API Reference > geometry-core > CartesianGeometry > Vector3d > interpolate interpolate Method Return a vector computed at fractional position between this vector and vectorB interpolate(fraction: number, vectorB: Readonly<WritableXYAndZ>, result?: Vector3d): Vector3d Parameter Type Description fraction number fractional position. 0 is at this. 1 is at vectorB. True fractions are "between", negatives are "before this", beyond 1 is "beyond vectorB". vectorB Readonly<WritableXYAndZ> second vector result Vector3d optional preallocated result. Returns - Vector3d Defined in geometry3d/Point3dVector3d.ts Line 897 Last Updated: 12 June, 2024