fixed custom post process sandcastle
fixed custom post process sandcastle

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