Converting a freeform line into a LOFTED 3d geometry during RUNTIME

How do you convert a freeform line, drawn in 2d, into a 3d mesh somewhat like a loft geometry based on the path of the freeform line, but with custom cross-section (chosen prior, and based on another 2d closed-line-shape) ... during runtime! ;-)

There is now an asset on the asset store that does exactly this and a lot more as well, MegaShapes « MegaFiers it offers simple and complex lofts as well as the ability to clone objects onto the newly created loft surface.

You can't in Unity. But you can in just about all 3D modeling applications. Start with 3ds Max.

Here's an excellent tutorial on making a wine glass. And we all LOVE wine... right?