Chamfer sharp edges in a surface.

Input parameters:

1. Sf → Surface whose edges to chamfer.
2. Ed → Edge indices to chamfer.
3. Ch → Chamfer size.
4. Ty → Fillet type.
   • 0 → Edge Distance
   • 1 → Rolling Ball
   • 2 → Rail Distance

Output parameters:

1. Sf → Surface with chamfered edges.