3D buildings from vector layer

Hello!

I have a problem I can not solve for a long time …

I have a vector layer with buildings. In 3D mode, they appear flat … I also want to do this building in 3D…give them height.

Here are two screenshots and source:

var vectorSourceMinsk = new ol.source.Vector({
  format: new ol.format.GeoJSON(),
  url: './minsk_buildings.geojson'
});

var vectorLayerMinsk = new ol.layer.Vector({
  source: vectorSourceMinsk,
  style: styleFunction
});

var layer = new ol.layer.Tile({
  source: new ol.source.OSM()
});

var ol2d = new ol.Map({
  layers: [layer, vectorLayerMinsk],
  target: 'map2d',
  view: new ol.View({
    center: ol.proj.fromLonLat([-74.0064, 40.7142]),
    maxZoom: 19,
    zoom: 15
  }),
  controls: controls
});

var ol3d = new olcs.OLCesium({map: ol2d});

Can you help me?

[illsio]

Could someone please just post one simple (like @ema2000) working example with the newest OLCS Library?

[ca0v]

Would be nice if https://rawgit.com/gberaudo/talks/master/2015-foss4g-seoul/examples/extrude/examples/extrude.html were fixed; https://cesiumjs.org/stk-terrain/tilesets/world/tiles/layer.json no longer exists. But it does render cubes.