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Shapemetry API

Shapemetry API / Edge

Class: Edge ​

Defined in: nurbsBrep/topo/Edge.ts:28

A topological edge: a 3D curve bounded by a start and end vertex. The geometric carrier is a Curve adapter from the geom layer; the parameter window is read straight from that curve's natural range.

Three boolean flags carry the same per-edge metadata OCCT's BRep_TEdge stores, so the structural role of an edge is explicit rather than re-derived:

  • degenerate — the edge collapses to a single point (its 3D carrier has no length) yet exists to keep a face's parameter boundary closed. The two pole edges of a sphere are the canonical case: they pin the v = ±π/2 rows of the surface domain to the pole vertex. Distinct from isClosed(), which is also true for a full-circle rim (a closed edge WITH length); a caller that must tell a pole apart from a rim reads this flag, not isClosed().
  • sameParameter — every pcurve of the edge shares the 3D carrier's parametrization, i.e. surface(pcurve(t)) ≈ curve3d(t) at the same t, so a point on the edge can be evaluated through either representation without converting the parameter. Validation lowers it to false when a pcurve drifts from the 3D curve. Mirrors BRep_TEdge::SameParameter.
  • sameRange — every pcurve covers the SAME parameter interval as the 3D carrier (pcurve.range() == curve3d.range()). Mirrors BRep_TEdge::SameRange.

Constructors ​

Constructor ​

new Edge(curve, start, end, tolerance?, degenerate?): Edge

Defined in: nurbsBrep/topo/Edge.ts:38

Parameters ​

curve ​

Curve

start ​

Vertex

end ​

Vertex

tolerance? ​

number = 1e-7

degenerate? ​

boolean = false

Returns ​

Edge

Properties ​

index ​

readonly index: number

Defined in: nurbsBrep/topo/Edge.ts:29

curve ​

curve: Curve

Defined in: nurbsBrep/topo/Edge.ts:30

start ​

start: Vertex

Defined in: nurbsBrep/topo/Edge.ts:31

end ​

end: Vertex

Defined in: nurbsBrep/topo/Edge.ts:32

tolerance ​

tolerance: number

Defined in: nurbsBrep/topo/Edge.ts:33

degenerate ​

degenerate: boolean

Defined in: nurbsBrep/topo/Edge.ts:34

sameParameter ​

sameParameter: boolean

Defined in: nurbsBrep/topo/Edge.ts:35

sameRange ​

sameRange: boolean

Defined in: nurbsBrep/topo/Edge.ts:36

Methods ​

equals() ​

equals(other): boolean

Defined in: nurbsBrep/topo/Edge.ts:58

Identity comparison: two references denote the same edge.

Parameters ​

other ​

Edge

Returns ​

boolean

isClosed() ​

isClosed(): boolean

Defined in: nurbsBrep/topo/Edge.ts:67

True when the two endpoints are the same vertex (a closed loop edge). This holds for BOTH a full-circle rim and a degenerate pole edge — use degenerate to tell those apart.

Returns ​

boolean

parameterRange() ​

parameterRange(): [number, number]

Defined in: nurbsBrep/topo/Edge.ts:72

Parameter interval inherited from the carrier curve.

Returns ​

[number, number]