123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165 |
- <!-- 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 - PreserveDrawingBuffer</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( {
- canvas,
- preserveDrawingBuffer: true,
- alpha: true,
- antialias: true
- } );
- renderer.autoClearColor = false;
- const camera = new THREE.OrthographicCamera( - 2, 2, 1, - 1, - 1, 1 );
- const scene = new THREE.Scene();
- {
- const color = 0xFFFFFF;
- const intensity = 3;
- const light = new THREE.DirectionalLight( color, intensity );
- light.position.set( - 1, 2, 4 );
- scene.add( light );
- }
- const boxWidth = 1;
- const boxHeight = 1;
- const boxDepth = 1;
- const geometry = new THREE.BoxGeometry( boxWidth, boxHeight, boxDepth );
- const base = new THREE.Object3D();
- scene.add( base );
- base.scale.set( 0.1, 0.1, 0.1 );
- function makeInstance( geometry, color, x, y, z ) {
- const material = new THREE.MeshPhongMaterial( { color } );
- const cube = new THREE.Mesh( geometry, material );
- base.add( cube );
- cube.position.set( x, y, z );
- return cube;
- }
- makeInstance( geometry, '#F00', - 2, 0, 0 );
- makeInstance( geometry, '#FF0', 2, 0, 0 );
- makeInstance( geometry, '#0F0', 0, - 2, 0 );
- makeInstance( geometry, '#0FF', 0, 2, 0 );
- makeInstance( geometry, '#00F', 0, 0, - 2 );
- makeInstance( geometry, '#F0F', 0, 0, 2 );
- 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;
- }
- const state = { x: 0, y: 0 };
- function render( time ) {
- time *= 0.001; // convert to seconds
- if ( resizeRendererToDisplaySize( renderer ) ) {
- const canvas = renderer.domElement;
- camera.right = canvas.clientWidth / canvas.clientHeight;
- camera.left = - camera.right;
- camera.updateProjectionMatrix();
- }
- base.position.set( state.x, state.y, 0 );
- base.rotation.x = time;
- base.rotation.y = time * 1.11;
- renderer.render( scene, camera );
- requestAnimationFrame( render );
- }
- requestAnimationFrame( render );
- function getCanvasRelativePosition( event ) {
- const rect = canvas.getBoundingClientRect();
- return {
- x: ( event.clientX - rect.left ) * canvas.width / rect.width,
- y: ( event.clientY - rect.top ) * canvas.height / rect.height,
- };
- }
- const temp = new THREE.Vector3();
- function setPosition( e ) {
- const pos = getCanvasRelativePosition( e );
- const x = pos.x / canvas.width * 2 - 1;
- const y = pos.y / canvas.height * - 2 + 1;
- temp.set( x, y, 0 ).unproject( camera );
- state.x = temp.x;
- state.y = temp.y;
- }
- canvas.addEventListener( 'mousemove', setPosition );
- canvas.addEventListener( 'touchmove', ( e ) => {
- e.preventDefault();
- setPosition( e.touches[ 0 ] );
- }, { passive: false } );
- }
- main();
- </script>
- </html>
|