Hi Pilou,

> Is this sort of tools who is use in Rhino (as hidden tool) for the
> bender or deformations functions?

It adds a different kind of object to Rhino - a "T-Spline" object which behaves sort of like a cross between subdivision surfaces and NURBS.

It lets you do some work more in the style of a polygon modeling program, but also get the final output in NURBS form.

- Michael