API Reference > geometry-core > Bspline > BSpline2dNd > evaluateBuffersAtKnot evaluateBuffersAtKnot Method Evaluate the _basisBuffer, _poleBuffer and (optionally) _basisBuffer1 and _poleBuffer1 arrays at given knot. evaluateBuffersAtKnot(u: number, v: number, numDerivative: number = 0): void Parameter Type Description u number u knot value v number v not value numDerivative number number of derivatives needed Returns - void Defined in bspline/BSplineSurface.ts Line 404 Last Updated: 11 June, 2024