cesium CLAMP_TO_GROUND 报错 Cannot read property ‘globe‘ of undefined

billboardCollection 需要添加heightReference: Cesium.HeightReference.CLAMP_TO_GROUND

var viewer = new Cesium.Viewer("cesiumContainer", {terrainProvider: new Cesium.EllipsoidTerrainProvider({}),
});
viewer.scene.globe.depthTestAgainstTerrain = true;var billboardCollection = new Cesium.BillboardCollection({});
viewer.scene.primitives.add(billboardCollection);billboardCollection.add({image: "../images/facility.gif",height: 20,width: 20,position: Cesium.Cartesian3.fromDegrees(77.273593, 38.191217),scale: 3.0,pixelOffset: new Cesium.Cartesian2(0.0, -20.0),heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,});

这时就会报错：

解决办法：必须加上scene: viewer.scene

var billboardCollection = viewer.scene.primitives.add(new Cesium.BillboardCollection({scene: viewer.scene,})
);

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