您好,
您可以参考下这篇博客:http://blog.csdn.net/u013929284/article/details/52653084 (9.其他问题 ②贴地线)
矢量面贴地的代码 //自定义polygon
var polygon = viewer.entities.add({
polygon : {
hierarchy : {
positions : [new Cesium.Cartesian3(290254.5148736448,5637924.074937166,2971777.4768239637),
new Cesium.Cartesian3(286432.14053509803,5640804.651089405,2966391.9275969476),
new Cesium.Cartesian3(283512.2666752818,5640502.494127799,2969385.3689191523),
new Cesium.Cartesian3(287036.36797237827,5636827.146248645,2974105.8904601005)]
},
material : Cesium.Color.BLUE.withAlpha(0.5)
}
});