网址（加载三维模型gltf）:1. 建模软件绘制3D场景(Blender) | Three.js中文网

• 引入

  <template>
    <div id="webgl"></div>
  </template>
  
  <script lang="ts" setup>
  import { onMounted, onUnmounted } from "vue";
  import * as THREE from "three";
  import { GLTFLoader } from "three/examples/jsm/loaders/GLTFLoader";//加载器
  import { OrbitControls } from "three/examples/jsm/controls/OrbitControls";//鼠标控制器
  import { RoomEnvironment } from "three/examples/jsm/environments/RoomEnvironment";//材质
  </script>
  

• 渲染

  let animateId: any = null;
  onMounted(() => {
    // 创建场景
    const scene = new THREE.Scene();
    // const url = "/preview.glb"; //本地,public下路径文件地址
    const url = `/api/preview/model/${directoryId}/${id}`;//获取glb文件接口地址
    scene.background = new THREE.Color(0xfffffff);//场景背景色
  
    // 创建相机
    const camera = new THREE.PerspectiveCamera(60, window.innerWidth / window.innerHeight, 1, 100);
    camera.position.set(2, 2, 2);
    camera.lookAt(scene.position);
  
  
    // 创建默认光源
    // const directionalLight = new THREE.DirectionalLight(0xbbbbbb, 1); // 平行光，参数1为强度
    // directionalLight.position.set(1, 1, 1); // 光源位置
    // scene.add(directionalLight); // 将光源添加到场景
    // 添加环境光
    // const ambientLight = new THREE.AmbientLight(0xffffff, 0.9);
    // scene.add(ambientLight);
  
    // 创建渲染器
    const renderer = new THREE.WebGLRenderer();
    renderer.setSize(700, 420);
    document.body.appendChild(renderer.domElement);
  
  
    // 控制器
    let control = new OrbitControls(camera, renderer.domElement);
    control.target.set(0, 0, 0);
  
    // 地表格
    // const grid = new THREE.GridHelper(500, 100, 0xffffff, 0xffffff);
    // grid.material.opacity = 0.5;
    // grid.material.depthWrite = false;
    // grid.material.transparent = true;
    // scene.add(grid);
  
    // 材质
    const environment = new RoomEnvironment();
    const pmremGenerator = new THREE.PMREMGenerator(renderer);
    scene.environment = pmremGenerator.fromScene(environment).texture;
  
    // 加载 glb 格式的 3D 模型
    const loader = new GLTFLoader();
    loader.load(
      url,
      (gltf: any) => {
        // 加载成功后的回调函数
        const model = gltf.scene;
        // model.scale.set(0.8, 0.8, 0.8); // 缩小模型
        const box = new THREE.Box3().setFromObject(model);
        const center = box.getCenter(new THREE.Vector3());
        model.position.sub(center); // 将模型位置移到原点处
        scene.add(model);
      },
      (xhr: any) => {
        // 加载过程中的回调函数
        console.log((xhr.loaded / xhr.total) * 100 + "% loaded");
      },
      (error: any) => {
        // 加载失败的回调函数
        console.error("Failed to load model", error);
      }
    );
  
    // 渲染场景
    const animate = () => {
      //动画帧
      animateId = requestAnimationFrame(animate);
      renderer.render(scene, camera);
    };
    animate();
  });

• 销毁，组件销毁清除渲染动画，减少不必要的调用

  // 销毁场景
  onUnmounted(() => {
    cancelAnimationFrame(animateId);
  });