using forEachRenderedTile instead of forEachLoadedTile to not process unrendered straggler tiles
using forEachRenderedTile instead of forEachLoadedTile to not process unrendered straggler tiles

CesiumGS/cesium,CesiumGS/cesium,likangning93/cesium,likangning93/cesium,AnalyticalGraphicsInc/cesium,CesiumGS/cesium,likangning93/cesium,likangning93/cesium,likangning93/cesium,CesiumGS/cesium,AnalyticalGraphicsInc/cesium,CesiumGS/cesium