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158 lines
3.6 KiB
158 lines
3.6 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 - Custom Geometry - Cube - face normals</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 = 100;
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const camera = new THREE.PerspectiveCamera(fov, aspect, near, far);
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camera.position.z = 5;
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const scene = new THREE.Scene();
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{
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const color = 0xFFFFFF;
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const intensity = 1;
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const light = new THREE.DirectionalLight(color, intensity);
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light.position.set(-1, 2, 4);
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scene.add(light);
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}
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const geometry = new THREE.Geometry();
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geometry.vertices.push(
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new THREE.Vector3(-1, -1, 1), // 0
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new THREE.Vector3( 1, -1, 1), // 1
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new THREE.Vector3(-1, 1, 1), // 2
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new THREE.Vector3( 1, 1, 1), // 3
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new THREE.Vector3(-1, -1, -1), // 4
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new THREE.Vector3( 1, -1, -1), // 5
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new THREE.Vector3(-1, 1, -1), // 6
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new THREE.Vector3( 1, 1, -1), // 7
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);
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/*
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6----7
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/| /|
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2----3 |
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| | | |
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| 4--|-5
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|/ |/
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0----1
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*/
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geometry.faces.push(
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// front
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new THREE.Face3(0, 3, 2),
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new THREE.Face3(0, 1, 3),
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// right
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new THREE.Face3(1, 7, 3),
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new THREE.Face3(1, 5, 7),
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// back
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new THREE.Face3(5, 6, 7),
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new THREE.Face3(5, 4, 6),
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// left
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new THREE.Face3(4, 2, 6),
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new THREE.Face3(4, 0, 2),
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// top
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new THREE.Face3(2, 7, 6),
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new THREE.Face3(2, 3, 7),
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// bottom
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new THREE.Face3(4, 1, 0),
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new THREE.Face3(4, 5, 1),
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);
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geometry.computeFaceNormals();
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function makeInstance(geometry, color, x) {
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const material = new THREE.MeshPhongMaterial({color});
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const cube = new THREE.Mesh(geometry, material);
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scene.add(cube);
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cube.position.x = x;
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return cube;
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}
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const cubes = [
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makeInstance(geometry, 0x44FF44, 0),
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makeInstance(geometry, 0x4444FF, -4),
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makeInstance(geometry, 0xFF4444, 4),
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];
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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 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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cubes.forEach((cube, ndx) => {
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const speed = 1 + 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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