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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>
- <!-- Import maps polyfill -->
- <!-- Remove this when import maps will be widely supported -->
- <script async src="https://unpkg.com/[email protected]/dist/es-module-shims.js"></script>
- <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 = 1;
- 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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