve editing has.

- Michael