一、前言

1.本文将介绍如何使用mxcad3d来创建建筑墙体模型。该工具提供了丰富的三维建模功能和便捷的API，首先通过npm包管理器来新建测试项目并引入mxcad包，所以需要先安装Node.js，里面自带了npm包管理器以及包含在npm包管理器中的npx工具 (用于启动运行我们的测试项目)，Node.js下载和安装教程。

二、新建测试项目

1.在合适的位置创建本次教程的测试项目文件夹Test3dWall ，并在Test3dWall 文件夹中打开cmd命令行工具，依次输入以下指令来初始化项目并引入mxcad包。新建项目的方法也可以在官方的快速入门文档中找到，依次输入以下操作命令，如下图：

npm init -y
npm install vite -D
npm install mxcad@latest

2. 使用VS CODE打开新建的测试项目文件夹，如下图：

3.打开项目后，在项目目录下新建一个index.html文件以及一个src目录，然后在src目录下新建一个index.ts文件并编写最基本的代码：

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>vite use mxcad</title>
</head>
<body>
    <div style="height: 800px; overflow: hidden;"> <canvas id="myCanvas"></canvas></div>
    <script type="module" src="./src/index.ts"></script>
</body>
</html>

src/index.ts

import { MxCAD3DObject } from "mxcad"
// 创建mxcad3d对象
const mxcad3d = new MxCAD3DObject()
// 初始化mxcad3d对象
mxcad3d.create({
    // canvas元素的css选择器字符串（示例中是id选择器），或canvas元素对象
    canvas: "#myCanvas",
    // 获取加载wasm相关文件(wasm/js/worker.js)路径位置
    locateFile: (fileName)=> new URL(`/node_modules/mxcad/dist/wasm/3d/${fileName}`, import.meta.url).href,
})
// 初始化完成
mxcad3d.on("init", ()=>{
    console.log("初始化完成");
});

三、运行测试

1.新建终端

2.开启服务

3.打开网页，查看效果

四、编写绘制建筑墙体的代码

1.墙体的二维平面设计图：

2.index.html中添加一个按钮(以下是index.html完整代码)

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>vite use mxcad</title>
</head>
<body>
    <div style="height: 800px; overflow: hidden;"> <canvas id="myCanvas"></canvas></div>
    <script type="module" src="./src/index.ts"></script>
    <button>绘制建筑墙体</button>
</body>
</html>

3.src/index.ts中添加绘制墙体的代码，给按钮添加点击事件来触发绘制墙体的代码执行，以下是src/index.ts完整代码：

import { MxCAD3DObject, Mx3dGePoint, Mx3dMkPolygon, Mx3dMkFace, Mx3dMkPrism, Mx3dGeVec, Mx3dGeColor, MdGe } from "mxcad"
// 创建mxcad3d对象
const mxcad3d = new MxCAD3DObject()
// 初始化mxcad3d对象
mxcad3d.create({
 // canvas元素的css选择器字符串（示例中是id选择器），或canvas元素对象
 canvas: "#myCanvas",
 // 获取加载wasm相关文件(wasm/js/worker.js)路径位置
 locateFile: (fileName)=> new URL(`/node_modules/mxcad/dist/wasm/3d/${fileName}`, import.meta.url).href,
})
// 初始化完成
mxcad3d.on("init", ()=>{
 console.log("初始化完成");
});
function funDrawWall(){
 // 外墙轮廓
 const wallOutterPts: Mx3dGePoint[] = [];
 wallOutterPts.push(new Mx3dGePoint(0, 0, 0));
 wallOutterPts.push(new Mx3dGePoint(0, 4480, 0));
 wallOutterPts.push(new Mx3dGePoint(5480, 4480, 0));
 wallOutterPts.push(new Mx3dGePoint(5480, 0, 0));
 const wallOutterPolygon = new Mx3dMkPolygon();
 wallOutterPts.forEach((pt) => {
 wallOutterPolygon.Add(pt);
 });
 wallOutterPolygon.Close();
 const wallOutterWire = wallOutterPolygon.Wire();
 const wallOutterMkFace = new Mx3dMkFace(wallOutterWire);
 const wallOutterFace = wallOutterMkFace.Face();
 // 内墙轮廓
 const wallInnerPts: Mx3dGePoint[] = [];
 wallInnerPts.push(new Mx3dGePoint(240, 240, 0));
 wallInnerPts.push(new Mx3dGePoint(240, 4240, 0));
 wallInnerPts.push(new Mx3dGePoint(5240, 4240, 0));
 wallInnerPts.push(new Mx3dGePoint(5240, 240, 0));
 const wallInnerPolygon = new Mx3dMkPolygon();
 wallInnerPts.forEach((pt) => {
 wallInnerPolygon.Add(pt);
 });
 wallInnerPolygon.Close();
 const wallInnerWire = wallInnerPolygon.Wire();
 const wallInnerMkFace = new Mx3dMkFace(wallInnerWire);
 const wallInnerFace = wallInnerMkFace.Face();
 // 墙体截面
 const wallFace = wallOutterFace.cut(wallInnerFace);
 // 拉伸墙体
 const wallMkPrism = new Mx3dMkPrism(wallFace, new Mx3dGeVec(0, 0, 3000));
 let wall = wallMkPrism.Shape();
 // 开窗洞
 const winPts: Mx3dGePoint[] = [];
 winPts.push(new Mx3dGePoint(1990, 4240, 1000));
 winPts.push(new Mx3dGePoint(1990, 4240, 2200));
 winPts.push(new Mx3dGePoint(3490, 4240, 2200));
 winPts.push(new Mx3dGePoint(3490, 4240, 1000));
 const winPolygon = new Mx3dMkPolygon();
 winPts.forEach((pt) => {
 winPolygon.Add(pt);
 });
 winPolygon.Close();
 const winWire = winPolygon.Wire();
 const winMkFace = new Mx3dMkFace(winWire);
 const winFace = winMkFace.Face();
 const winMkPrism = new Mx3dMkPrism(winFace, new Mx3dGeVec(0, 240, 0));
 const win = winMkPrism.Shape();
 // 开门洞
 const doorPts: Mx3dGePoint[] = [];
 doorPts.push(new Mx3dGePoint(5240, 1160, 0));
 doorPts.push(new Mx3dGePoint(5240, 1160, 2000));
 doorPts.push(new Mx3dGePoint(5240, 360, 2000));
 doorPts.push(new Mx3dGePoint(5240, 360, 0));
 const doorPolygon = new Mx3dMkPolygon();
 doorPts.forEach((pt) => {
 doorPolygon.Add(pt);
 });
 doorPolygon.Close();
 const doorWire = doorPolygon.Wire();
 const doorMkFace = new Mx3dMkFace(doorWire);
 const doorFace = doorMkFace.Face();
 const doorMkPrism = new Mx3dMkPrism(doorFace, new Mx3dGeVec(240, 0, 0));
 const door = doorMkPrism.Shape();
 wall = wall.cut(win).cut(door);
 // 准备一个棕色
 const brownColor = new Mx3dGeColor(MdGe.MxNameOfColor.Color_NOC_BROWN);
 // 先清除视图中的模型
 mxcad3d.removeAll();
 // 获取视图文档
 const doc = mxcad3d.getDocument();
 // 文档中创建一个标签用于存储墙体形状
 const wallLabel = doc.addShapeLabel();
 // 墙体形状放入文档标签中
 wallLabel.setShape(wall);
 // 给墙体设置为棕色
 wallLabel.setColor(brownColor);
 // 更新显示视图
 mxcad3d.update();
}
// 给button添加点击事件，点击后调用drawRoundRectPipe函数，进行圆角方管的绘制
// 立即执行函数
(function addEventToButton(){
 const btn = document.querySelector("button");
 if (btn) {
 btn.addEventListener("click", () => {
 funDrawWall();
 });
 }
})()

4. 重新查看运行效果：

5. 压缩包下载解压后需要在项目目录下打开cmd命令行，然后在命令行中执行npm install来安装依赖，然后再按照本教程中的方式来运行项目查看效果。

前军教程网

中小站长与DIV+CSS网页布局开发技术人员的首选CSS学习平台

(在线预览STEP图纸)网页CAD中创建三维建筑墙体

一、前言

二、新建测试项目

三、运行测试

四、编写绘制建筑墙体的代码