Create a SubD surface from a set of lofting curves.

Input parameters:

1. Sc → Sequence of loft section curves.
2. Cl → Close the SubD surface.
3. Cn → Add sharp corners to the SubD surface.
4. Cr → Add sharp creases to the SubD surface.
5. Dv → Number of SubD divisions between sections.

Output parameters:

1. Sd → Subdivision surface based on loft.