1. A concise explanation of the problem you're experiencing.
When updating the position of a billboard in COLUMBUS_VIEW with terrain enabled the billboard disappears.
You can see the billboard again by playing with the zoom until it shows.
When in SCENE3D this is not happening.
2. A minimal code example. If you've found a bug, this helps us reproduce and repair it.
The following code can show the problem using the Sandcastle:
var viewer = new Cesium.Viewer('cesiumContainer', {
sceneMode: Cesium.SceneMode.COLUMBUS_VIEW,
terrainProvider: Cesium.createWorldTerrain()
});
viewer.scene.globe.depthTestAgainstTerrain = true;
viewer.camera.flyTo({
destination: Cesium.Cartesian3.fromDegrees(35.0, 31.0, 200000)
});
var collection = new Cesium.BillboardCollection({ scene: viewer.scene });
viewer.scene.primitives.add(collection);
var billboard = collection.add({
disableDepthTestDistance: Number.POSITIVE_INFINITY,
heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
image: "data:image/png;base64,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",
position: Cesium.Cartesian3.fromDegrees(35.0, 31.0)
});
setTimeout(function() {
billboard.position = Cesium.Cartesian3.fromDegrees(34.8, 31);
}, 10000);
4. The Cesium version you're using, your operating system and browser.
Cesium Version: 1.50
OS: Windows 10
Browser: Chrome 69