API Reference > geometry-core > ArraysAndInterfaces > IndexedXYZCollection > vectorIndexIndex vectorIndexIndex MethodAbstract Return a vector from the point at indexA to the point at indexB vectorIndexIndex(indexA: number, indexB: number, result?: Vector3d): undefined | Vector3d Parameter Type Description indexA number index of point within the array indexB number index of point within the array result Vector3d caller-allocated vector. Returns - undefined | Vector3d undefined if either index is out of bounds Defined in geometry3d/IndexedXYZCollection.ts Line 76 Last Updated: 12 June, 2024