fractionToPointAndDerivative MethodAbstract
Return the point (x,y,z) and derivative on the curve at fractional position.
- Note that this derivative is "derivative of xyz with respect to fraction."
- this derivative shows the speed of the "fractional point" moving along the curve.
- this is not generally a unit vector. use fractionToPointAndUnitTangent for a unit vector.
fractionToPointAndDerivative(fraction: number, result?: Ray3d): Ray3d
| Parameter | Type | Description |
|---|---|---|
| fraction | number | fractional position along the geometry. |
| result | Ray3d |
Returns - Returns a ray whose origin is the curve point and direction is the derivative with respect to the fraction.
Defined in
Last Updated: 08 January, 2020