> when I edit the dimensions of those selected points as you can see it in the screenshots.
> I edit the size of the selected points and the consequence is that MoI change the selection
> from top points to bottom points as if it lose its selection and redo another selection with
> some other points.

Hi Phiro, yes on that object when the surface control points are edited a sharp edge is introduced and the face is split up into multiple faces.

The surface control point editing code does not do a good job of handling the difference in face count and control point structure with the crease being introduced, as you point out.

I would recommend to not edit surface control points in this case. It's going to have pretty weird behavior of a sharp edge introduced into the surface even if the control point selection bug wasn't there.

If you create a surface of revolution using the revolve command, it will behave better with control point editing.

Or also if you run Rebuild on the profile curve before sweeping it that will also make a more control point squishing friendly surface.

- Michael