API Reference > geometry-core > Numerics > Point4d > createRealDerivativeRay3dDefault000 createRealDerivativeRay3dDefault000 MethodStatic If w is nonzero, return Vector3d which is the derivative of the projected xyz with given w and 4d derivatives. If w is zero, return 000 createRealDerivativeRay3dDefault000(x: number, y: number, z: number, w: number, dx: number, dy: number, dz: number, dw: number, result?: Ray3d): Ray3d Parameter Type Description x number x coordinate y number y coordinate z number z coordinate w number w coordinate dx number x coordinate of derivative dy number y coordinate of derivative dz number z coordinate of derivative dw number w coordinate of derivative result Ray3d optional result Returns - Ray3d Defined in geometry4d/Point4d.ts Line 412 Last Updated: 12 June, 2024