billboard blinking

1. A concise explanation of the problem you’re experiencing.

I add by setInterval new position to SampledPositionPropery and track billboard on it. I see blinking (see attach).

How to make smooth displaing billboard?

2. A minimal code example. If you’ve found a bug, this helps us reproduce and repair it.

const latitude = 28.458491;

const longitude = -80.528413;

const Parabola = (p, h) => {

const d = p/2;

const a = h/(d*d);

const b = 2ad;

return (t) => -att + b*t;


const altitude = Parabola(330, 100000);

const viewer = new Cesium.Viewer(‘cesiumContainer’, {

shouldAnimate: true,


const pathPosition = new Cesium.SampledPositionProperty();

const entityPath = viewer.entities.add({

position: pathPosition,

path: {

show: true,

leadTime: 0,

trailTime: Infinity,

width: 2,

resolution: 5,

material: new Cesium.ColorMaterialProperty(Cesium.Color.RED)


billboard : {

image : Cesium.buildModuleUrl(‘Assets/Textures/maki/rocket.png’),

scale : 0.5,

rotation: Cesium.Math.toRadians(45),



viewer.trackedEntity = entityPath;

let t = 0;

setInterval(() => {

let position = Cesium.Cartesian3.fromDegrees(longitude + t*0.001, latitude, altitude(t));

pathPosition.addSample(Cesium.JulianDate.fromDate(new Date()), position);


}, 1000);

3. Context. Why do you need to do this? We might know a better way to accomplish your goal.

I need display trajectory in real time

4. The Cesium version you’re using, your operating system and browser.

cesium 1.63.1, ubuntu 18.04, chrome 78

It’s disappearing because there’s no data. If you add a sample point for the current time, and the time continues to move forward, then it doesn’t know where it should go “in the future”. You could make the simulation time a few seconds behind the data stream so that there’s always data . Alternatively, you can enable forward extrapolation:

pathPosition.forwardExtrapolationType = Cesium.ExtrapolationType.EXTRAPOLATE;


Let me know if this helps.

Yes! It helps!

Thank you