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