API Reference > imodeljs-backend > ViewDefinitions > ViewDefinition > setAuxiliaryCoordinateSystemId setAuxiliaryCoordinateSystemId Method Set or clear the AuxiliaryCoordinateSystem for this ViewDefinition. setAuxiliaryCoordinateSystemId(acsId: string): void Parameter Type Description acsId string 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 247 Last Updated: 12 June, 2024