I'm not sure ... why do we need to add points ?
Correct me if i'm wrong:
If we speak about deformers all we need is change "parameter" or position of control points.
And since we can move control points by hand there is no way we can't make it by deformer.
Smooth, inflate, pinch etc deformers doesn't add or decrease number of surface control points.

I don't know much about NURBS internal structure but in poly modeling this operations cost pretty much.
So it's maybe not a good idea to implement it as real time interactive tool.
But even XSI approach for deformers (when we have a deformer and separated universal brush tool that only apply parameter value to control points with falloff or brush radius) may be helpfull.

Here is a short video on how it implemented in XSI.


> Hi Bravlin, you posted this in the node editor thread, I have moved it into it's own thread here since it's not related to the node editor.
It was the Mr.PILOU advice in modelling thread, when i ask about smooth deformers here