Occlusion Culling(遮挡剔除)
Occluder：遮挡者
Occludee：被遮挡者
参考1：https://baijiahao.baidu.com/s?id=1740429096190145270&wfr=spider&for=pc
参考2：https://www.bilibili.com/video/BV1qt411i7sC/
>>EllipsoidalOccluder：椭球的遮挡剔除
判断一个点是否在椭球的背面
var cameraPosition = new Cesium.Cartesian3(5.0, 6.0, 7.0); var occluderEllipsoid = new Cesium.Ellipsoid(1.0, 1.1, 0.9); var occluder = new Cesium.EllipsoidalOccluder(occluderEllipsoid, cameraPosition);
参考：https://blog.csdn.net/u012425087/article/details/132382504