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verge3d-code-examples
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webgl_performance.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <title>Verge3D webgl - performance</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
    <link type="text/css" rel="stylesheet" href="main.css">
    <style>
      body {
        background-color: #fff;
      }
    </style>
  </head>
  <body>

    <script type="module">

      import * as v3d from '../build/v3d.module.js';

      import Stats from './jsm/libs/stats.module.js';

      let stats;

      let camera, scene, renderer;

      let objects;

      let mouseX = 0, mouseY = 0;

      let windowHalfX = window.innerWidth / 2;
      let windowHalfY = window.innerHeight / 2;

      document.addEventListener('mousemove', onDocumentMouseMove, false);

      init();
      animate();


      function init() {

        const container = document.createElement('div');
        document.body.appendChild(container);

        camera = new v3d.PerspectiveCamera(60, window.innerWidth / window.innerHeight, 1, 10000);
        camera.position.z = 3200;

        scene = new v3d.Scene();
        scene.background = new v3d.Color(0xffffff);

        objects = [];

        const material = new v3d.MeshNormalMaterial();

        const loader = new v3d.BufferGeometryLoader();
        loader.load('models/json/suzanne_buffergeometry.json', function(geometry) {

          geometry.computeVertexNormals();

          for (let i = 0; i < 5000; i++) {

            const mesh = new v3d.Mesh(geometry, material);

            mesh.position.x = Math.random() * 8000 - 4000;
            mesh.position.y = Math.random() * 8000 - 4000;
            mesh.position.z = Math.random() * 8000 - 4000;
            mesh.rotation.x = Math.random() * 2 * Math.PI;
            mesh.rotation.y = Math.random() * 2 * Math.PI;
            mesh.scale.x = mesh.scale.y = mesh.scale.z = Math.random() * 50 + 100;

            objects.push(mesh);

            scene.add(mesh);

          }

        });

        renderer = new v3d.WebGLRenderer();
        renderer.setPixelRatio(window.devicePixelRatio);
        renderer.setSize(window.innerWidth, window.innerHeight);
        container.appendChild(renderer.domElement);

        stats = new Stats();
        container.appendChild(stats.dom);

        //

        window.addEventListener('resize', onWindowResize, false);

      }

      function onWindowResize() {

        windowHalfX = window.innerWidth / 2;
        windowHalfY = window.innerHeight / 2;

        camera.aspect = window.innerWidth / window.innerHeight;
        camera.updateProjectionMatrix();

        renderer.setSize(window.innerWidth, window.innerHeight);

      }

      function onDocumentMouseMove(event) {

        mouseX = (event.clientX - windowHalfX) * 10;
        mouseY = (event.clientY - windowHalfY) * 10;

      }

      //

      function animate() {

        requestAnimationFrame(animate);

        render();
        stats.update();

      }

      function render() {

        camera.position.x += (mouseX - camera.position.x) * .05;
        camera.position.y += (- mouseY - camera.position.y) * .05;
        camera.lookAt(scene.position);

        for (let i = 0, il = objects.length; i < il; i++) {

          objects[i].rotation.x += 0.01;
          objects[i].rotation.y += 0.02;

        }

        renderer.render(scene, camera);

      }

    </script>

  </body>
</html>