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168 lines
4.2 KiB
168 lines
4.2 KiB
<!-- 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 - Canvas Textured Cube</title>
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<style>
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html, body {
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height: 100%;
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margin: 0;
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}
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#c {
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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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</style>
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</head>
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<body>
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<canvas id="c"></canvas>
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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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}
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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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function main() {
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const canvas = document.querySelector('#c');
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const renderer = new THREE.WebGLRenderer({canvas});
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const fov = 75;
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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.z = 2;
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const scene = new THREE.Scene();
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const boxWidth = 1;
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const boxHeight = 1;
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const boxDepth = 1;
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const geometry = new THREE.BoxGeometry(boxWidth, boxHeight, boxDepth);
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const cubes = []; // just an array we can use to rotate the cubes
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const ctx = document.createElement('canvas').getContext('2d');
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ctx.canvas.width = 256;
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ctx.canvas.height = 256;
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ctx.fillStyle = '#FFF';
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ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
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const texture = new THREE.CanvasTexture(ctx.canvas);
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const material = new THREE.MeshBasicMaterial({
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map: texture,
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});
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const cube = new THREE.Mesh(geometry, material);
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scene.add(cube);
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cubes.push(cube); // add to our list of cubes to rotate
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function resizeRendererToDisplaySize(renderer) {
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const canvas = renderer.domElement;
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const width = canvas.clientWidth;
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const height = canvas.clientHeight;
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const needResize = canvas.width !== width || canvas.height !== height;
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if (needResize) {
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renderer.setSize(width, height, false);
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}
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return needResize;
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}
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function rand(min, max) {
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if (max === undefined) {
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max = min;
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min = 0;
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}
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return Math.random() * (max - min) + min;
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}
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function randVelocity() {
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return rand(2, 4) * (rand(2) < 1 ? -1 : 1);
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}
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const maxLines = 60;
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const points = [
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{ position: [rand(256), rand(256)], direction: [randVelocity(), randVelocity()]},
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{ position: [rand(256), rand(256)], direction: [randVelocity(), randVelocity()]},
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];
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const lineHistory = [];
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let lineCursor = 0;
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function drawCurrentLine() {
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const line = lineHistory[lineCursor];
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ctx.beginPath();
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ctx.moveTo(...line[0]);
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ctx.lineTo(...line[1]);
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ctx.stroke();
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}
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function drawLines(time) {
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points.forEach((point) => {
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point.position.forEach((position, ndx) => {
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const newPosition = position + point.direction[ndx];
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if (newPosition > 255) {
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point.direction[ndx] = rand(-2, -4);
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} else if (newPosition < 0) {
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point.direction[ndx] = rand( 2, 4);
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}
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point.position[ndx] = newPosition;
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});
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});
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if (lineHistory.length === maxLines) {
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ctx.lineWidth = 3;
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ctx.strokeStyle = '#FFF';
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drawCurrentLine();
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}
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lineHistory[lineCursor] = points.map(point => point.position.slice());
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ctx.lineWidth = 1;
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ctx.strokeStyle = hsl(time, 1, .5);
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drawCurrentLine();
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lineCursor = (lineCursor + 1) % maxLines;
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}
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function hsl(h, s, l) {
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return `hsl(${h * 360 | 0},${s * 100 | 0}%,${l * 100 | 0}%)`;
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}
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function render(time) {
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time *= 0.001;
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if (resizeRendererToDisplaySize(renderer)) {
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const canvas = renderer.domElement;
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camera.aspect = canvas.clientWidth / canvas.clientHeight;
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camera.updateProjectionMatrix();
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}
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drawLines(time * 0.1);
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texture.needsUpdate = true;
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cubes.forEach((cube, ndx) => {
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const speed = .2 + ndx * .1;
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const rot = time * speed;
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cube.rotation.x = rot;
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cube.rotation.y = rot;
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});
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renderer.render(scene, camera);
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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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