threejs初识 | 大帅老猿threejs特训

threejs初识 | 大帅老猿threejs特训

准备工作

• 要安装three 的 npm 模块，请在你的项目文件夹里打开终端窗口，并运行：

  npm install three

• 引入头文件

  import * as THREE from 'three';
  //相机轨道控制器
  import {OrbitControls} from "three/examples/jsm/controls/OrbitControls";
  //gltf资源加载器
  import {GLTFLoader} from "three/examples/jsm/loaders/GLTFLoader";
  //纹理贴图加载器
  import { RGBELoader } from 'three/examples/jsm/loaders/RGBELoader';

应用

• 创建场景

const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.01, 10);
camera.position.set(0.3, 0.3, 0.5);
//渲染器
const renderer = new THREE.WebGLRenderer({ antialias: true });
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);

const controls = new OrbitControls(camera, renderer.domElement);

//添加灯光
const directionLight = new THREE.DirectionalLight(0xffffff, 0.4);
scene.add(directionLight);

• 加载资源

let donuts;
new GLTFLoader().load('../resources/models/donuts.glb', (gltf) => {
    scene.add(gltf.scene);
    donuts = gltf.scene;

    mixer = new THREE.AnimationMixer(gltf.scene);
    const clips = gltf.animations; // 播放所有动画
    clips.forEach(function (clip) {
        const action = mixer.clipAction(clip);
        action.loop = THREE.LoopOnce;
        // 停在最后一帧
        action.clampWhenFinished = true;
        action.play();
    });

})

• 加载场景贴图

new RGBELoader()
    .load('../resources/sky.hdr', function (texture) {
        scene.background = texture;
        texture.mapping = THREE.EquirectangularReflectionMapping;
        scene.environment = texture;
        renderer.outputEncoding = THREE.sRGBEncoding;
        renderer.render(scene, camera);
});

• 动画方法实现

function animate() {
    requestAnimationFrame(animate);
    renderer.render(scene, camera);
    controls.update();

    if (donuts){
        donuts.rotation.y += 0.01;
    }
    if (mixer) {
        mixer.update(0.02);
    }
}

animate();

效果截图

结语

多学习，多动手。