Fixed error when camera is tilted & lint error
Fixed error when camera is tilted & lint error

soceur/cesium,jasonbeverage/cesium,progsung/cesium,YonatanKra/cesium,CesiumGS/cesium,kaktus40/cesium,hodbauer/cesium,likangning93/cesium,YonatanKra/cesium,josh-bernstein/cesium,CesiumGS/cesium,soceur/cesium,YonatanKra/cesium,YonatanKra/cesium,geoscan/cesium,geoscan/cesium,soceur/cesium,likangning93/cesium,AnalyticalGraphicsInc/cesium,likangning93/cesium,CesiumGS/cesium,kaktus40/cesium,progsung/cesium,CesiumGS/cesium,hodbauer/cesium,AnalyticalGraphicsInc/cesium,likangning93/cesium,CesiumGS/cesium,jasonbeverage/cesium,josh-bernstein/cesium,likangning93/cesium,hodbauer/cesium