场景：在模型上编辑面的时候回显点进行拖拽导致点一直被模型盖住了解决方案。

1.在 绘制/编辑 之前添加

  this.viewer.scene.globe.depthTestAgainstTerrain = true;
    //开启地形

2.设置entity

   let pointEntity = this.viewer.entities.add({
                        name: 'gon_point',
                        position: cartesian3,
                        point: {
                            color: Cesium.Color.WHITE,
                            pixelSize: 20,
                            outlineColor: Cesium.Color.BLACK.withAlpha(0.5),
                            outlineWidth: 5,
                            disableDepthTestDistance: positionsList[i].z,
                            // disableDepthTestDistance: 1000,
                            // distanceDisplayCondition: new Cesium.DistanceDisplayCondition(0, positionsList[i].z + 2500),
                            // height: 0,
                            heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
                        },
                        // viewFrom: new Cesium.Cartesian3(-100, 0, 100),
                    });