效果大概这样，这个宝箱模型是直接初始化就显示的，人物模型是自己本地添加上去的，代码如下。

<template>
  <div class="container" ref="container">
    <el-row>
      <el-col :span="24">
        <div class="grid-content ep-bg-purple-dark"></div>
        <el-tabs  v-model="activeTab" class="demo-tabs" @tab-click="handleClick">
          <el-tab-pane label="3d模型" name="first">
            <input type="file" accept=".obj,.pltf,.fbx" @change="handleFileUpload">
            <div ref="modelContainer"></div>
          </el-tab-pane>
        </el-tabs>
      </el-col>
    </el-row>
    
  </div>
</template>

<script>
import { ref, reactive, onMounted,getCurrentInstance} from 'vue'
import * as THREE from 'three'
import { OBJLoader } from 'three/examples/jsm/loaders/OBJLoader'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls'
import { AmbientLight, DirectionalLight } from 'three';

export default {
  setup() {
    const model = ref(null);
    const container = ref(null)
    const modelContainer = ref(null)
    const previewContainer = ref(null);

    const pond = FilePond.create(inputElement);
    const state = reactive({
      uploadedFile: null,
      modelLoaded: false
    })

    let scene = null 
    let controls = null


  
    
    onMounted(() => {
      // 初始化场景
      scene = new THREE.Scene() // 将 scene 赋值

      // 初始化相机c
      let camera = new THREE.PerspectiveCamera(
        75,
        container.value.clientWidth / container.value.clientHeight,//纵横比
        0.1,//近截面距离
        1000//远截面距离
      )
      camera.position.z = 5

      // 初始化渲染器
      let renderer = new THREE.WebGLRenderer({ antialias: true })
      renderer.setSize(container.value.clientWidth, container.value.clientHeight)
      modelContainer.value.appendChild(renderer.domElement)

       // 添加光源
       const ambientLight = new THREE.AmbientLight(0xffffff, 0.5); // 环境光
      const directionalLight = new THREE.DirectionalLight(0xffffff, 1); // 平行光
      directionalLight.position.set(1, 1, 1);

      scene.add(ambientLight);
      scene.add(directionalLight);

      // 初始化控制器
      initOrbitControls(camera, renderer)

      // 加载obj模型
      // const loader = new OBJLoader()
      // loader.load(
      //   './public/static/obj/man.obj',
      //   (object) => {
      //     // 加载成功后的回调函数
      //     // 在这里处理加载的模型对象
      //     handleModelLoaded(object, scene) // 将 scene 作为参数传递
      //   },
      //   (xhr) => {
      //     // 加载过程中的回调函数
      //     console.log((xhr.loaded / xhr.total) * 100 + '% loaded')
      //   },
      //   (error) => {
      //     // 加载失败的回调函数
      //     console.error('加载失败', error)
      //   }
      // )




        // 加载gltf模型
        const loader = new GLTFLoader();
         loader.load(
        './public/static/obj/scene.gltf',
        (gltf) => {
          scene.add(gltf.scene);
        },
        undefined,
        (error) => {
          console.error('加载失败', error);
        }
      );

      // 循环渲染
      const animate = () => {
        requestAnimationFrame(animate)
        renderer.render(scene, camera)     
      }
      animate()
    })

    // 更改颜色
    const handleModelLoaded = (object, scene) => {
      if (scene) {
        object.traverse((child) => {
          if (child instanceof THREE.Mesh) {
            child.material.color.set('#ff0000') 
          }
        })
        scene.add(object)
      } else {
        console.error('Scene is not defined')
      }
    }
    
    


    // 控制器
    function initOrbitControls(camera, renderer) {
      controls = new OrbitControls(camera, renderer.domElement)
      controls.enableDamping = true
      controls.enableZoom = true
      controls.autoRotate = false
      // 禁用自动旋转
      controls.autoRotateSpeed = 3
      // 设置自动旋转速度
      controls.enablePan = true
      // 启用相机平移
      controls.enableKeys = true
      // 启用键盘控制
      controls.keyPanSpeed = 7
      //平移速度
      controls.keys = {
        LEFT: 37,
        UP: 38,
        RIGHT: 39,
        BOTTOM: 40
      }
      // 键盘控制按键码设置
    }
    const getBigectURL = (event) => {
      const current = event.target.files[0]
      const fileReader = new FileReader()
      fileReader.readAsDataURL(current)
      fileReader.onload = (e) => {
        state.videoSrc = e.currentTarget.result
      }
    }
    return {
      container,
      modelContainer,
      ...state,
      initOrbitControls,
      activeTab: 'first',
      videoSrc: '',
      container,
      state,
      model,
    }
  }
}
</script>

<style>
.container {
  height: 100%;
  width: 100%;
}

</style>