var region = viewer.entities.add(new Cesium.Entity({
polygon: new Cesium.PolygonGraphics({
hierarchy: Cesium.Cartesian3.fromDegreesArray([116.4498083382989, 39.90540439945022,
116.44979232852756, 39.906705618392685,
116.45150065086875, 39.90652208168731,
116.45130690418412, 39.905318570932856
]),
material: Cesium.Color.RED,
}),
clampToS3M: true
}))
设置clampToS3M: true即可,注意,目前仅支持面贴对象