Return Values from Picked Entity

CesiumJS
1

If I'm using scene.pick(clicked.position) to access entities loaded via a (currently) single CzmlDataSource, how can I then access the properties of the entity? More precisely, how can I access the positions property if the clicked entity is a polyline? I know that I can update/change the properties, but I want to know what the actual data is instead of returning [object Object] for all of the properties.

2

Hello,

Here is an example of how to get the positions of the polyline from a pick. This prints out the current positions to the console:

var handler = new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas);
handler.setInputAction(function(click) {
var pickedObject = viewer.scene.pick(click.position);

if (Cesium.defined(pickedObject) && (pickedObject.id)) {
    console.log(pickedObject.id.polyline.positions.getValue(viewer.clock.currentTime));
}

}, Cesium.ScreenSpaceEventType.LEFT_CLICK);

``

To set the positions to a new value, you can do

pickedObjects.id.polyline.positions = Cesium.Cartesain3.fromDegreesArray([lat, lon, lat, lon,…);

``

Best,

Hannah

3

Thank you, I had forgotten about the getValue() function!

4

I do have another question, how do I get the id of the picked entity if I have the following?

    {
        "id":"Polyline_1",
  "name":"Polyline 1",
  "polyline": {
      "width":3,
      "material": {
          "solidColor": {
        "color": {
            "rgba": [255,255,255,255]
        }
          }
             },
            "positions": {
                "cartographicDegrees": [-75, 37,0,-125, 37,0]
            }
        }
    }

5

You can get this using pickedObject.id.id.

pickedObject.id is the entity, so pickedObject.id.id will be equal to the entity id provided in the CZML

-Hannah