API Reference > geometry-core > Curve > LineString3d > packedDerivatives packedDerivatives AccessorReadOnly Return the (optional) array of derivatives. These Are only present during certain constructions such as faceting. packedDerivatives: undefined | GrowableXYZArray Returns - undefined | GrowableXYZArray Defined in curve/LineString3d.ts Line 117 Last Updated: 11 June, 2024