maptalks+three.js+vue webpack实现二维地图上贴三维模型操作

网络编程 2024/11/1 佚名

3 2 1

我们不是走在坑里就是走在前往坑的路上_(:зゝ∠)_

最终效果如图：（地图上添加一个“三维地图”的toolbar按钮，点击后在二维地图上贴上建好的三维模型点击显示弹框）

以下都在已经引入并且初始化maptalks地图的基础上，如何引入使用maptalks可以查看以下文章

https://www.jb51.net/article/192983.htm

1、安装maptalks.three包

npm install maptalks.three

2、安装three包

npm install three

3、安装obj-loader和mtl-loader包

npm i --save three-obj-mtl-loader

4、引入model模型文件到public下（放在这里是因为打包后读取路径问题，目前发现放在这里才能在打包后正确读取）

5、Vue页面代码

引入包

import * as THREE from 'three'
import * as maptalks from 'maptalks'
import { ThreeLayer } from 'maptalks.three'
import { MTLLoader, OBJLoader } from 'three-obj-mtl-loader'

初始化的地图对象是

this.map

下面是渲染三维模型的方法

// 渲染三维
draw3D() {
 const that = this
 // 三维地图
 var three_flag = false
 // ///单体化交互开始
 var INTERSECTED
 this.map.on('click', function(e) {
  //  console.log(e)
  var raycaster = new THREE.Raycaster()
  var mouse = new THREE.Vector2()
  const camera = threeLayer.getCamera()
  const scene = threeLayer.getScene()
  if (!scene) return
 
  const size = that.map.getSize()
  const width = size.width; const height = size.height
  mouse.x = (e.containerPoint.x / width) * 2 - 1
  mouse.y = -((e.containerPoint.y) / height) * 2 + 1
 
  raycaster.setFromCamera(mouse, camera)
  raycaster.linePrecision = 3
 
  var intersects = raycaster.intersectObjects(scene.children, true)
  // var intersects = raycaster.intersectObject(points);
  if (!intersects) return
  if (Array.isArray(intersects) && intersects.length === 0) return
  console.log(intersects)
  // 这里我们操作第一个相交的物体
  if (intersects.length > 0) {
   if (INTERSECTED != intersects[0].object) {
    if (INTERSECTED) {
     // INTERSECTED.material.color.setHex(INTERSECTED.currentHex);
     // INTERSECTED.scale.set(1,1,1);
     if (INTERSECTED.material.length === undefined) {
      INTERSECTED.material.color.setHex(INTERSECTED.currentHex)
     } else {
      for (var i = 0; i < INTERSECTED.material.length; i++) {
       INTERSECTED.material[i].color.setHex(INTERSECTED.currentHex)
      }
     }
    }
    INTERSECTED = intersects[0].object
 
    // 设置相交的第一个物体的颜色
    // INTERSECTED.currentHex = INTERSECTED.material[0].color.getHex();
    INTERSECTED.currentHex = 16777215
    // 将该物体设为随机的其他颜色
    // INTERSECTED.material.opacity = 0.2;
 
    // INTERSECTED.material.transparent = true;
    // INTERSECTED.material.opacity = 0.2;
    // INTERSECTED.material.needsUpdate = true;
    // INTERSECTED.material.transparent = false;
 
    // INTERSECTED.material.color.setHex(0xff0000);
    if (INTERSECTED.material.length === undefined) {
     INTERSECTED.material.color.setHex(0x1E90FF)
    } else {
     for (var i = 0; i < INTERSECTED.material.length; i++) {
      INTERSECTED.material[i].color.setHex(0x1E90FF)
     }
    }
   }
   // //////////////
   var lonlat = e.coordinate
   if (true) {
    var options = {
     'autoOpenOn': 'null', // set to null if not to open window when clicking on map
     'single': true,
     'width': 410,
     'height': 190,
     'custom': true,
     'autoCloseOn': 'click',
     'dy': -316,
     'content': '<div class="content build-content">' +
      '<div class="pop-img"><img src="/UploadFiles/2021-04-02/1544760152593.jpg">

上面这段代码需要注意的是模型数据文件的读取路径


// 相对路径参数,
var mtlPath = process.env.BASE_URL + 'model/obj/'
var mtlName = '3d_puruan_new.mtl'
var objPath = process.env.BASE_URL + 'model/obj/'
var objName = '3d_puruan3.obj'



关于process.env.BASE_URL的值可以在vue.config.js里自定义设置（cli3.0）

baseUrl: process.env.NODE_ENV === 'production' "color: #ff0000">补充知识：Vue npm安装Vue常用依赖，axios、element ui、mockjs
添加axios依赖：

npm install axios

添加element-ui：

npm i element-ui -S

添加 mockjs：

npm install mockjs

以上这篇maptalks+three.js+vue webpack实现二维地图上贴三维模型操作就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。