facet normal nx ny nz
  outer loop
    vertex x1 y1 z1
    vertex x2 y2 z2
    vertex x3 y3 z3
  endloop
endfacet

// 引入three.js庫和STLLoader
import * as THREE from 'three';
import { STLLoader } from 'three/examples/jsm/loaders/STLLoader.js';

// 創(chuàng)建場景、相機(jī)和渲染器
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);

// 設(shè)置相機(jī)位置
camera.position.z = 5;

// 加載STL文件
const loader = new STLLoader();
loader.load('models/your-model.stl', function (geometry) {
    const material = new THREE.MeshStandardMaterial({ color: 0x00ff00 });
    const mesh = new THREE.Mesh(geometry, material);
    
    // 可選：調(diào)整模型大小
    mesh.scale.set(0.01, 0.01, 0.01);
    
    // 添加到場景
    scene.add(mesh);
    
    // 動畫循環(huán)
    function animate() {
        requestAnimationFrame(animate);
        
        // 可選：添加一些基本動畫
        mesh.rotation.x += 0.01;
        mesh.rotation.y += 0.01;
        
        renderer.render(scene, camera);
    }
    animate();
}, undefined, function (error) {
    console.error('An error happened during loading:', error);
});

// 處理窗口大小變化
window.addEventListener('resize', () => {
    camera.aspect = window.innerWidth / window.innerHeight;
    camera.updateProjectionMatrix();
    renderer.setSize(window.innerWidth, window.innerHeight);
});

// 引入three.js庫和STLExporter
import * as THREE from 'three';
import { STLExporter } from 'three/examples/jsm/exporters/STLExporter.js';

// 假設(shè)你有一個已經(jīng)存在的網(wǎng)格對象 `mesh`
const exporter = new STLExporter();

// 導(dǎo)出為ASCII格式
function exportMeshToSTL(mesh) {
    const stlContent = exporter.parse(mesh, { binary: false });

    // 創(chuàng)建一個Blob對象
    const blob = new Blob([stlContent], { type: 'text/plain' });

    // 創(chuàng)建下載鏈接
    const link = document.createElement('a');
    link.href = URL.createObjectURL(blob);
    link.download = 'exported_model.stl';
    link.click();
}

// 調(diào)用函數(shù)導(dǎo)出網(wǎng)格
exportMeshToSTL(mesh);

// 如果你想導(dǎo)出為二進(jìn)制格式，只需將 `binary` 參數(shù)設(shè)置為 `true`
function exportMeshToBinarySTL(mesh) {
    const stlContent = exporter.parse(mesh, { binary: true });

    // 創(chuàng)建一個Blob對象
    const blob = new Blob([stlContent], { type: 'application/octet-stream' });

    // 創(chuàng)建下載鏈接
    const link = document.createElement('a');
    link.href = URL.createObjectURL(blob);
    link.download = 'exported_model_binary.stl';
    link.click();
}

// 調(diào)用函數(shù)導(dǎo)出二進(jìn)制格式的網(wǎng)格
exportMeshToBinarySTL(mesh);