API Reference > geometry-core > ArraysAndInterfaces > IndexedXYZCollection > crossProductXYAndZIndexIndex crossProductXYAndZIndexIndex MethodAbstract Return the cross product of the vectors from origin to points at indexA and indexB crossProductXYAndZIndexIndex(origin: Readonly<WritableXYAndZ>, indexA: number, indexB: number, result?: Vector3d): undefined | Vector3d Parameter Type Description origin Readonly<WritableXYAndZ> origin for vector indexA number index of first target within the array indexB number index of second target 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 94 Last Updated: 11 June, 2024