API Reference > imodeljs-frontend > Views > Viewport > determineVisibleDepthRange determineVisibleDepthRange Method Computes the range of npc depth values for a region of the screen determineVisibleDepthRange(rect?: ViewRect, result?: DepthRangeNpc): undefined | DepthRangeNpc Parameter Type Description rect ViewRect the rectangle to test. If undefined, test entire view result DepthRangeNpc optional DepthRangeNpc to store the result Returns - undefined | DepthRangeNpc the minimum and maximum depth values within the region, or undefined. Defined in core/frontend/src/Viewport.ts Line 1591 Last Updated: 11 June, 2024