S = fillet (S, E, R) rounds the edges of S indexed by E, as solid.Shape.edges returns them, to the radius R millimetres. An outside edge loses material and an inside edge gains it, as a fillet on a casting or a radius left by a cutter does. Where rounded edges meet at a corner the corner is blended.

An edge is rounded together with every edge that runs on from it smoothly, tangent where they meet, as Open CASCADE rounds a chain. On a box whose upright edges are already rounded, choosing one top edge rounds the whole top rim.

A radius too large for the faces beside an edge cannot be built and raises an error, as does an edge that cannot be rounded at all.

 ## A block with its four upright edges rounded to 5
 S = solid.box (40, 30, 10);
 S = fillet (S, edges (S, 'Direction', [0, 0, 1]), 5);
 numfaces (S)
 ⇒ 10

See also: solid.Shape.edges, solid.Shape.chamfer

Source Code: solid.Shape