API Reference > imodeljs-backend > ViewDefinitions > ViewDefinition > setAuxiliaryCoordinateSystemId setAuxiliaryCoordinateSystemId Method Set or clear the AuxiliaryCoordinateSystem for this ViewDefinition. setAuxiliaryCoordinateSystemId(acsId: Id64String): void Parameter Type Description acsId Id64String The Id of the new AuxiliaryCoordinateSystem. If Id64.invalid is passed, then no AuxiliaryCoordinateSystem will be used. Returns - void Defined in core/backend/src/ViewDefinition.ts Line 528 Last Updated: 13 June, 2024