if 2D json CLAMP_TO_GROUND

CesiumJS
1

Hello,

I have json data in 2D and 3D. How lead with 2D ou 3D coordinates to CLAMP_TO_GROUND id 2D?

See my example:

viewer.dataSources.dataSourceAdded.addEventListener(function(collection,dataSource){
  
  if (Cesium.defined(dataSource)) {
    
    var entities = dataSource.entities.values;
    for (var i = 0; i < entities.length; i++) {

      var entity = entities[i];
      //console.log(dataSource.entities.values[i]);

      if (Cesium.defined(entity.polygon)) {
        console.log("...polygon");
        
        entity.polygon.material = createCallback(entity);
        entity.polygon.width = 1;
        //entity.polygon.perPositionHeight = true;
        entity.polygon.outlineColor = Cesium.Color.RED;
        entity.polygon.outlineWidth = 1;
        entity.polygon.granularity = Cesium.Math.RADIANS_PER_DEGREE;
        
        if (data2d == true){entity.polygon.extrudedHeight = 2500;}
        else {entity.polygon.extrudedHeight = 0;};
      }
    }
  }

});

Thanks

2

So one has heights and the other doesn’t?

Remove

if (data2d == true){entity.polygon.extrudedHeight = 2500;}
else {entity.polygon.extrudedHeight = 0;};

``

and instead set perPositionHeight to true if your position data has height values.

3

Hello Gabby,

But how check is coordinates are 2D or 3D? coordinates entity...

Thanks

4

An entity can use 2D or 3D coordinates. It would depend on your data, not the entities. See the Polygon Sandcastle example.

5

Hello Gabby,

This is my viewer:

  var viewer = new Cesium.Viewer('cesiumContainer', {
    terrainProvider: Cesium.createWorldTerrain({
      requestWaterMask : true,
      requestVertexNormals : true
    }),
    sceneMode: Cesium.SceneMode.SCENE3D,
    animation: false,
    timeline: false
  });

If you replace it on: https://cesiumjs.org/Cesium/Build/Apps/Sandcastle/index.html?src=Polygon.html

My problem is 'Blue polygon with holes'... with zoom start disapears :frowning:

Thanks

6

Found the problem...

After load my 2D data, I print coordinates on console and I get cartographic position coordinates with height=0 (OK) and some data with height=9.313225746154785e-10 (NOT OK)

Why this value of 9.313225746154785e-10 on 2D data?

Thanks