Extrude polygons for 3D indoor mapping | TrackAsia GL JS Docs

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" />
<script src="https://unpkg.com/trackasia-gl@1.0.5/dist/trackasia-gl.js"></script>
<link href="https://unpkg.com/trackasia-gl@1.0.5/dist/trackasia-gl.css" rel="stylesheet" />
<style>
	body { margin: 0; padding: 0; }
	#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<div id="map"></div>
<script>
var map = new trackasiagl.Map({
container: 'map',
style: {
'id': 'raster',
'version': 8,
'name': 'Raster tiles',
'center': [0, 0],
'zoom': 0,
'sources': {
'raster-tiles': {
'type': 'raster',
'tiles': ['https://tile.openstreetmap.org/{z}/{x}/{y}.png'],
'tileSize': 256,
'minzoom': 0,
'maxzoom': 19
}
},
'layers': [
{
'id': 'background',
'type': 'background',
'paint': {
'background-color': '#e0dfdf'
}
},
{
'id': 'simple-tiles',
'type': 'raster',
'source': 'raster-tiles'
}
]
},
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.track-asia.com/assets/indoor-3d-map.geojson'
});
map.addLayer({
'id': 'room-extrusion',
'type': 'fill-extrusion',
'source': 'floorplan',
'paint': {
// See the TrackAsia Style Specification for details on data expressions.
// https://docs.track-asia.com/style/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>