when revolve a curve to get a surface there is an extra segment on the surface ,
Is there any way to get a surface without any segment when revolve?
Hi - if you mean the visible seam in that picture, a NURBS surface is always 4-sided. This seam is simply 2 of the edges that are joining in the same place. You can’t avoid getting those but, when baked to the Rhino document, you can use display properties to turn them off and make them invisible.