API Reference > geometry-core > Polyface > PolyfaceBuilder > addTriangleFan addTriangleFan Method Add triangles from points[0] to each far edge. addTriangleFan(conePoint: Point3d, ls: LineString3d, toggle: boolean): void Parameter Type Description conePoint Point3d ls LineString3d linestring with point coordinates toggle boolean if true, wrap the triangle creation in toggleReversedFacetFlag. Returns - void Defined in core/geometry/src/polyface/PolyfaceBuilder.ts Line 292 Last Updated: 13 June, 2024