vue中加载GLB模型，计算模型的长宽高、绘制模型的边框线

项目环境版本

• vue：2.6.12
• threejs: 0.169.0
• node: 16.20.0

需求背景

• 主页面点击预览按钮，默认显示弹框，并且加载GLB模型文件
• 点击弹框中的功能按钮，计算GLB模型的长宽高
• 点击弹框中的功能按钮，绘制GLB模型的边框线(长方体空间)

效果预览

实现步骤

1.引入threejs

npm install three --save

2.创建2个Vue组件：

• Preview.vue：预览弹框
• LoadGlb.vue：加载Glb模型文件

3.预览弹框功能（详情见代码注释，只写关键部分）

<template><div><div class="top-btn"><div class="sizeInfo"><template v-if="showExtraModelInfo"><div><span>长：</span>{{ glbSize.x }}m</div><div><span>宽：</span>{{ glbSize.y }}m</div><div><span>高：</span>{{ glbSize.z }}m</div></template></div><img class="pointer" src="@/assets/images/category.png" alt="" @click="toggleShowExtraInfo"></div><!--    加载Glb模型      --><load-glb ref="glbRef" @getSize="getSize" :glb-url="detailInfo.modelGlbPath" v-if="open" /></div>
<template><script>
import LoadGlb from "./LoadGlb.vue";
export default {components: {LoadGlb},data() {glbSize: {}, // 模型的长宽高showExtraModelInfo: false, // 是否显示额外的模型信息，默认不显示open: false,},methods: {// 获取模型的长宽高getSize(e) {this.glbSize = e},// 切换显示额外的模型信息toggleShowExtraInfo() {this.showExtraModelInfo = !this.showExtraModelInfothis.$refs.glbRef.toggleShowOuterLine(this.showExtraModelInfo)}}
}
</script>

4.加载Glb组件（详情见代码注释）

<template><div ref="threeJsContainer" class="three-js-container"></div>
</template><script>
import * as THREE from 'three';
import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader';
// 引入轨道控制器扩展库OrbitControls.js
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls.js';export default {props: {// glb模型的网络地址glbUrl: {type: String,required: true}},data() {return {scene: null,camera: null,renderer: null,glbModel: null,outerLine: null, // 外侧边框线，长方体};},mounted() {this.$nextTick(() => {this.initThree();})},methods: {initThree() {// 创建场景this.scene = new THREE.Scene();this.scene.background = new THREE.Color(0xeeeeee);const width = 360; //宽度const height = 360; //高度// 创建灯光const ambientLight = new THREE.AmbientLight(0xffffff, 1);this.scene.add(ambientLight);const directionalLight = new THREE.DirectionalLight(0xffffff, 1);directionalLight.position.set(1, 1, 1);this.scene.add(directionalLight);// 创建相机this.camera = new THREE.PerspectiveCamera(45, width / height, 1, 3000);// 创建渲染器this.renderer = new THREE.WebGLRenderer();this.renderer.setSize(width, height);// 加载GLB模型this.loadGLBModel();this.$refs.threeJsContainer.appendChild(this.renderer.domElement);// 设置相机控件轨道控制器OrbitControlsconst controls = new OrbitControls(this.camera, this.renderer.domElement);// 如果OrbitControls改变了相机参数，重新调用渲染器渲染三维场景controls.addEventListener('change', () => {this.renderer.render(this.scene, this.camera); //执行渲染操作});//监听鼠标、键盘事件},// 加载GLB模型loadGLBModel() {const loader = new GLTFLoader();loader.load(this.glbUrl, (gltf) => {this.glbModel = gltf.scene;const box = new THREE.Box3().setFromObject(gltf.scene);// 计算glb的长宽高const glbSize = {x: Number((box.max.x - box.min.x).toFixed(2)),y: Number((box.max.y - box.min.y).toFixed(2)),z: Number((box.max.z - box.min.z).toFixed(2))}// 绘制边框线，默认不显示this.drawBorder(box.min, box.max)this.$emit('getSize', glbSize)this.scene.add(this.glbModel);// 动态计算相机位置，保持中心始终看到大小相同的模型，todo: 待优化const { x, y, z } = glbSizeconsole.log('glbSize', glbSize)this.camera.position.set(-x * 1.8, y * 1.4, z * 2);this.camera.lookAt(0, 0, 0);this.animate(this.renderer, this.scene, this.camera);});},// 画模型的边框线drawBorder(min, max) {// 定义长方体的8个顶点坐标const vertices = new Float32Array([// 顶面四个顶点min.x, max.y, min.z, // 0max.x, max.y, min.z,  // 1max.x, max.y, max.z,   // 2min.x, max.y, max.z,  // 3// 底面四个顶点min.x, min.y, min.z, // 4max.x, min.y, min.z,  // 5max.x, min.y, max.z,   // 6min.x, min.y, max.z   // 7]);// 定义顶点索引，用于构成长方体的12条边const indices = new Uint16Array([0, 1, 1, 2, 2, 3, 3, 0, // 顶面边4, 5, 5, 6, 6, 7, 7, 4, // 底面边0, 4, 1, 5, 2, 6, 3, 7  // 竖直边]);// 创建一个BufferGeometryconst geometry = new THREE.BufferGeometry();geometry.setAttribute('position', new THREE.BufferAttribute(vertices, 3));geometry.setIndex(new THREE.BufferAttribute(indices, 1));// 创建一个材质const material = new THREE.LineBasicMaterial({ color: 0xfdaf58 });// 创建线段this.outerLine = new THREE.LineSegments(geometry, material);// 初始隐藏，点击那个玩意的时候再显示this.outerLine.visible = false;// 将线段添加到场景中this.scene.add(this.outerLine);},animate(renderer, scene, camera) {requestAnimationFrame(() => this.animate(renderer, scene, camera));renderer.render(scene, camera);},// 显示隐藏边框线toggleShowOuterLine(flag) {this.outerLine.visible = flag;}},
};
</script><style scoped>
.three-js-container {width: 360px;height: 360px;
}
</style>