Display a LAS/LAZ file.

100% Autzen stadium dataset provided by United States Geological Survey and Hobu, Inc.

Use the LASSource to display raw LAS/LAZ files. Note however that this format is not optimized for web streaming and visualization. Instead, it is recommended to use a COPCSource to load Cloud-Optimized Point Cloud LAZ files instead.

index.js 
import Instance from "@giro3d/giro3d/core/Instance.js";
import PointCloud from "@giro3d/giro3d/entities/PointCloud.js";
import Inspector from "@giro3d/giro3d/gui/Inspector.js";
import LASSource from "@giro3d/giro3d/sources/LASSource.js";
import { setLazPerfPath } from "@giro3d/giro3d/sources/las/config.js";

function placeCameraOnTop(volume, instance) {
  if (!instance) {
    return;
  }

  const center = volume.getCenter(new Vector3());
  const size = volume.getSize(new Vector3());

  const camera = instance.view.camera;
  const top = volume.max.z;
  const fov = camera.fov;
  const aspect = camera.aspect;

  const hFov = MathUtils.degToRad(fov) / 2;
  const altitude = (Math.max(size.x / aspect, size.y) / Math.tan(hFov)) * 0.5;

  instance.view.camera.position.set(center.x, center.y - 1, altitude + top);
  instance.view.camera.lookAt(center);

  const controls = new MapControls(instance.view.camera, instance.domElement);
  controls.target.copy(center);
  controls.enableDamping = true;
  controls.dampingFactor = 0.25;

  instance.view.setControls(controls);
  instance.notifyChange(instance.view.camera);
}

// LAS processing requires the WebAssembly laz-perf library
// This path is specific to your project, and must be set accordingly.
setLazPerfPath("/assets/wasm");

const url = "https://3d.oslandia.com/giro3d/pointclouds/autzen-simplified.laz";

const instance = new Instance({
  crs: "EPSG:3857",
  target: "view",
  backgroundColor: null,
});

async function load(url) {
  const source = new LASSource({ url });

  const entity = new PointCloud({ source });

  await instance.add(entity);

  entity.setActiveAttribute("Color");

  placeCameraOnTop(entity.getBoundingBox(), instance);
}

load(url).catch(console.error);

Inspector.attach("inspector", instance);
index.html 
<!doctype html>
<html lang="en">
  <head>
    <title>LAS/LAZ files.</title>
    <meta charset="UTF-8" />
    <meta name="name" content="las" />
    <meta name="description" content="Display a LAS/LAZ file." />
    <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/latest/examples/css/example.css"
    />

    <style>
      #view canvas {
        background: rgb(132, 170, 182);
        background: radial-gradient(
          circle,
          rgba(132, 170, 182, 1) 0%,
          rgba(37, 44, 48, 1) 100%
        );
      }
    </style>
  </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": "las",
    "dependencies": {
        "@giro3d/giro3d": "0.41.0"
    },
    "devDependencies": {
        "vite": "^3.2.3"
    },
    "scripts": {
        "start": "vite",
        "build": "vite build"
    }
}