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: Polyface | undefined, includeDanglers: boolean = true, includeMismatch: boolean = true, includeNull: boolean = true): CurveCollection | undefined Parameter Type Description source Polyface | undefined includeDanglers boolean includeMismatch boolean includeNull boolean Returns - CurveCollection | undefined Defined in core/geometry/src/polyface/PolyfaceQuery.ts Line 279 Last Updated: 13 June, 2024