3D Modeling in AutoCAD with Loft
With the LOFT command, you can create a new solid or surface by specifying a series of cross sections. The cross sections define the profile (shape) of the resulting solid or surface. It is recommend to use or "Path", because it's easier to apply than "Guides". Use cross sections with arcs, polylines, lines or polygons. If you use closed polylines or circles as cross sections, then LOFT creates a solid in the space between the cross sections. You must specify at least two cross sections when you use the LOFT command. Use multiple arcs, splines, polylines or lines, if you like to create a open surface. Later, if you want to convert a 3D solid to a surface, then use the explode command. The LOFT command is great for 3D modeling of landscapes or other complex shapes. I used it for a ship hull.
First you create 3 splines, next you select them as cross-sections in order from A to C