Display a WMTS layer on a Map.

100% © IGN
index.js 
import { MapControls } from "three/examples/jsm/controls/MapControls.js";

import Extent from "@giro3d/giro3d/core/geographic/Extent.js";
import Instance from "@giro3d/giro3d/core/Instance.js";
import ColorLayer from "@giro3d/giro3d/core/layer/ColorLayer.js";
import Map from "@giro3d/giro3d/entities/Map.js";
import Inspector from "@giro3d/giro3d/gui/Inspector.js";
import WmtsSource from "@giro3d/giro3d/sources/WmtsSource.js";

const extent = new Extent(
  "EPSG:3857",
  -20037508.342789244,
  20037508.342789244,
  -20037508.342789244,
  20037508.342789244,
);

const instance = new Instance({
  target: "view",
  crs: extent.crs,
  backgroundColor: 0x0a3b59,
});

const map = new Map({ extent });

instance.add(map);

// For convenience, we use the fromCapabilities() async method to construct a WmtsSource from
// a WMTS capabilities document.
WmtsSource.fromCapabilities(
  "https://data.geopf.fr/wmts?SERVICE=WMTS&VERSION=1.0.0&REQUEST=GetCapabilities",
  {
    layer: "GEOGRAPHICALGRIDSYSTEMS.PLANIGNV2",
    matrixSet: "PM",
  },
)
  .then((source) => {
    map.addLayer(new ColorLayer({ name: "wmts", source }));
  })
  .catch((e) => console.error(e));

instance.view.camera.position.set(0, 0, 80000000);

const controls = new MapControls(instance.view.camera, instance.domElement);

instance.view.setControls(controls);

Inspector.attach("inspector", instance);
index.html 
<!doctype html>
<html lang="en">
  <head>
    <title>WMTS layer</title>
    <meta charset="UTF-8" />
    <meta name="name" content="wmts" />
    <meta name="description" content="Display a WMTS layer on a Map." />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />

    <link rel="icon" href="https://giro3d.org/images/favicon.svg" />
    <link
      href="https://giro3d.org/assets/bootstrap-custom.css"
      rel="stylesheet"
    />
    <script src="https://giro3d.org/assets/bootstrap.bundle.min.js"></script>
    <link
      rel="stylesheet"
      type="text/css"
      href="https://giro3d.org/next/examples/css/example.css"
    />
  </head>

  <body>
    <div id="view" class="m-0 p-0 w-100 h-100"></div>
    <div
      id="inspector"
      class="position-absolute top-0 start-0 mh-100 overflow-auto"
    ></div>

    <script type="module" src="index.js"></script>
    <script>
      /* activate popovers */
      const popoverTriggerList = [].slice.call(
        document.querySelectorAll('[data-bs-toggle="popover"]'),
      );
      popoverTriggerList.map(
        // bootstrap is used as script in the template, disable warning about undef
        // eslint-disable-next-line no-undef
        (popoverTriggerEl) =>
          new bootstrap.Popover(popoverTriggerEl, {
            trigger: "hover",
            placement: "left",
            content: document.getElementById(
              popoverTriggerEl.getAttribute("data-bs-content"),
            ).innerHTML,
            html: true,
          }),
      );
    </script>
  </body>
</html>
package.json 
{
    "name": "wmts",
    "dependencies": {
        "@giro3d/giro3d": "git+https://gitlab.com/giro3d/giro3d.git"
    },
    "devDependencies": {
        "vite": "^3.2.3"
    },
    "scripts": {
        "start": "vite",
        "build": "vite build"
    }
}