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. get: GrowableXYZArray | undefined Returns - GrowableXYZArray | undefined Defined in core/geometry/src/curve/LineString3d.ts Line 117 Last Updated: 15 June, 2021