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199 lines
5.6 KiB
199 lines
5.6 KiB
2 years ago
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<!-- Licensed under a BSD license. See license.html for license -->
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
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<title>Three.js - Multiple Scenes - Copy</title>
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<style>
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canvas {
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width: 100%;
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height: 100%;
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display: block;
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}
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*[data-diagram] {
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display: inline-block;
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width: 5em;
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height: 3em;
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}
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.left {
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float: left;
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margin-right: .25em;
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}
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.right {
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float: right;
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margin-left: .25em;
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}
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p {
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margin: 1em auto;
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max-width: 500px;
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font-size: xx-large;
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}
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</style>
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</head>
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<body>
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<p>
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<span data-diagram="box" class="left"></span>
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I love boxes. Presents come in boxes.
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When I find a new box I'm always excited to find out what's inside.
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</p>
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<p>
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<span data-diagram="pyramid" class="right"></span>
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When I was a kid I dreamed of going on an expedition inside a pyramid
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and finding a undiscovered tomb full of mummies and treasure.
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</p>
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</body>
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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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<script type="importmap">
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{
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"imports": {
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"three": "../../build/three.module.js",
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"three/addons/": "../../examples/jsm/"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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import {TrackballControls} from 'three/addons/controls/TrackballControls.js';
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function main() {
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const canvas = document.createElement('canvas');
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const renderer = new THREE.WebGLRenderer({canvas, alpha: true});
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renderer.setScissorTest(true);
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const sceneElements = [];
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function addScene(elem, fn) {
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const ctx = document.createElement('canvas').getContext('2d');
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elem.appendChild(ctx.canvas);
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sceneElements.push({elem, ctx, fn});
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}
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function makeScene(elem) {
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const scene = new THREE.Scene();
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const fov = 45;
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const aspect = 2; // the canvas default
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const near = 0.1;
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const far = 5;
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const camera = new THREE.PerspectiveCamera(fov, aspect, near, far);
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camera.position.set(0, 1, 2);
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camera.lookAt(0, 0, 0);
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scene.add(camera);
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const controls = new TrackballControls(camera, elem);
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controls.noZoom = true;
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controls.noPan = true;
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{
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const color = 0xFFFFFF;
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const intensity = 1;
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const light = new THREE.DirectionalLight(color, intensity);
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light.position.set(-1, 2, 4);
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camera.add(light);
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}
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return {scene, camera, controls};
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}
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const sceneInitFunctionsByName = {
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'box': (elem) => {
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const {scene, camera, controls} = makeScene(elem);
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const geometry = new THREE.BoxGeometry(1, 1, 1);
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const material = new THREE.MeshPhongMaterial({color: 'red'});
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const mesh = new THREE.Mesh(geometry, material);
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scene.add(mesh);
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return (time, rect) => {
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mesh.rotation.y = time * .1;
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camera.aspect = rect.width / rect.height;
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camera.updateProjectionMatrix();
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controls.handleResize();
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controls.update();
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renderer.render(scene, camera);
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};
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},
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'pyramid': (elem) => {
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const {scene, camera, controls} = makeScene(elem);
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const radius = .8;
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const widthSegments = 4;
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const heightSegments = 2;
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const geometry = new THREE.SphereGeometry(radius, widthSegments, heightSegments);
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const material = new THREE.MeshPhongMaterial({
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color: 'blue',
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flatShading: true,
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});
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const mesh = new THREE.Mesh(geometry, material);
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scene.add(mesh);
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return (time, rect) => {
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mesh.rotation.y = time * .1;
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camera.aspect = rect.width / rect.height;
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camera.updateProjectionMatrix();
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controls.handleResize();
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controls.update();
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renderer.render(scene, camera);
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};
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},
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};
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document.querySelectorAll('[data-diagram]').forEach((elem) => {
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const sceneName = elem.dataset.diagram;
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const sceneInitFunction = sceneInitFunctionsByName[sceneName];
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const sceneRenderFunction = sceneInitFunction(elem);
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addScene(elem, sceneRenderFunction);
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});
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function render(time) {
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time *= 0.001;
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for (const {elem, fn, ctx} of sceneElements) {
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// get the viewport relative position of this element
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const rect = elem.getBoundingClientRect();
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const {left, right, top, bottom, width, height} = rect;
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const rendererCanvas = renderer.domElement;
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const isOffscreen =
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bottom < 0 ||
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top > window.innerHeight ||
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right < 0 ||
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left > window.innerWidth;
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if (!isOffscreen) {
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// make sure the renderer's canvas is big enough
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if (rendererCanvas.width < width || rendererCanvas.height < height) {
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renderer.setSize(width, height, false);
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}
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// make sure the canvas for this area is the same size as the area
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if (ctx.canvas.width !== width || ctx.canvas.height !== height) {
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ctx.canvas.width = width;
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ctx.canvas.height = height;
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}
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renderer.setScissor(0, 0, width, height);
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renderer.setViewport(0, 0, width, height);
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fn(time, rect);
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// copy the rendered scene to this element's canvas
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ctx.globalCompositeOperation = 'copy';
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ctx.drawImage(
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rendererCanvas,
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0, rendererCanvas.height - height, width, height, // src rect
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0, 0, width, height); // dst rect
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}
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}
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requestAnimationFrame(render);
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}
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requestAnimationFrame(render);
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}
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main();
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</script>
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</html>
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