radiansToPointAndDerivatives Method
Evaluate a point and derivatives with respect to angle on the ellipsoid at angles give in radians.
- "u direction" vector of the returned plane is derivative with respect to longitude.
- "v direction" vector fo the returned plane is derivative with respect ot latitude.
radiansToPointAndDerivatives(thetaRadians: number, phiRadians: number, applyCosPhiFactor: boolean = true, result?: Plane3dByOriginAndVectors): Plane3dByOriginAndVectors
| Parameter | Type | Description |
|---|---|---|
| thetaRadians | number | longitude, in radians |
| phiRadians | number | latitude, in radians |
| applyCosPhiFactor | boolean | selector for handling of theta (around equator derivative) * if true, compute the properly scaled derivative, which goes to zero at the poles. * If false, omit he cos(phi) factor on the derivative wrt theta. This ensures it is always nonzero and can be safely used in cross product for surface normal. |
| result | Plane3dByOriginAndVectors | optional plane result |
Returns - Plane3dByOriginAndVectors
Defined in
- geometry3d/Ellipsoid.ts Line 552
Last Updated: 20 June, 2023