API Reference > geometry-core > CartesianGeometry > PolygonOps > centroidAreaNormal centroidAreaNormal MethodStatic Return a Ray3d with (assuming the polygon is planar and not self-intersecting) origin at the centroid of the (3D) polygon normal is a unit vector perpendicular to the plane 'a' member is the area. centroidAreaNormal(points: IndexedXYZCollection | Point3d[]): Ray3d | undefined Parameter Type Description points IndexedXYZCollection | Point3d[] Returns - Ray3d | undefined Defined in core/geometry/src/geometry3d/PolygonOps.ts Line 353 Last Updated: 13 June, 2024