destroy also frees depthFailAppearance resources
destroy also frees depthFailAppearance resources

likangning93/cesium,AnalyticalGraphicsInc/cesium,YonatanKra/cesium,likangning93/cesium,progsung/cesium,CesiumGS/cesium,progsung/cesium,YonatanKra/cesium,likangning93/cesium,AnalyticalGraphicsInc/cesium,CesiumGS/cesium,YonatanKra/cesium,CesiumGS/cesium,CesiumGS/cesium,YonatanKra/cesium,CesiumGS/cesium,likangning93/cesium,likangning93/cesium