Less assumptions about index layout.
Less assumptions about index layout.

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