API Reference > geometry-core > Bspline > KnotVector > spanIndexToLeftKnotIndex spanIndexToLeftKnotIndex Method Given a span index, return the index of the knot at its left. spanIndexToLeftKnotIndex(spanIndex: number): number Parameter Type Description spanIndex number index of span Returns - number Defined in core/geometry/src/bspline/KnotVector.ts Line 359 Last Updated: 13 June, 2024