I want to convert a non-rectangular surface to either a Nurbs surface or Tspline surface. I need to do this in order to manipulate the vertices to create a bulge shape for example. However, nurbs surfaces need to be square or rectangular. Is there another way to create Nurbs of Tspline surfaces with non rectangular surfaces?
Current surface to be converted to either nurbs surface or Tspline surface
desired shape but surface is transformed to a square shape and only then points can be translated and converted to nurbs surface