API Reference > geometry-core > CartesianGeometry > Vector3d > rotate90Around rotate90Around Method Rotate this vector 90 degrees around an axis vector. rotate90Around(axis: Vector3d, result?: Vector3d): Vector3d | undefined Parameter Type Description axis Vector3d result Vector3d Returns - Vector3d | undefined the (new or optionally reused result) rotated vector, or undefined if the axis vector cannot be normalized. Defined in core/geometry/src/geometry3d/Point3dVector3d.ts Line 830 Last Updated: 13 June, 2024