fractionToPointAndDerivative Method
Return the point (x,y,z) and derivative on the curve at fractional position.
- Note that the derivative is "derivative of xyz with respect to fraction".
- The derivative shows the speed of the "fractional point" moving along the curve.
- The derivative is not generally a unit vector. Use
fractionToPointAndUnitTangentfor a unit vector.
fractionToPointAndDerivative(fraction: number, result?: Ray3d): Ray3d
@returns a ray whose origin is the curve point and direction is the derivative with respect to the fraction.
| Parameter | Type | Description |
|---|---|---|
| fraction | number | fractional position along the geometry. |
| result | Ray3d | optional receiver for the result. |
Returns - Ray3d
a ray whose origin is the curve point and direction is the derivative with respect to the fraction.
Defined in
- curve/CurveChainWithDistanceIndex.ts Line 569
Last Updated: 25 April, 2024
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