API Reference > geometry-core > Polyface > IndexedPolyface > addNormal addNormal Method Add a normal vector addNormal(normal: Vector3d, priorIndexA?: number, priorIndexB?: number): number Parameter Type Description normal Vector3d priorIndexA number first index to check for possible duplicate value. priorIndexB number second index to check for possible duplicate value. Returns - number 0-based index of the added or reused normal. Defined in core/geometry/src/polyface/Polyface.ts Line 355 Last Updated: 13 June, 2024