API Reference > geometry-core > Polyface > PolyfaceQuery > boundaryEdges boundaryEdges MethodStatic Test if the facets in source occur in perfectly mated pairs, as is required for a closed manifold volume. If not, extract the boundary edges as lines. boundaryEdges(source: undefined | Polyface | PolyfaceVisitor, includeDanglers: boolean = true, includeMismatch: boolean = true, includeNull: boolean = true): undefined | CurveCollection Parameter Type Description source undefined | Polyface | PolyfaceVisitor includeDanglers boolean includeMismatch boolean includeNull boolean Returns - undefined | CurveCollection Defined in polyface/PolyfaceQuery.ts Line 274 Last Updated: 11 June, 2024