How to delete the point?

You can't delete just a single point from the middle of a NURBS surface. NURBS surfaces are made out of regular rows and columns. Each row has the same number of points and each column has the same number of points, making a grid type structure. You can't delete just one single point you have to delete an entire row or entire column. You also can't insert just one single individual point you can only insert a new column or a new row of points. It's always structured in columns and rows.

That's what Sub-d modeling is for, with sub-d modeling you don't have to have regular rows and columns, you can add in a single point in one spot and connect it with polygons to surrounding ones.

For repairing something like you show there I would probably extract the boundary curves, delete the surface and remake it using the boundary curves.

- Michael

I know about single point. Rhino allows you to delete rows or columns. How to delete the same in moi?

https://imgur.com/2GrW1lS

can you post the 3dm file ?

no easy to see on the screencapture

Hi Quaritexa,

re:
> I know about single point. Rhino allows you to delete rows or columns.
> How to delete the same in moi?

MoI does not currently have a method for deleting rows or columns of surface control points. That's something that is very rarely, if ever, used. Deleting points like that will alter the shape of the surface often in strange ways if it has a non-uniform knot vector.

To repair something like your example there it's better to reconstruct it.

In general surface control point manipulation is not a focus area for MoI, because of the NURBS surface row/column organization of surfaces. If you want to work on something by modifying surface control points you are better off doing that in a sub-d modeling program.

- Michael

Ok. Thanks, Michael.