API Reference > geometry-core > Polyface > PolyfaceBuilder > addTriangleFacet addTriangleFacet Method Add a triangle to the polyface given its points in order around the edges. Optionally provide params and triangle normals, otherwise they will be calculated without reference data. addTriangleFacet(points: Point3d[] | GrowableXYZArray, params?: Point2d[], normals?: Vector3d[]): void Parameter Type Description points Point3d[] | GrowableXYZArray params Point2d[] normals Vector3d[] Returns - void Defined in core/geometry/src/polyface/PolyfaceBuilder.ts Line 647 Last Updated: 13 June, 2024