效果1:

代码1:obj模型
import * as THREE from "three"
import {
OrbitControls } from "three/examples/jsm/controls/OrbitControls"
import {
AxesHelper, DirectionalLight, HemisphereLight, SphereBufferGeometry } from "three";
import{
MTLLoader} from "three/examples/jsm/loaders/MTLLoader"
import{
OBJLoader}from "three/examples/jsm/loaders/OBJLoader"
var renderer = new THREE.WebGLRenderer({
antialias: true });
document.body.appendChild(renderer.domElement);
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.setClearColor(0xffffff);
window.addEventListener("resize", () => {
renderer.setSize(window.innerWidth, window.innerHeight);
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
})
var camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 1000);
camera.position.set(0, 0, 50)
var control = new OrbitControls(camera, renderer.domElement);
var scene = new THREE.Scene();
var light = new HemisphereLight(0xffffff, 0x444444);
scene.add(light);
scene.add(new AxesHelper(1000));
update()
function update() {