javascript
/
three.js
mirror of https://github.com/tazdij/three.js.git


			
				
					
						
						
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							<!-- Licensed under a BSD license. See license.html for license -->
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
    <title>Three.js - Cleanup</title>
    <style>
    html, body {
        height: 100%;
        margin: 0;
    }
    #c {
        width: 100%;
        height: 100%;
        display: block;
    }
    #root {
      position: absolute;
      left: 0;
      top: 0;
    }
    </style>
  </head>
  <body>
    <canvas id="c"></canvas>
  </body>
<script type="module">
import * as THREE from '../../build/three.module.js';

class ResourceTracker {
  constructor() {
    this.resources = new Set();
  }
  track(resource) {
    if (resource.dispose || resource instanceof THREE.Object3D) {
      this.resources.add(resource);
    }
    return resource;
  }
  untrack(resource) {
    this.resources.delete(resource);
  }
  dispose() {
    for (const resource of this.resources) {
      if (resource instanceof THREE.Object3D) {
        if (resource.parent) {
          resource.parent.remove(resource);
        }
      }
      if (resource.dispose) {
        resource.dispose();
      }
    }
    this.resources.clear();
  }
}

function main() {
  const canvas = document.querySelector('#c');
  const renderer = new THREE.WebGLRenderer({canvas});

  const fov = 75;
  const aspect = 2;  // the canvas default
  const near = 0.1;
  const far = 5;
  const camera = new THREE.PerspectiveCamera(fov, aspect, near, far);
  camera.position.z = 2;

  const scene = new THREE.Scene();
  const cubes = [];  // an array we can use to rotate the cubes

  function addStuffToScene() {
    const resTracker = new ResourceTracker();
    const track = resTracker.track.bind(resTracker);

    const boxWidth = 1;
    const boxHeight = 1;
    const boxDepth = 1;
    const geometry = track(new THREE.BoxGeometry(boxWidth, boxHeight, boxDepth));

    const loader = new THREE.TextureLoader();

    const material = track(new THREE.MeshBasicMaterial({
      map: track(loader.load('resources/images/wall.jpg')),
    }));
    const cube = track(new THREE.Mesh(geometry, material));
    scene.add(cube);
    cubes.push(cube);  // add to our list of cubes to rotate
    return resTracker;
  }

  function waitSeconds(seconds = 0) {
    return new Promise(resolve => setTimeout(resolve, seconds * 1000));
  }

  async function process() {
    for (;;) {
      const resTracker = addStuffToScene();
      await waitSeconds(2);
      cubes.length = 0;  // remove the cubes
      resTracker.dispose();
      await waitSeconds(1);
    }
  }
  process();

  function resizeRendererToDisplaySize(renderer) {
    const canvas = renderer.domElement;
    const width = canvas.clientWidth;
    const height = canvas.clientHeight;
    const needResize = canvas.width !== width || canvas.height !== height;
    if (needResize) {
      renderer.setSize(width, height, false);
    }
    return needResize;
  }

  function render(time) {
    time *= 0.001;

    if (resizeRendererToDisplaySize(renderer)) {
      const canvas = renderer.domElement;
      camera.aspect = canvas.clientWidth / canvas.clientHeight;
      camera.updateProjectionMatrix();
    }

    cubes.forEach((cube, ndx) => {
      const speed = .2 + ndx * .1;
      const rot = time * speed;
      cube.rotation.x = rot;
      cube.rotation.y = rot;
    });

    renderer.render(scene, camera);

    requestAnimationFrame(render);
  }

  requestAnimationFrame(render);
}

main();
</script>
</html>