API Reference > geometry-core > CartesianGeometry > Ellipsoid > radiansToPointAnd2Derivatives radiansToPointAnd2Derivatives Method Evaluate a point and derivatives wrt to theta, phi, thetaTheta, phiPhi, and thetaPhi. All outputs are to caller-allocated points and vectors. radiansToPointAnd2Derivatives(thetaRadians: number, phiRadians: number, point: Point3d, d1Theta: Vector3d, d1Phi: Vector3d, d2ThetaTheta: Vector3d, d2PhiPhi: Vector3d, d2ThetaPhi: Vector3d): void Parameter Type Description thetaRadians number longitude, in radians phiRadians number latitude, in radians point Point3d (returned) surface point d1Theta Vector3d (returned) derivative wrt theta d1Phi Vector3d (returned) derivative wrt phi d2ThetaTheta Vector3d (returned) second derivative wrt theta twice d2PhiPhi Vector3d (returned) second derivative wrt phi twice d2ThetaPhi Vector3d (returned) second derivative wrt theta and phi Returns - void Defined in core/geometry/src/geometry3d/Ellipsoid.ts Line 585 Last Updated: 13 June, 2024