Hi,

I’m trying to implement a `point-select`

logic as a combination of picking example and point example

The problem is after I zoom in, 3D terrain data will be loaded and the points will be covered by the terrains.

The 2D map works well.

To solve it, I’m trying to pick up the altitude of my click position and set it as the altitude of point like this:

var cartesian = viewer.camera.pickEllipsoid(movement.position, viewer.scene.globe.ellipsoid);

var cartographic = Cesium.Cartographic.fromCartesian(cartesian);

var longitude = Cesium.Math.toDegrees(cartographic.longitude).toFixed(10);

var latitude = Cesium.Math.toDegrees(cartographic.latitude).toFixed(10);

var altitude = cartographic.height;

But sadly, I can only get 0 as the height.

I’m wondering is there any way to solve that? How could I know the altitude of terrain at certain position(latitude/longitude).