API Reference > imodeljs-frontend > Tiles > TileTreeReference > unionFitRange unionFitRange Method Unions this reference's range with the supplied range to help compute a volume in world space for fitting a viewport to its contents. Override this function if a reference's range should not be included in the fit range, or a range different from its tile tree's range should be used. unionFitRange(union: Range3d): void Parameter Type Description union Range3d Returns - void Defined in core/frontend/src/tile/TileTreeReference.ts Line 79 Last Updated: 11 June, 2024