fix discontinuity for GroundPolylineGeometry due to plane origins being really far away
fix discontinuity for GroundPolylineGeometry due to plane origins being really far away

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