three.js 入门 初识

//创建相机
const camera = new THREE.PerspectiveCamera(
  75,
  window.innerWidth / window.innerHeight,
  0.1,
  1000
);
// 设置相机位置
camera.position.set(0, 0, 10);

// 初始化渲染器
const renderer = new THREE.WebGLRenderer();
//设置渲染器为全屏
renderer.setSize(window.innerWidth, window.innerHeight);
// 将webgl渲染的canvas内容添加到body
document.body.appendChild(renderer.domElement);

// 创建几何体
const geometry = new THREE.BoxGeometry(1, 1, 1);

const sphereTexture = new THREE.SphereGeometry(1, 20, 20);

const planeGeometry = new THREE.PlaneGeometry(1, 1, 200, 200);

const light = new THREE.AmbientLight(0x404040);
scene.add(light);

const directionalLight = new THREE.DirectionalLight(0xffffff, 0.5);
// 设置直线光源的照射位置
directionalLight.position.set(10, 10, 10);
scene.add(directionalLight);

// 导入控制器
import { OrbitControls } from "three/examples/jsm/controls/OrbitControls";
const controls = new OrbitControls(camera, renderer.domElement);
controls.enableDamping = true;

const textureLoader = new THREE.TextureLoader();
const floorColor = textureLoader.load(require("../assets/img/door/color.jpg"));

// 材质
const material = new THREE.MeshBasicMaterial({
  map: floorColor
});

const geometry = new THREE.BoxGeometry(1,1,1); // 创建一个长宽高都为1个单位的立方体
const textureLoader = new THREE.TextureLoader();//初始化纹理
const floorColor = textureLoader.load(require("../assets/img/door/color.jpg"));//导入纹理为一张图片
const material = new THREE.MeshBasicMaterial({color: 0x00ff00,map: floorColor}); // 创建材质，对光照无感
const cube = new THREE.Mesh(geometry, material); // 创建一个立方体网格（mesh）,将材质包裹在立方体上
scene.add(cube); // 将立方体网格添加到场景中
 
camera.position.z = 5; // 指定相机位置
 
function animate() {
  // 照相机转动时，必须更新该控制器
  controls.update();
  // 结合场景和相机进行渲染，即用摄像机拍下此刻的场景
  renderer.render(scene, camera);
  // 渲染下一帧的时候就调用animate
  requestAnimationFrame(animate);
}
animate();

const axesHelper = new THREE.AxesHelper(5);
scene.add(axesHelper);

// 监听画面变化
window.addEventListener("resize", () => {
  const iwidth = window.innerWidth;
  const iheigt = window.innerHeight;
  //更新摄像头
  camera.aspect = iwidth / iheigt;
  // 更新摄像机投影矩阵
  camera.updateProjectionMatrix();
  // 更新渲染器
  renderer.setSize(iwidth, iheigt);
  // 设置渲染器像素比 防止在HiDPI显示器模糊（视网膜显示器）
  renderer.setPixelRatio(window.devicePixelRatio);
});

npm install --save dat.gui 
import * as dat from "dat.gui";

const gui = new dat.GUI();
gui
  .add(cube.position, "x")
  .min(0)
  .max(5)
  .step(0.05)
  .name("移动x坐标")
  .onChange((value) => {
    console.log("值被修改了：", value);
  });
 
// 修改物体的颜色
const params = {
  color: "#fff",
  fn: () => {
    gsap.to(cube.position, {
      x: 5,
      ease: "power1.out",
      duration: 5,
      repeat: -1,
      yoyo: true,
    });
  },
};
gui.addColor(params, "color").onChange((value) => {
  cube.material.color.set(value);
});
 
// 设置是否显示
gui.add(cube, "visible").name("是否显示");
 
// 设置按钮点击触发某个事件
var folder = gui.addFolder("设置立方体");
folder.add(cube.material, "wireframe");
folder.add(params, "fn").name("立方体运动");

​

// 设置cube纹理加载器
const cubeTextureLoader = new THREE.CubeTextureLoader();
const envMapTexture = cubeTextureLoader.load([
  require("../assets/img/environmentMaps/1/px.jpg"),
  require("../assets/img/environmentMaps/1/nx.jpg"),
  require("../assets/img/environmentMaps/1/py.jpg"),
  require("../assets/img/environmentMaps/1/ny.jpg"),
  require("../assets/img/environmentMaps/1/pz.jpg"),
  require("../assets/img/environmentMaps/1/nz.jpg"),
]);// p-正方向，n-负方向
 
// 创建球体
const sphereTexture = new THREE.SphereGeometry(1, 20, 20);
// 材质
const material = new THREE.MeshStandardMaterial({
  metalness: 0.7,
  roughness: 0,
});
 
// 关联几何体和材质
const spher = new THREE.Mesh(sphereTexture, material);
 
// 添加几何体到场景
scene.add(spher);
 
// 给场景添加背景
scene.background = envMapTexture;
// 给场景所有的物体添加默认的环境贴图
scene.environment = envMapTexture;

// 导入hdr加载器
import { RGBELoader } from 'three/examples/jsm/loaders/RGBELoader'
// 加载hdr环境图
const rgbeLoader = new RGBELoader();
rgbeLoader.loadAsync(require("../assets/img/hdr/012.hdr")).then((texture) => {
  texture.mapping = THREE.EquirectangularReflectionMapping; // 经纬线映射贴图
  scene.background = texture;
  scene.environment = texture;
})

import * as THREE from 'three'
import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader'
import { DRACOLoader } from 'three/examples/jsm/loaders/DRACOLoader'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls'
import robot from '../../public/robotglb.glb'
const scene = new THREE.Scene()
const camera = new THREE.PerspectiveCamera(
  75,
  window.innerWidth / window.innerHeight,
  0.1,
  1000
)
camera.position.set(0, 0, 10)
scene.add(camera)
 
const light = new THREE.AmbientLight(0xffffff)
scene.add(light)
 
 
//初始化模型加载器
const loader = new GLTFLoader()
//解压模型
const dracoLoader = new DRACOLoader()
//引入文件
dracoLoader.setDecoderPath('/draco/')
loader.setDRACOLoader(dracoLoader)
loader.load(
  robot,//模型
  gltf => {
    console.log(gltf, 'gltf')
    scene.add(gltf.scene)
  },
  xhr => {
    console.log(xhr)
  },
  err => {
    console.log(err)
  }
)
 
 
 
let mesh = new THREE.Mesh()
mesh.scale.set(6,6,6)
const renderer = new THREE.WebGLRenderer()
renderer.setSize(window.innerWidth, window.innerHeight)
document.body.appendChild(renderer.domElement)
const controls = new OrbitControls(camera, renderer.domElement)
 
 
 
function animate () {
  controls.update()
  renderer.render(scene, camera)
  requestAnimationFrame(animate)
}
animate()