Modify positions of a cesium polyline programatically.

cesium_polyline_modify

var viewer = new Cesium.Viewer('cesiumContainer');

var positions = Cesium.Cartesian3.fromDegreesArray([-75, 37,
                                                    -85, 37]);

var redLine = viewer.entities.add({
    name : 'Red line on the surface',
    polyline : {
        positions : positions,
        width : 5,
        material : Cesium.Color.RED
    }
});

viewer.zoomTo(viewer.entities);

var start = -85.0;
var lat = 37.0;

setInterval(function() {
    start -= 1.0;
    positions.push(Cesium.Cartesian3.fromDegrees(start, lat));
    console.log("Pushed...");
    redLine.polyline.positions = positions;
}, 500);

Thanks for posting

It is a very useful post. thanks