3d-mesh-flatten

Sample code supporting Google Maps Platform JavaScript API documentation. author(s): Geo Developer IX Documentation Team

HTML

<!doctype html>
<!--
 @license
 Copyright 2025 Google LLC. All Rights Reserved.
 SPDX-License-Identifier: Apache-2.0
-->

<html>
  <head>
    <title>3D Mesh Flatten</title>

    <script>
      // prettier-ignore
      (g=>{var h,a,k,p="The Google Maps JavaScript API",c="google",l="importLibrary",q="__ib__",m=document,b=window;b=b[c]||(b[c]={});var d=b.maps||(b.maps={}),r=new Set,e=new URLSearchParams,u=()=>h||(h=new Promise(async(f,n)=>{await (a=m.createElement("script"));e.set("libraries",[...r]+"");for(k in g)e.set(k.replace(/[A-Z]/g,t=>"_"+t[0].toLowerCase()),g[k]);e.set("callback",c+".maps."+q);a.src=`https://maps.${c}apis.com/maps/api/js?`+e;d[q]=f;a.onerror=()=>h=n(Error(p+" could not load."));a.nonce=m.querySelector("script[nonce]")?.nonce||"";m.head.append(a)}));d[l]?console.warn(p+" only loads once. Ignoring:",g):d[l]=(f,...n)=>r.add(f)&&u().then(()=>d[l](f,...n))})({
            });
    </script>
  </head>
  <body>
    <gmp-map-3d
      center="40.70304023274898,-73.99453903360259,397.3687221767566"
      heading="-54.63577922139952"
      tilt="65.59195953953744"
      mode="SATELLITE">
      <gmp-flattener
        path="40.707680607935245,-74.00310353377735,500 40.70829665151717,-74.00193595590612,500 40.7073748659931,-74.00122787224885,500 40.706738652153156,-74.00232125268805,500 40.70738164589913,-74.0028721484274,500">
      </gmp-flattener>
    </gmp-map-3d>

    <button class="toggleButton" id="toggleButton" type="button">
      Disable Flattener
    </button>
  </body>
</html>

CSS

/*
 * @license
 * Copyright 2026 Google LLC. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */

html,
gmp-map-3d {
  height: 100%;
}

html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

.toggleButton {
  background: rgb(235, 235, 235);
  color: black;
  border: none;
  padding: 10px 20px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  border-radius: 4px;
  cursor: pointer;
  /* Top center avoids the default UI controls and Google attribution. */
  position: fixed;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
}

.toggleButton:hover {
  background-color: #007bff;
  color: white;
}

JavaScript

'use strict';
/*
 * @license
 * Copyright 2026 Google LLC. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */

async function init() {
  await google.maps.importLibrary('maps3d');

  const map = document.querySelector('gmp-map-3d');
  const flattener = document.querySelector('gmp-flattener');
  map.append(flattener);

  const toggleButton = document.getElementById('toggleButton');
  toggleButton.addEventListener('click', () => {
    if (flattener.isConnected) {
      flattener.remove();
      toggleButton.textContent = 'Enable Flattener';
    } else {
      map.append(flattener);
      toggleButton.textContent = 'Disable Flattener';
    }
  });
}

void init();