Optionalshape: TOptionaltangentAngle: numberOptionalindexes: number[]The shape whose edges are chosen from.
OptionaltangentHow far in degrees, up to a right angle, two faces may turn at an edge and still count as smooth, neither convex nor concave.
OptionalindexesThe edges to choose among, counted from 0 as shapes.edge.getEdges lists them; left out, all
are candidates, and an empty list chooses none.
A shape and an angle for
select.edges.convexandselect.edges.concave.