1500字范文 > 【愚公系列】09月微信小程序-three.js绘制球体

【愚公系列】09月微信小程序-three.js绘制球体

时间：2022-11-09 20:21:52

文章目录

前言一、Three.js的使用1.球体的绘制二、球体相关js文件三、效果图四、总结

前言

Three.js 是一款运行在浏览器中的 3D 引擎，你可以用它创建各种三维场景，包括了摄影机、光影、材质等各种对象。

一个典型的 Three.js 程序至少要包括渲染器（Renderer）、场景（Scene）、照相机（Camera），以及你在场景中创建的物体。

Three.js相关文档：/

一、Three.js的使用

安装第三方包：npm i --save threejs-miniprogram

1.球体的绘制

import {createScopedThreejs } from 'threejs-miniprogram'const {renderSphere } = require('../../../lib/test-cases/sphere')const app = getApp()Page({data: {},onLoad: function () {wx.createSelectorQuery().select('#webgl').node().exec((res) => {const canvas = res[0].nodethis.canvas = canvasconst THREE = createScopedThreejs(canvas)renderSphere(canvas, THREE)//球})},play(e){let action = e.currentTarget.dataset.actionthis.fadeToAction(action)},touchStart(e) {this.canvas.dispatchTouchEvent({...e, type:'touchstart'})},touchMove(e) {this.canvas.dispatchTouchEvent({...e, type:'touchmove'})},touchEnd(e) {this.canvas.dispatchTouchEvent({...e, type:'touchend'})}})

二、球体相关js文件

export function renderSphere(canvas, THREE) {var container, stats;var camera, scene, renderer;var pointLight;var objects = [], materials = [];init();animate();function init() {camera = new THREE.PerspectiveCamera(45, canvas.width / canvas.height, 1, 2000);camera.position.set(0, 200, 800);scene = new THREE.Scene();// Gridvar helper = new THREE.GridHelper(1000, 40, 0x303030, 0x303030);helper.position.y = - 75;scene.add(helper);// Materials// var texture = new THREE.Texture(generateTexture());// texture.needsUpdate = true;// materials.push(new THREE.MeshLambertMaterial({ map: texture, transparent: true }));materials.push(new THREE.MeshLambertMaterial({color: 0xdddddd }));materials.push(new THREE.MeshPhongMaterial({color: 0xdddddd, specular: 0x009900, shininess: 30, flatShading: true }));materials.push(new THREE.MeshNormalMaterial());materials.push(new THREE.MeshBasicMaterial({color: 0xffaa00, transparent: true, blending: THREE.AdditiveBlending }));materials.push(new THREE.MeshLambertMaterial({color: 0xdddddd }));materials.push(new THREE.MeshBasicMaterial({color: 0xffaa00, wireframe: true }));// materials.push(new THREE.MeshPhongMaterial({ color: 0xdddddd, specular: 0x009900, shininess: 30, map: texture, transparent: true }));materials.push(new THREE.MeshBasicMaterial({color: 0xffaa00, transparent: true, blending: THREE.AdditiveBlending }));materials.push(new THREE.MeshNormalMaterial({flatShading: true }));materials.push(new THREE.MeshBasicMaterial({color: 0xffaa00, wireframe: true }));materials.push(new THREE.MeshDepthMaterial());materials.push(new THREE.MeshLambertMaterial({color: 0x666666, emissive: 0xff0000 }));materials.push(new THREE.MeshPhongMaterial({color: 0x000000, specular: 0x666666, emissive: 0xff0000, shininess: 10, opacity: 0.9, transparent: true }));materials.push(new THREE.MeshPhongMaterial({color: 0x000000, specular: 0x666666, emissive: 0xff0000, shininess: 10, opacity: 0.9, transparent: true }));// materials.push(new THREE.MeshBasicMaterial({ map: texture, transparent: true }));// Spheres geometryvar geometry = new THREE.SphereBufferGeometry(70, 32, 16);for (var i = 0, l = materials.length; i < l; i++) {addMesh(geometry, materials[i]);}// Lightsscene.add(new THREE.AmbientLight(0x111111));var directionalLight = new THREE.DirectionalLight(0xffffff, 0.125);directionalLight.position.x = Math.random() - 0.5;directionalLight.position.y = Math.random() - 0.5;directionalLight.position.z = Math.random() - 0.5;directionalLight.position.normalize();scene.add(directionalLight);pointLight = new THREE.PointLight(0xffffff, 1);scene.add(pointLight);pointLight.add(new THREE.Mesh(new THREE.SphereBufferGeometry(4, 8, 8), new THREE.MeshBasicMaterial({color: 0xffffff })));//renderer = new THREE.WebGLRenderer({antialias: true, alpha: true });renderer.setPixelRatio(wx.getSystemInfoSync().pixelRatio);renderer.setSize(canvas.width ,canvas.height);}function addMesh(geometry, material) {var mesh = new THREE.Mesh(geometry, material);mesh.position.x = (objects.length % 4) * 200 - 400;mesh.position.z = Math.floor(objects.length / 4) * 200 - 200;mesh.rotation.x = Math.random() * 200 - 100;mesh.rotation.y = Math.random() * 200 - 100;mesh.rotation.z = Math.random() * 200 - 100;objects.push(mesh);scene.add(mesh);}function onWindowResize() {camera.aspect = window.innerWidth / window.innerHeight;camera.updateProjectionMatrix();renderer.setSize(window.innerWidth, window.innerHeight);}function generateTexture() {canvas.width = 256;canvas.height = 256;var context = canvas.getContext('2d');var image = context.getImageData(0, 0, 256, 256);var x = 0, y = 0;for (var i = 0, j = 0, l = image.data.length; i < l; i += 4, j++) {x = j % 256;y = x == 0 ? y + 1 : y;image.data[i] = 255;image.data[i + 1] = 255;image.data[i + 2] = 255;image.data[i + 3] = Math.floor(x ^ y);}context.putImageData(image, 0, 0);return canvas;}//function animate() {render();canvas.requestAnimationFrame(animate);}function render() {var timer = 0.0005 * Date.now();camera.position.x = Math.cos(timer) * 1000;camera.position.z = Math.sin(timer) * 1000;camera.lookAt(scene.position);for (var i = 0, l = objects.length; i < l; i++) {var object = objects[i];object.rotation.x += 0.01;object.rotation.y += 0.005;}// materials[materials.length - 2].emissive.setHSL(0.54, 1, 0.35 * (0.5 + 0.5 * Math.sin(35 * timer)));// materials[materials.length - 3].emissive.setHSL(0.04, 1, 0.35 * (0.5 + 0.5 * Math.cos(35 * timer)));pointLight.position.x = Math.sin(timer * 7) * 300;pointLight.position.y = Math.cos(timer * 5) * 400;pointLight.position.z = Math.cos(timer * 3) * 300;renderer.render(scene, camera);}}