Create a surface from four corner points and a bulge point.

Input parameters:

1. C1 → First corner of surface.
2. C2 → Second corner of surface.
3. C3 → Third corner of surface.
4. C4 → Fourth corner of surface.
5. Bp → Bulge point on surface interior.
6. Mt → Surface construction method.
   • 0 → Natural
   • 1 → Arched

Output parameters:

1. Sf → Surface from corner and bulge points.