The above is a curved surface that I modeled by dragging the middle control points up. I have tried using many other methods e.g. RailRevolve, NetworkSrf etc as one whole surface or broken up surfaces joined together and it keeps giving me a surface with very subtle “X” shapes pinches from the center to the corners. Nothing could give me the same smooth results as dragging the control points of the surface.
The thickness from the border of the surface to the tangent or the tip of the curved surface needs to be of a specific value. By dragging control points, I can only eyeball it. Is there a more precise way of modelling this surface where I can control all the parameters?
Edit: The border has to be flat/planar.