JavaScript 加载与导出 3MF 文件完整指南

npm install three 3mf-js

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Load 3MF File with 3mf-js</title>
  <style>
    body { margin: 0; }
    canvas { display: block; }
  </style>
</head>
<body>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.min.js"></script>
  <script src="node_modules/3mf-js/dist/3mf.min.js"></script>
  <script>
    async function load3MF(url) {
      const response = await fetch(url);
      const arrayBuffer = await response.arrayBuffer();
      const model = new ThreeMF.Model();
      await model.load(arrayBuffer);

      return model;
    }

    async function init() {
      const model = await load3MF('path/to/your/model.3mf');

      console.log('Model loaded:', model);

      // 在这里可以处理模型数据，例如将其转换为 Three.js 的几何数据
      const scene = new THREE.Scene();
      const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
      const renderer = new THREE.WebGLRenderer();
      renderer.setSize(window.innerWidth, window.innerHeight);
      document.body.appendChild(renderer.domElement);

      // 示例：将第一个对象转换为 Three.js 的几何数据
      if (model.resources && model.resources.length > 0) {
        const resource = model.resources[0];
        if (resource.mesh) {
          const geometry = new THREE.Geometry();
          resource.mesh.vertices.forEach(vertex => {
            geometry.vertices.push(new THREE.Vector3(vertex.x, vertex.y, vertex.z));
          });

          resource.mesh.triangles.forEach(triangle => {
            geometry.faces.push(new THREE.Face3(triangle.v1, triangle.v2, triangle.v3));
          });

          geometry.computeVertexNormals();
          geometry.computeFaceNormals();

          const material = new THREE.MeshLambertMaterial({ color: 0x00ff00 });
          const mesh = new THREE.Mesh(geometry, material);
          scene.add(mesh);
        }
      }

      const light = new THREE.DirectionalLight(0xffffff, 1);
      light.position.set(10, 10, 10).normalize();
      scene.add(light);

      function animate() {
        requestAnimationFrame(animate);
        renderer.render(scene, camera);
      }

      animate();
    }

    init();
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Export 3MF File with 3mf-js</title>
  <style>
    body { margin: 0; }
  </style>
</head>
<body>
  <button id="exportButton">导出 3MF 文件</button>
  <script src="node_modules/3mf-js/dist/3mf.min.js"></script>
  <script>
    document.getElementById('exportButton').addEventListener('click', async () => {
      // 创建一个新的模型
      const model = new ThreeMF.Model();

      // 创建一个几何体
      const geometry = new ThreeMF.Geometry();
      geometry.vertices = [
        new ThreeMF.Vector3(0, 0, 0),
        new ThreeMF.Vector3(1, 0, 0),
        new ThreeMF.Vector3(0, 1, 0),
        new ThreeMF.Vector3(0, 0, 1)
      ];
      geometry.triangles = [
        new ThreeMF.Triangle(0, 1, 2),
        new ThreeMF.Triangle(0, 2, 3),
        new ThreeMF.Triangle(0, 3, 1),
        new ThreeMF.Triangle(1, 3, 2)
      ];

      // 添加几何体到资源列表
      const resource = model.addResource(geometry);

      // 创建一个对象并引用几何体
      const object = model.addObject(resource.id);
      object.transform = new ThreeMF.Transform(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0);

      // 将模型写入 ArrayBuffer
      const arrayBuffer = await model.save();

      // 创建一个 Blob 对象
      const blob = new Blob([arrayBuffer], { type: 'application/vnd.ms-package.3dmanufacturing-3dmodel+xml' });

      // 创建一个下载链接
      const url = URL.createObjectURL(blob);
      const a = document.createElement('a');
      a.href = url;
      a.download = 'model.3mf';
      a.click();

      // 释放 URL 对象
      URL.revokeObjectURL(url);
    });
  </script>
</body>
</html>