Fillet sharp edges in a surface.

Input parameters:

1. Sf → Surface whose edges to fillet.
2. Ed → Edge indices to fillet.
3. Rd → Fillet radius.
4. Ty → Fillet type.
   • 0 → Edge Distance
   • 1 → Rolling Ball
   • 2 → Rail Distance
5. Sb → Set back fillet corners.

Output parameters:

1. Sf → Surface with filleted edges.