API Reference > geometry-core > Polyface > PolyfaceQuery > collectDuplicateFacetIndices collectDuplicateFacetIndices MethodStatic Return an array of arrays describing facet duplication. collectDuplicateFacetIndices(polyface: Polyface, includeSingletons: boolean = false): number[][] Parameter Type Description polyface Polyface includeSingletons boolean if true, non-duplicated facets are included in the output.* Each array entry in the output contains read indices of a cluster of facets with the same vertex indices. Returns - number[][] Defined in core/geometry/src/polyface/PolyfaceQuery.ts Line 659 Last Updated: 13 June, 2024