前言

在上一篇文章簡單粗略的描述了開發(fā)3D汽車展廳，筆者想再寫一篇比較詳細(xì)的教程。對于筆者來說Three.js說難不難，說簡單也不簡單。說簡單因?yàn)樗喕藢θS知識的理解，簡化了很多操作。說難是因?yàn)閍pi很多，要用熟也不是一朝半夕的時(shí)間。筆者在這給大家介紹一下以最簡單方式打造一個3D汽車展示廳。這個3D汽車展廳實(shí)現(xiàn)出來也不算完整，主要想讓同學(xué)們找找感覺，找些成就感，有感覺自己也有學(xué)下去的動力。^_^

簡單粗略了解三維

在2D里只有兩個坐標(biāo),分別是X軸，和Y軸。在3D就多了一個Z軸。相信剛學(xué)3D的同學(xué)對X軸和Y軸都比較熟悉，Z軸是比較陌生，筆者建議大家可以上 three編輯器的網(wǎng)站嘗試創(chuàng)建一些幾何物體，找找對3D理解。

完整效果

需要了解這幾個概念

筆者用舞臺表演來比如:

既然知道這幾個概念，我們就根據(jù)這幾大概念以函數(shù)形式區(qū)分，就很好理解。在這個three程序我分別創(chuàng)建了: setScene、setCarma、 loadfile、setLight、setControls分別對應(yīng)以上幾個概念

創(chuàng)建場景

首先我們還是用vue3的setup方式編寫，npm安裝three包， 引入 Scene，WebGLRenderer 兩個對象，創(chuàng)建兩個變量 scene、renderer并賦值，這樣就簡單搭建了一個場景，場景背景默認(rèn)是黑色。創(chuàng)建一個init初始化函數(shù)，并在onMounted調(diào)用

<script setup> import {onMounted} from 'vue' import { Scene,WebGLRenderer,PerspectiveCamera} from 'three' let scene,renderer //創(chuàng)建場景 const setScene = ()=>{ scene = new Scene() renderer = new WebGLRenderer() renderer.setSize(innerWidth, innerHeight) document.querySelector('.boxs').appendChild(renderer.domElement) } //初始化所有函數(shù) const init = () => { setScene() } //用vue鉤子函數(shù)調(diào)用 onMounted(init) </script>

創(chuàng)建相機(jī)

有了場景就要加相機(jī)，相機(jī)相當(dāng)于人的眼睛去觀察幾何物體,引入PerspectiveCamera， 參數(shù)有4個，具體可以看看官網(wǎng)文檔。然后通過實(shí)例方法position.set設(shè)置相機(jī)坐標(biāo)

<script setup> import { Scene,WebGLRenderer,PerspectiveCamera} from 'three' let scene,renderer,camera //相機(jī)的默認(rèn)坐標(biāo) const defaultMap = { x: 510, y: 128, z: 0, } //創(chuàng)建場景 const setScene = ()=>{ scene = new Scene() renderer = new WebGLRenderer() renderer.setSize(innerWidth, innerHeight) document.querySelector('.boxs').appendChild(renderer.domElement) } //創(chuàng)建相機(jī) const setCamera = () => { const {x, y, z} = defaultMap camera = new PerspectiveCamera(60, innerWidth / innerHeight, 1, 1000) camera.position.set(x, y, z) } //初始化所有函數(shù) const init = () => { setScene() setCamera() } //用vue鉤子函數(shù)調(diào)用 onMounted(init) </script>

引入特斯拉模型

在three我們除了可以通過api創(chuàng)建幾何物體，還可以引入第三方3d模型，具體可以上 sketchfab ，國外一個3d模型下載網(wǎng)站，里面有很多免費(fèi)的模型下載，這次用特斯拉汽車模型為例，下載一個gltf格式的3D模型。引入GLTFLoader 創(chuàng)建一個loadfile函數(shù)并通過Promise返回模型數(shù)據(jù)，在init函數(shù)加上async調(diào)用loadfile得到返回模型數(shù)據(jù)并添加到場景scene

import {GLTFLoader} from 'three/examples/jsm/loaders/GLTFLoader' import { Scene,WebGLRenderer,PerspectiveCamera} from 'three' let scene,renderer,camera,directionalLight,dhelper let isLoading = ref(true) let loadingWidth = ref(0) //相機(jī)的默認(rèn)坐標(biāo) const defaultMap = { x: 510, y: 128, z: 0, } //創(chuàng)建場景 const setScene = ()=>{ scene = new Scene() renderer = new WebGLRenderer() renderer.setSize(innerWidth, innerHeight) document.querySelector('.boxs').appendChild(renderer.domElement) } //創(chuàng)建相機(jī) const setCamera = () => { const {x, y, z} = defaultMap camera = new PerspectiveCamera(60, innerWidth / innerHeight, 1, 1000) camera.position.set(x, y, z) } //通過Promise處理一下loadfile函數(shù) const loadFile = (url) => { return new Promise(((resolve, reject) => { loader.load(url, (gltf) => { resolve(gltf) }, ({loaded, total}) => { let load = Math.abs(loaded / total * 100) loadingWidth.value = load if (load >= 100) { setTimeout(() => { isLoading.value = false }, 1000) } console.log((loaded / total * 100) + '% loaded') }, (err) => { reject(err) } ) })) } //初始化所有函數(shù) const init = async() => { const gltf =await loadFile('src/assets/3d/tesla_2018_model_3/scene.gltf') setScene() setCamera() scene.add(gltf.scene) } //用vue鉤子函數(shù)調(diào)用 onMounted(init)

創(chuàng)建燈光

汽車模型還看不見，所以我們要給它設(shè)置燈光，引入DirectionalLight,DirectionalLightHelper,HemisphereLight,HemisphereLightHelper,并設(shè)置燈光的參數(shù)，使模型可見，并有些反射光面,陰影的效果，然后也在init函數(shù)調(diào)用 setLight，再增加loop函數(shù)，使場景、照相機(jī)、模型不停循環(huán)調(diào)用。然后車模型就能看見啦,看到車出現(xiàn)的那一刻，好像自己的新買的一樣，^_^

import {GLTFLoader} from 'three/examples/jsm/loaders/GLTFLoader' import { Scene,WebGLRenderer,PerspectiveCamera, DirectionalLight, DirectionalLightHelper, HemisphereLight, HemisphereLightHelper} from 'three' let scene,renderer,camera,directionalLight,hemisphereLight,dhelper,hHelper let isLoading = ref(true) let loadingWidth = ref(0) //相機(jī)的默認(rèn)坐標(biāo) const defaultMap = { x: 510, y: 128, z: 0, } //創(chuàng)建場景 const setScene = ()=>{ scene = new Scene() renderer = new WebGLRenderer() renderer.setSize(innerWidth, innerHeight) document.querySelector('.boxs').appendChild(renderer.domElement) } //創(chuàng)建相機(jī) const setCamera = () => { const {x, y, z} = defaultMap camera = new PerspectiveCamera(60, innerWidth / innerHeight, 1, 1000) camera.position.set(x, y, z) } //通過Promise處理一下loadfile函數(shù) const loadFile = (url) => { return new Promise(((resolve, reject) => { loader.load(url, (gltf) => { resolve(gltf) }, ({loaded, total}) => { let load = Math.abs(loaded / total * 100) loadingWidth.value = load if (load >= 100) { setTimeout(() => { isLoading.value = false }, 1000) } console.log((loaded / total * 100) + '% loaded') }, (err) => { reject(err) } ) })) } // 設(shè)置燈光 const setLight = () => { directionalLight = new DirectionalLight(0xffffff, 0.5) directionalLight.position.set(-4, 8, 4) dhelper = new DirectionalLightHelper(directionalLight, 5, 0xff0000) hemisphereLight = new HemisphereLight(0xffffff, 0xffffff, 0.4) hemisphereLight.position.set(0, 8, 0) hHelper = new HemisphereLightHelper(hemisphereLight, 5) scene.add(directionalLight) scene.add(hemisphereLight) } //初始化所有函數(shù) const init = async() => { const gltf = await loadFile('src/assets/3d/tesla_2018_model_3/scene.gltf') setScene() setCamera() setLight() scene.add(gltf.scene) loop() } //使場景、照相機(jī)、模型不停調(diào)用 const loop = () => { requestAnimationFrame(loop) renderer.render(scene, camera) } //用vue鉤子函數(shù)調(diào)用 onMounted(init)

控制模型

想用鼠標(biāo)自由旋轉(zhuǎn)，或者自動旋轉(zhuǎn)，就要引用 OrbitControls對象，創(chuàng)建setControls函數(shù)也是在init調(diào)用，通過綁定change還可以監(jiān)聽坐標(biāo)變化，另外也要在loop函數(shù)增加 controls.update()才可以更新位置變化

import { Scene,WebGLRenderer,PerspectiveCamera} from 'three' import {GLTFLoader} from 'three/examples/jsm/loaders/GLTFLoader' import {OrbitControls} from 'three/examples/jsm/controls/OrbitControls.js' let scene,renderer,camera,directionalLight,hemisphereLight,dhelper,hHelper,controls let isLoading = ref(true) let loadingWidth = ref(0) //相機(jī)的默認(rèn)坐標(biāo) const defaultMap = { x: 510, y: 128, z: 0, } //創(chuàng)建場景 const setScene = ()=>{ scene = new Scene() renderer = new WebGLRenderer() renderer.setSize(innerWidth, innerHeight) document.querySelector('.boxs').appendChild(renderer.domElement) } //創(chuàng)建相機(jī) const setCamera = () => { const {x, y, z} = defaultMap camera = new PerspectiveCamera(60, innerWidth / innerHeight, 1, 1000) camera.position.set(x, y, z) } //通過Promise處理一下loadfile函數(shù) const loadFile = (url) => { return new Promise(((resolve, reject) => { loader.load(url, (gltf) => { resolve(gltf) }, ({loaded, total}) => { let load = Math.abs(loaded / total * 100) loadingWidth.value = load if (load >= 100) { setTimeout(() => { isLoading.value = false }, 1000) } console.log((loaded / total * 100) + '% loaded') }, (err) => { reject(err) } ) })) } // 設(shè)置燈光 const setLight = () => { directionalLight = new DirectionalLight(0xffffff, 0.5) directionalLight.position.set(-4, 8, 4) dhelper = new DirectionalLightHelper(directionalLight, 5, 0xff0000) hemisphereLight = new HemisphereLight(0xffffff, 0xffffff, 0.4) hemisphereLight.position.set(0, 8, 0) hHelper = new HemisphereLightHelper(hemisphereLight, 5) scene.add(directionalLight) scene.add(hemisphereLight) } // 設(shè)置模型控制 const setControls = () => { controls = new OrbitControls(camera, renderer.domElement) controls.maxPolarAngle = 0.9 * Math.PI / 2 controls.enableZoom = true controls.addEventListener('change', render) } const render = () => { map.x = Number.parseInt(camera.position.x) map.y = Number.parseInt(camera.position.y) map.z = Number.parseInt(camera.position.z) } //初始化所有函數(shù) const init = async() => { const gltf =await loadFile('src/assets/3d/tesla_2018_model_3/scene.gltf') setScene() setCamera() setLight() setControls() scene.add(gltf.scene) } //使場景、照相機(jī)、模型不停調(diào)用和更新位置數(shù)據(jù) const loop = () => { requestAnimationFrame(loop) renderer.render(scene, camera) controls.update() } //用vue鉤子函數(shù)調(diào)用 onMounted(init)

改變車身顏色

到這里基礎(chǔ)的已經(jīng)搭建好了,接下來我們再加一個功能改變汽車車身顏色,也是展廳展示一個比較基礎(chǔ)的功能.創(chuàng)建一個setColor 這里說一下實(shí)例scene 有一個traverse函數(shù)，它回調(diào)了所有模型的子模型信息，只要我們找到對應(yīng)name屬性，就可以更改顏色，和增加貼圖等等， 因?yàn)閷δＰ徒Y(jié)構(gòu)不怎熟悉,所以根據(jù)名字來猜了一下 找到door_前序的名字大概應(yīng)該就車身的套件。當(dāng)然如果細(xì)分到我只想改引擎蓋的顏色就要找出引擎蓋套件。當(dāng)然要很熟悉這個模型結(jié)構(gòu)了

//設(shè)置車身顏色 const setCarColor = (index) => { const currentColor = new Color(colorAry[index]) scene.traverse(child => { if (child.isMesh) { console.log(child.name) if (child.name.includes('door_')) { child.material.color.set(currentColor) } } }) }

上完整代碼

其他操作都是交給vue控制，包括設(shè)置車身顏色、是否自動轉(zhuǎn)動等等。大家運(yùn)行以下代碼的時(shí)候記得用vite打包工具創(chuàng)建vue3模板

<template> <div class="boxs"> <div class="maskLoading" v-if="isLoading"> <div class="loading"> <div :style="{width : loadingWidth +'%' }"></div> </div> <div style="padding-left: 10px;">{{parseInt(loadingWidth)}}%</div> </div> <div class="mask"> <p>x : {{x}} y:{{y}} z :{{z}}</p> <button @click="isAutoFun">轉(zhuǎn)動車</button> <button @click="stop">停止</button> <div class="flex"> <div @click="setCarColor(index)" v-for="(item,index) in colorAry" :style="{backgroundColor : item}"></div> </div> </div> </div> </template> <script setup> import {onMounted, reactive, ref, toRefs} from 'vue' import { Color, DirectionalLight, DirectionalLightHelper, HemisphereLight, HemisphereLightHelper, PerspectiveCamera, Scene, WebGLRenderer } from 'three' import {OrbitControls} from 'three/examples/jsm/controls/OrbitControls.js' import {GLTFLoader} from 'three/examples/jsm/loaders/GLTFLoader' //車身顏色數(shù)組 const colorAry = [ "rgb(216, 27, 67)", "rgb(142, 36, 170)", "rgb(81, 45, 168)", "rgb(48, 63, 159)", "rgb(30, 136, 229)", "rgb(0, 137, 123)", "rgb(67, 160, 71)", "rgb(251, 192, 45)", "rgb(245, 124, 0)", "rgb(230, 74, 25)", "rgb(233, 30, 78)", "rgb(156, 39, 176)", "rgb(0, 0, 0)"] // 車身顏色數(shù)組 const loader = new GLTFLoader() //引入模型的loader實(shí)例 const defaultMap = { x: 510, y: 128, z: 0, }// 相機(jī)的默認(rèn)坐標(biāo) const map = reactive(defaultMap)//把相機(jī)坐標(biāo)設(shè)置成可觀察對象 const {x, y, z} = toRefs(map)//輸出坐標(biāo)給模板使用 let scene, camera, renderer, controls, floor, dhelper, hHelper, directionalLight, hemisphereLight // 定義所有three實(shí)例變量 let isLoading = ref(true) //是否顯示loading 這個load模型監(jiān)聽的進(jìn)度 let loadingWidth = ref(0)// loading的進(jìn)度 //創(chuàng)建燈光 const setLight = () => { directionalLight = new DirectionalLight(0xffffff, 0.5) directionalLight.position.set(-4, 8, 4) dhelper = new DirectionalLightHelper(directionalLight, 5, 0xff0000) hemisphereLight = new HemisphereLight(0xffffff, 0xffffff, 0.4) hemisphereLight.position.set(0, 8, 0) hHelper = new HemisphereLightHelper(hemisphereLight, 5) scene.add(directionalLight) scene.add(hemisphereLight) } // 創(chuàng)建場景 const setScene = () => { scene = new Scene() renderer = new WebGLRenderer() renderer.setSize(innerWidth, innerHeight) document.querySelector('.boxs').appendChild(renderer.domElement) } // 創(chuàng)建相機(jī) const setCamera = () => { const {x, y, z} = defaultMap camera = new PerspectiveCamera(60, innerWidth / innerHeight, 1, 1000) camera.position.set(x, y, z) } // 設(shè)置模型控制 const setControls = () => { controls = new OrbitControls(camera, renderer.domElement) controls.maxPolarAngle = 0.9 * Math.PI / 2 controls.enableZoom = true controls.addEventListener('change', render) } //返回坐標(biāo)信息 const render = () => { map.x = Number.parseInt(camera.position.x) map.y = Number.parseInt(camera.position.y) map.z = Number.parseInt(camera.position.z) } // 循環(huán)場景 、相機(jī)、 位置更新 const loop = () => { requestAnimationFrame(loop) renderer.render(scene, camera) controls.update() } //是否自動轉(zhuǎn)動 const isAutoFun = () => { controls.autoRotate = true } //停止轉(zhuǎn)動 const stop = () => { controls.autoRotate = false } //設(shè)置車身顏色 const setCarColor = (index) => { const currentColor = new Color(colorAry[index]) scene.traverse(child => { if (child.isMesh) { console.log(child.name) if (child.name.includes('door_')) { child.material.color.set(currentColor) } } }) } const loadFile = (url) => { return new Promise(((resolve, reject) => { loader.load(url, (gltf) => { resolve(gltf) }, ({loaded, total}) => { let load = Math.abs(loaded / total * 100) loadingWidth.value = load if (load >= 100) { setTimeout(() => { isLoading.value = false }, 1000) } console.log((loaded / total * 100) + '% loaded') }, (err) => { reject(err) } ) })) } //初始化所有函數(shù) const init = async () => { setScene() setCamera() setLight() setControls() const gltf = await loadFile('src/assets/3d/tesla_2018_model_3/scene.gltf') scene.add(gltf.scene) loop() } //用vue鉤子函數(shù)調(diào)用 onMounted(init) </script> <style> body { margin: 0; } .maskLoading { background: #000; position: fixed; display: flex; justify-content: center; align-items: center; top: 0; left: 0; bottom: 0; right: 0; z-index: 1111111; color: #fff; } .maskLoading .loading { width: 400px; height: 20px; border: 1px solid #fff; background: #000; overflow: hidden; border-radius: 10px; } .maskLoading .loading div { background: #fff; height: 20px; width: 0; transition-duration: 500ms; transition-timing-function: ease-in; } canvas { width: 100%; height: 100%; margin: auto; } .mask { color: #fff; position: absolute; bottom: 0; left: 0; width: 100%; } .flex { display: flex; flex-wrap: wrap; padding: 20px; } .flex div { width: 10px; height: 10px; margin: 5px; cursor: pointer; } </style>

最后

在這個3D汽車展示廳筆者只是簡單創(chuàng)建了一些基礎(chǔ)功能，還有很多功能可以增加，比如創(chuàng)建背景、地板、一些陰影、定點(diǎn)顯示車套件位置信息等等。掌握套路,這些功能實(shí)現(xiàn)也不難。另外筆者要沖二級啦，希望大家如果喜歡能給小弟點(diǎn)個贊，謝謝啦 ^_^

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網(wǎng)址: 用最簡單方式打造Three.js 3D汽車展示廳在上一篇文章簡單粗略的描述了開發(fā)3D汽車展廳，筆者再寫一篇比較詳細(xì)的教程 http://m.u1s5d6.cn/newsview536863.html