E = edges (S) returns the indices of the edges of S as a row vector, in the order solid.Shape.numedges counts them. Seam edges, where a curved face closes on itself, and the degenerate edges at the poles of a sphere are left out: they bound faces without being features of the part, and nothing can be done to them.

The indices belong to S alone. Every operation that makes a new shape numbers its edges afresh, so choose edges from the shape the feature is applied to, immediately before applying it.

Name/Value pairs narrow the choice, and an edge is returned only when it meets all of them:

'Type'

The kind of curve the edge lies on: 'line', 'circle', 'ellipse', 'bspline' or 'other', or a cell array of several.

'Direction'

A nonzero 3-element vector. A straight edge is chosen when it runs parallel to it, either way; a circle or an ellipse when its axis does. Other edges have no direction and are never chosen.

'Within'

A box [xmin, ymin, zmin, xmax, ymax, zmax], as solid.Shape.bbox returns one. An edge is chosen when it lies wholly inside, to within 1e-6 millimetres.

'Face'

Face indices, as solid.Shape.faces returns them. An edge is chosen when it bounds any of these faces, so all the edges round a face can be rounded or chamfered in one step: fillet (S, edges (S, 'Face', F), R).

 B = solid.box (10, 20, 30);
 E = edges (B, 'Direction', [0, 0, 1]);    # the four upright edges
 B = fillet (B, E, 2);

The empty shape has no edges.

See also: solid.Shape.faces, solid.Shape.fillet, solid.Shape.chamfer

Source Code: solid.Shape