API Reference > geometry-core > CartesianGeometry > Ellipsoid > radiansToUnitNormalRay radiansToUnitNormalRay Method Evaluate a point and unit normal at given angles. radiansToUnitNormalRay(thetaRadians: number, phiRadians: number, result?: Ray3d): undefined | Ray3d Parameter Type Description thetaRadians number longitude, in radians phiRadians number latitude, in radians result Ray3d optional transform result Returns - undefined | Ray3d Defined in geometry3d/Ellipsoid.ts Line 627 Last Updated: 11 June, 2024