API Reference > geometry-core > CartesianGeometry > Vector3d > plus plus Method Return the vector sum this - vector plus(vector: Readonly<WritableXYAndZ>, result?: Vector3d): Vector3d Parameter Type Description vector Readonly<WritableXYAndZ> right side of addition. result Vector3d optional preallocated result. Returns - Vector3d Defined in geometry3d/Point3dVector3d.ts Line 916 Last Updated: 11 June, 2024