How to track a moving billboard?

CesiumJS
1

hi,
I have made a moving billboard,and I want to track this moving billboard and observer it in a certain view.I can obtain the billboard’s position,then what shoud I do next?Who can tell me ?Appreciate it very much!

2

Hello,

One way to do this is to set the viewer.trackedEntity property with your billboard. The camera will lock onto the billboard and follow it.

Here’s a code example:

var viewer = new Cesium.Viewer(‘cesiumContainer’, {timeline : false, animation : false});

var pinBuilder = new Cesium.PinBuilder();

var lon = -70;

var lat = -39;

var bluePin = viewer.entities.add({

name : ‘Blank blue pin’,

position : Cesium.Cartesian3.fromDegrees(lon, lat),

billboard : {

image : pinBuilder.fromColor(Cesium.Color.ROYALBLUE, 48).toDataURL(),

verticalOrigin : Cesium.VerticalOrigin.BOTTOM

}

});

viewer.trackedEntity = bluePin;

setInterval(function(){

lon += 0.00001;

bluePin.position = Cesium.Cartesian3.fromDegrees(lon, lat);

}, 30);

``

Best,

Hannah

3

It’s awesome,thanks very much!

在 2015年7月31日星期五 UTC+8上午1:23:42，Hannah Pinkos写道：