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: Point3d[] | IndexedXYZCollection): undefined | Ray3d Parameter Type Description points Point3d[] | IndexedXYZCollection Returns - undefined | Ray3d Defined in geometry3d/PolygonOps.ts Line 354 Last Updated: 12 June, 2024