startPointAndDerivative Method
Return the start point and derivative of the first child of the curve chain.
- For queries interior to the chain, use fractionToPointAndDerivative.
startPointAndDerivative(result?: Ray3d): Ray3d | undefined
| Parameter | Type | Description |
|---|---|---|
| result | Ray3d |
Returns - Ray3d | undefined
Defined in
- curve/CurveCollection.ts Line 439
Last Updated: 29 April, 2026
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