Extrude polygons for 3D indoor mapping | Mapbox GL JS

Create a 3D indoor map with the fill-extrude-height paint property.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Extrude polygons for 3D indoor mapping</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="https://api.mapbox.com/mapbox-gl-js/v2.1.1/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v2.1.1/mapbox-gl.js"></script>
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<div id="map"></div>
<script>
	// TO MAKE THE MAP APPEAR YOU MUST
	// ADD YOUR ACCESS TOKEN FROM
	// https://account.mapbox.com
	mapboxgl.accessToken = '<your access token here>';
var map = new mapboxgl.Map({
container: 'map',
style: 'mapbox://styles/mapbox/streets-v11',
center: [-87.61694, 41.86625],
zoom: 15.99,
pitch: 40,
bearing: 20,
antialias: true
});
 
map.on('load', function () {
map.addSource('floorplan', {
// GeoJSON Data source used in vector tiles, documented at
// https://gist.github.com/ryanbaumann/a7d970386ce59d11c16278b90dde094d
'type': 'geojson',
'data':
'https://docs.mapbox.com/mapbox-gl-js/assets/indoor-3d-map.geojson'
});
map.addLayer({
'id': 'room-extrusion',
'type': 'fill-extrusion',
'source': 'floorplan',
'paint': {
// See the Mapbox Style Specification for details on data expressions.
// https://docs.mapbox.com/mapbox-gl-js/style-spec/#expressions
 
// Get the fill-extrusion-color from the source 'color' property.
'fill-extrusion-color': ['get', 'color'],
 
// Get fill-extrusion-height from the source 'height' property.
'fill-extrusion-height': ['get', 'height'],
 
// Get fill-extrusion-base from the source 'base_height' property.
'fill-extrusion-base': ['get', 'base_height'],
 
// Make extrusions slightly opaque for see through indoor walls.
'fill-extrusion-opacity': 0.5
}
});
});
</script>
 
</body>
</html>