Marker with altitude
index.html
<!DOCTYPE html>
<html>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>3D - Marker with altitude</title>
  <style type="text/css">
    html,body{margin:0px;height:100%;width:100%}
    .container{width:100%;height:100%}
  </style>
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/maptalks.css">
  <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/[email protected]/dist/maptalks.min.js"></script>
  <body>

    <div id="map" class="container"></div>

    <script>
      var map = new maptalks.Map('map', {
        center: [-0.113049, 51.498568],
        zoom: 14,
        pitch : 60,
        baseLayer: new maptalks.TileLayer('base', {
          urlTemplate: 'http://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png',
          subdomains: ['a','b','c','d'],
          attribution: '&copy; <a href="http://osm.org">OpenStreetMap</a> contributors, &copy; <a href="https://carto.com/">CARTO</a>'
        })
      });

      // point with altitude
      var point = new maptalks.Marker(
        [-0.113049, 51.498568],
        {
          properties : {
            altitude : 400
          }
        }
      );

      // same point without altitude
      var point0 = new maptalks.Marker(
        [-0.113049, 51.498568]
      ).updateSymbol({
        markerOpacity : 0.5,
        markerFill : '#bbb'
      });

      new maptalks.VectorLayer('vector', [point0, point], {
        enableAltitude : true,        // enable altitude
        altitudeProperty : 'altitude' // altitude property in properties, default by 'altitude'
      }).addTo(map);

    </script>
  </body>
</html>
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