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Extrude polygons for 3D indoor mapping

Create a 3D indoor map with the fill-extrude-height paint property.

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Extrude polygons for 3D indoor mapping</title>
    <meta property="og:description" content="Create a 3D indoor map with the fill-extrude-height paint property." />
    <meta charset='utf-8'>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel='stylesheet' href='https://unpkg.com/[email protected]/dist/maplibre-gl.css' />
    <script src='https://unpkg.com/[email protected]/dist/maplibre-gl.js'></script>
    <style>
        body { margin: 0; padding: 0; }
        html, body, #map { height: 100%; }
    </style>
</head>
<body>
<div id="map"></div>
<script>
    const map = new maplibregl.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', () => {
        map.addSource('floorplan', {
            // GeoJSON Data source used in vector tiles, documented at
            // https://gist.github.com/ryanbaumann/a7d970386ce59d11c16278b90dde094d
            'type': 'geojson',
            'data': 'https://maplibre.org/maplibre-gl-js/docs/assets/indoor-3d-map.geojson'
        });
        map.addLayer({
            'id': 'room-extrusion',
            'type': 'fill-extrusion',
            'source': 'floorplan',
            'paint': {
                // See the MapLibre Style Specification for details on data expressions.
                // https://maplibre.org/maplibre-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>