Create a surface out of a network of curves.

Input parameters:

1. Cu → Curves in the U direction of the network.
2. Cv → Curves in the V direction of the network. If left blank, all the curves in the U input will be automatically divided into U and V curves.
3. Ct → Continuity of surface at network boundaries.
   • 0 → Loose
   • 1 → Position
   • 2 → Tangency
   • 3 → Curvature

Output parameters:

1. Sf → Surface constructed out of the curve network.