Hi Pilou, also consider that in order to remove the edges between pieces it is necessary to form just one single surface out of the different surfaces that you currently have.

That's difficult to do automatically in cases where the different surfaces have different control point structures in them or meet only at internal trim edges instead of only meeting at edges of the underlying surfaces.

Planes are a special case where it's easier for the code to know that 2 planes that touch each other and have the same plane normal can be represented ok by just one single larger plane. For other kinds of surfaces it is more difficult to construct code that would be able to analyze the surfaces to determine that.

- Michael