API Reference > geometry-core > Polyface > IndexedPolyface > _facetStart _facetStart Protected _facetStart: number[] index to the index array entries for a specific facet. the facet count is facetStart.length - 1 facet [f] indices run from facetStart[f] to upper limit facetStart[f+1]. Note the array is initialized with one entry. Defined in core/geometry/src/polyface/Polyface.ts Line 142 Last Updated: 13 June, 2024