How to draw curved polyline on the globe by constructing JSON array of data

CesiumJS
1

Hello everyone,

My goal is to draw a curved polyline on the surface of the globe.

I construct a JSON array of data where I specify positions of two points. I need these two points to be connected with the curved line, so I use property "followSurface" and set it to "true". What I get instead is two points on the globe connected with a straight line. If I place points far enough then the line shoots through the globe.

I searched throughout the forum, code examples, API Reference, but was unable to find solution to it.

Below is a snippet of my JSON array:

{
    "id":"5ba2435d-2ad3-4a2a-882b-ef5b610ea383",
    "name":"Point 1",
    "polyline":{
  "color":{
    "rgba":[
       0,255,0,255
    ]
  },
  "width":2,
  "followSurface":true,
  "show":true
  },
  "vertexPositions":{
    "cartographicDegrees":[
      55.73, 37.71, 0,
      28.30, -81.91, 0
    ]
  }
},
{
    "id":"cf09eb5a-1c4f-4a6e-bee8-0c9e6e47abf2",
    "name":"Point 2",
    "polyline":{
  "color":{
     "rgba":[
        0,255,0,255
     ]
  },
  "width":2,
  "followSurface":true,
  "show":true
  },
  "vertexPositions":{
    "cartographicDegrees":[
      28.30, -81.91, 0
      55.73, 37.71, 0,
    ]
  }
}

Any help would be appreciated.

Thanks

2

Hello,

What version of Cesium are you using? I could not reproduce this in the most recent version of Cesium.

Best,

Hannah

3

Hannah,

The version I currently use was downloaded sometime in mid 2015. Is there a way to tell what version by looking at Cesium.js file? However, I tried it with the Cesium 1.20, but had the same outcome.

Thanks

4

If you open your browser’s dev tools with your app running and Cesium loaded, and type in the command:
Cesium.VERSION

``

into the console, you should see the current version displayed.

5

Mark,

I tried the command you suggested, but it displays 'undefined'.

Thanks.