Loft is a method to create complicated smooth 3D shapes in CAD and other 3D modeling software.
Planar cross-sections of the desired shape are defined at chosen locations.
Designers can modify the shape through choice of fitting algorithm and input parameters.
The method is used in packages such as Onshape, 3D Studio Max, Creo*, SolidWorks, NX, Autodesk Revit, and FreeCAD.
The final shape is produced by placing planks over the ribs to form a smooth skin.