Use vue to learn three.js to load advanced geometry-load COLLADA (.dae) format model

1.demo effect

As shown above, the demo loads the COLLADA format model through ColladaLoader and presents the truck on the page

2. Implementation points

2.1 COLLADA model placement path

When loading files in vue, the default path is public, so the files that need to be loaded are placed in this path, and the variable publicPath is created in the data attribute of vue. The value of this variable is the environment variable process.env.BASE_URL in vue

data() {
    
    
  return {
    
    
    publicPath: process.env.BASE_URL
  }
}

2.2 Load COLLADA model

Here we import the model through ColladaLoader, but here we need to pay attention to the import path, splicing the publicpath variable we created to the file path, in the imported callback function, clone the group object in the loading result, and add the group object to The scenario is as follows:

// 加载Collada模型
loadCollada() {
    
    
  const THIS = this
  const loader = new ColladaLoader()
  loader.load(`${
      
      THIS.publicPath}models/dae/Truck_dae.dae`, LoadResult => {
    
    
    this.mesh = LoadResult.scene.children[0].clone()
    this.mesh.scale.set(2, 2, 2)
    this.scene.add(this.mesh)
  })
}

3.demo code

<template>
  <div>
    <div id="container"></div>
  </div>
</template>

<script>
import * as THREE from 'three'
import {
    
     OrbitControls } from 'three/examples/jsm/controls/OrbitControls.js'
import {
    
     ColladaLoader } from 'three/examples/jsm/loaders/ColladaLoader.js'

export default {
    
    
  data() {
    
    
    return {
    
    
      publicPath: process.env.BASE_URL,
      mesh: null,
      camera: null,
      scene: null,
      renderer: null,
      controls: null
    }
  },
  mounted() {
    
    
    this.init()
  },
  methods: {
    
    
    // 初始化
    init() {
    
    
      this.createScene() // 创建场景
      this.loadCollada() // 加载Collada模型
      this.createLight() // 创建光源
      this.createCamera() // 创建相机
      this.createRender() // 创建渲染器
      this.createControls() // 创建控件对象
      this.render() // 渲染
    },
    // 创建场景
    createScene() {
    
    
      this.scene = new THREE.Scene()
    },
    // 加载Collada模型
    loadCollada() {
    
    
      const THIS = this
      const loader = new ColladaLoader()
      loader.load(`${
      
      THIS.publicPath}models/dae/Truck_dae.dae`, LoadResult => {
    
    
        this.mesh = LoadResult.scene.children[0].clone()
        this.mesh.scale.set(2, 2, 2)
        this.scene.add(this.mesh)
      })
    },

    // 创建光源
    createLight() {
    
    
      // 环境光
      const ambientLight = new THREE.AmbientLight(0xffffff, 0.1) // 创建环境光
      this.scene.add(ambientLight) // 将环境光添加到场景

      const spotLight = new THREE.SpotLight(0xffffff) // 创建聚光灯
      spotLight.position.set(150, 150, 150)
      spotLight.intensity = 2
      this.scene.add(spotLight)
    },
    // 创建相机
    createCamera() {
    
    
      const element = document.getElementById('container')
      const width = element.clientWidth // 窗口宽度
      const height = element.clientHeight // 窗口高度
      const k = width / height // 窗口宽高比
      // PerspectiveCamera( fov, aspect, near, far )
      this.camera = new THREE.PerspectiveCamera(35, k, 0.1, 1000)
      this.camera.position.set(250, 250, 150) // 设置相机位置
      this.camera.lookAt(new THREE.Vector3(10, 40, 0)) // 设置相机方向
      this.scene.add(this.camera)
    },
    // 创建渲染器
    createRender() {
    
    
      const element = document.getElementById('container')
      this.renderer = new THREE.WebGLRenderer({
    
     antialias: true, alpha: true })
      this.renderer.setSize(element.clientWidth, element.clientHeight) // 设置渲染区域尺寸
      this.renderer.shadowMap.enabled = true // 显示阴影
      this.renderer.shadowMap.type = THREE.PCFSoftShadowMap
      this.renderer.setClearColor(0x3f3f3f, 1) // 设置背景颜色
      element.appendChild(this.renderer.domElement)
    },

    render() {
    
    
      this.renderer.render(this.scene, this.camera)
      requestAnimationFrame(this.render)
    },
    // 创建控件对象
    createControls() {
    
    
      this.controls = new OrbitControls(this.camera, this.renderer.domElement)
    }
  }
}
</script>
<style>
#container {
    
    
  position: absolute;
  width: 100%;
  height: 100%;
}
</style>