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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 - Responsive</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 rtWidth = 512;
- const rtHeight = 512;
- const renderTarget = new THREE.WebGLRenderTarget( rtWidth, rtHeight );
- const rtFov = 75;
- const rtAspect = rtWidth / rtHeight;
- const rtNear = 0.1;
- const rtFar = 5;
- const rtCamera = new THREE.PerspectiveCamera( rtFov, rtAspect, rtNear, rtFar );
- rtCamera.position.z = 2;
- const rtScene = new THREE.Scene();
- rtScene.background = new THREE.Color( 'red' );
- {
- const color = 0xFFFFFF;
- const intensity = 3;
- const light = new THREE.DirectionalLight( color, intensity );
- light.position.set( - 1, 2, 4 );
- rtScene.add( light );
- }
- const boxWidth = 1;
- const boxHeight = 1;
- const boxDepth = 1;
- const geometry = new THREE.BoxGeometry( boxWidth, boxHeight, boxDepth );
- function makeInstance( geometry, color, x ) {
- const material = new THREE.MeshPhongMaterial( { color } );
- const cube = new THREE.Mesh( geometry, material );
- rtScene.add( cube );
- cube.position.x = x;
- return cube;
- }
- const rtCubes = [
- makeInstance( geometry, 0x44aa88, 0 ),
- makeInstance( geometry, 0x8844aa, - 2 ),
- makeInstance( geometry, 0xaa8844, 2 ),
- ];
- 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 color = 0xFFFFFF;
- const intensity = 1;
- const light = new THREE.DirectionalLight( color, intensity );
- light.position.set( - 1, 2, 4 );
- scene.add( light );
- }
- const material = new THREE.MeshPhongMaterial( {
- map: renderTarget.texture,
- } );
- const cube = new THREE.Mesh( geometry, material );
- scene.add( cube );
- 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();
- }
- // rotate all the cubes in the render target scene
- rtCubes.forEach( ( cube, ndx ) => {
- const speed = 1 + ndx * .1;
- const rot = time * speed;
- cube.rotation.x = rot;
- cube.rotation.y = rot;
- } );
- // draw render target scene to render target
- renderer.setRenderTarget( renderTarget );
- renderer.render( rtScene, rtCamera );
- renderer.setRenderTarget( null );
- // rotate the cube in the scene
- cube.rotation.x = time;
- cube.rotation.y = time * 1.1;
- // render the scene to the canvas
- renderer.render( scene, camera );
- requestAnimationFrame( render );
- }
- requestAnimationFrame( render );
- }
- main();
- </script>
- </html>
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