在UniApp中使用Three.js渲染3D模型

<template>
  <view class="container">
    <canvas canvas-id="canvas" style="width: 100%; height: 100%"></canvas>
  </view>
</template>
 
<script>
  import * as THREE from 'three';
  import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader.js';
 
  export default {
    data() {
      return {
        camera: null,
        scene: null,
        renderer: null,
        model: null
      }
    },
    onReady() {
      this.initThree();
      this.addLights();
      this.addCamera();
      this.loadModel();
      this.animate();
    },
    methods: {
      initThree() {
        this.scene = new THREE.Scene();
        this.renderer = new THREE.WebGLRenderer({ antialias: true });
        this.renderer.setSize(uni.upx2px(750), uni.upx2px(750));
        uni.createSelectorQuery()
          .select('#canvas')
          .node()
          .then(res => {
            res.appendChild(this.renderer.domElement);
          });
      },
      addLights() {
        const ambientLight = new THREE.AmbientLight(0xffffff, 0.5);
        this.scene.add(ambientLight);
        const directionalLight = new THREE.DirectionalLight(0xffffff, 0.5);
        directionalLight.position.set(1, 1, 1);
        this.scene.add(directionalLight);
      },
      addCamera() {
        this.camera = new THREE.PerspectiveCamera(75, 1, 0.1, 1000);
        this.camera.position.set(0, 10, 20);
        this.camera.lookAt(0, 0, 0);
      },
      loadModel() {
        const loader = new GLTFLoader();
        loader.load('path/to/your/model.glb', (gltf) => {
          this.model = gltf.scene;
          this.scene.add(this.model);
        }, undefined, (error) => {
          console.error(error);
        });
      },
      animate() {
        requestAnimationFrame(this.animate);
        this.model.rotation.y += 0.01;
        this.renderer.render(this.scene, this.camera);
      }
    }
  }
</script>
 
<style>
  .container {
    width: 750rpx;
    height: 750rpx;
    background-color: #000;
  }
</style>

这段代码展示了如何在UniApp中初始化Three.js，添加灯光、相机和3D模型，并使用GLTFLoader加载一个3D模型。在onReady生命周期钩子中，它设置了Three.js的场景、渲染器，并将渲染器挂载到Canvas上。然后，它添加了环境光和平行光，并设置了相机的位