master

分支 (1)

管理

管理

master

verge3d-code-examples
/
webgl_instancing_raycast.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <title>Verge3D webgl - instancing - raycast</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">
  </head>
  <body>
    <script type="module">

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

      import Stats from './jsm/libs/stats.module.js';
      import { GUI } from './jsm/libs/dat.gui.module.js';
      import { OrbitControls } from "./jsm/controls/OrbitControls.js";

      let camera, scene, renderer, stats;

      let mesh;
      const amount = parseInt(window.location.search.substr(1)) || 10;
      const count = Math.pow(amount, 3);

      const raycaster = new v3d.Raycaster();
      const mouse = new v3d.Vector2(1, 1);

      const color = new v3d.Color();

      init();
      animate();

      function init() {

        camera = new v3d.PerspectiveCamera(60, window.innerWidth / window.innerHeight, 0.1, 100);
        camera.position.set(amount, amount, amount);
        camera.lookAt(0, 0, 0);

        scene = new v3d.Scene();

        const light1 = new v3d.HemisphereLight(0xffffff, 0x000088);
        light1.position.set(- 1, 1.5, 1);
        scene.add(light1);

        const light2 = new v3d.HemisphereLight(0xffffff, 0x880000, 0.5);
        light2.position.set(- 1, - 1.5, - 1);
        scene.add(light2);

        const geometry = new v3d.IcosahedronGeometry(0.5, 3);
        const material = new v3d.MeshPhongMaterial();

        mesh = new v3d.InstancedMesh(geometry, material, count);

        let i = 0;
        const offset = (amount - 1) / 2;

        const matrix = new v3d.Matrix4();

        for (let x = 0; x < amount; x ++) {

          for (let y = 0; y < amount; y ++) {

            for (let z = 0; z < amount; z ++) {

              matrix.setPosition(offset - x, offset - y, offset - z);

              mesh.setMatrixAt(i, matrix);
              mesh.setColorAt(i, color);

              i++;

            }

          }

        }

        scene.add(mesh);

        //

        const gui = new GUI();
        gui.add(mesh, 'count', 0, count);

        renderer = new v3d.WebGLRenderer({ antialias: true });
        renderer.setPixelRatio(window.devicePixelRatio);
        renderer.setSize(window.innerWidth, window.innerHeight);
        document.body.appendChild(renderer.domElement);

        new OrbitControls(camera, renderer.domElement);

        stats = new Stats();
        document.body.appendChild(stats.dom);

        window.addEventListener('resize', onWindowResize, false);
        document.addEventListener('mousemove', onMouseMove, false);

      }

      function onWindowResize() {

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

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

      }

      function onMouseMove(event) {

        event.preventDefault();

        mouse.x = (event.clientX / window.innerWidth) * 2 - 1;
        mouse.y = - (event.clientY / window.innerHeight) * 2 + 1;

      }

      function animate() {

        requestAnimationFrame(animate);

        render();

      }

      function render() {

        raycaster.setFromCamera(mouse, camera);

        const intersection = raycaster.intersectObject(mesh);

        if (intersection.length > 0) {

          const instanceId = intersection[0].instanceId;

          mesh.setColorAt(instanceId, color.setHex(Math.random() * 0xffffff));
          mesh.instanceColor.needsUpdate = true;

        }

        renderer.render(scene, camera);

        stats.update();

      }

    </script>
  </body>
</html>