fractionToPointAndDerivatives Method
evaluate the surface at u and v fractions.
fractionToPointAndDerivatives(fractionU: number, fractionV: number, result?: Plane3dByOriginAndVectors): Plane3dByOriginAndVectors
@returns plane with origin at the surface point, direction vectors are derivatives in the u and v directions.
@returns Returns point and derivative directions.
| Parameter | Type | Description |
|---|---|---|
| fractionU | number | u coordinate, as a fraction of the knot range. |
| fractionV | number | v coordinate, as a fraction of the knot range. |
| result | Plane3dByOriginAndVectors | optional pre-allocated object for return values. |
Returns - Plane3dByOriginAndVectors
plane with origin at the surface point, direction vectors are derivatives in the u and v directions.Returns point and derivative directions.
Defined in
- bspline/BSplineSurface.ts Line 1109
Last Updated: 24 June, 2025
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