API Reference > geometry-core > Polyface > PolyfaceData > isValidFacetStartIndexArray isValidFacetStartIndexArray MethodStatic Test if facetStartIndex is (minimally!) valid: length must be nonzero (recall that for "no facets" the facetStartIndexArray still must contain a 0) Each entry must be strictly smaller than the one that follows. isValidFacetStartIndexArray(facetStartIndex: number[]): boolean Parameter Type Description facetStartIndex number[] array of facetStart data. facet i has indices at facetsStartIndex[i] to (one before) facetStartIndex[i+1] Returns - boolean Defined in core/geometry/src/polyface/PolyfaceData.ts Line 390 Last Updated: 13 June, 2024