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▶ 在线运行案例

你将学到什么

• 相机交互控制器
• requestAnimationFrame 渲染循环
• Clock 帧间隔计时

效果说明

Three.js 业务向场景组合。

应用场景 · Three.js

核心概念

• OrbitControls 轨道旋转缩放；开 enableDamping 时每帧需 controls.update()。

实现步骤

1. 搭建 Scene / Camera / Renderer 与 OrbitControls
2. rAF 循环中 update 并 render

代码要点

• animationLoop() — 案例中的独立逻辑模块，建议在线编辑器中跳转阅读
• CircularMotionOfLetters() — 案例中的独立逻辑模块，建议在线编辑器中跳转阅读
• create_ring_letter() — 案例中的独立逻辑模块，建议在线编辑器中跳转阅读

源码

import * as THREE from 'three';
import { OrbitControls } from "three/examples/jsm/Addons.js";
const DOM = document.getElementById('box')

var scene = new THREE.Scene();

var camera = new THREE.PerspectiveCamera(60, innerWidth / innerHeight);
camera.position.set(-1, 0.5, 1).setLength(75);

camera.lookAt(scene.position);

var renderer = new THREE.WebGLRenderer({ antialias: true });
renderer.setSize(innerWidth, innerHeight);
renderer.setAnimationLoop(animationLoop);
function animationLoop() {
    renderer.render(scene, camera);
}
DOM.appendChild(renderer.domElement);

window.addEventListener("resize", () => {
    camera.aspect = innerWidth / innerHeight;
    camera.updateProjectionMatrix();
    renderer.setSize(innerWidth, innerHeight);
});

var controls = new OrbitControls(camera, renderer.domElement);
controls.target.set(0, 12, 0);

controls.update();
controls.enableDamping = true;
controls.autoRotate = true;

var light = new THREE.DirectionalLight('white', 3);
light.position.set(1, 1, 1);
scene.add(light);
import{BoxGeometry, MeshLambertMaterial,Mesh,CanvasTexture,MeshBasicMaterial,Clock,CylinderGeometry,MathUtils,RepeatWrapping
} from 'three';

function CircularMotionOfLetters() {
    let g = new BoxGeometry();
    g.translate(0, 0.5, 0);
    let m = new MeshLambertMaterial({ color: 0x7f7f7f });
    for (let z = -5; z < 5; z++) {
        for (let x = -5; x < 5; x++) {
            let o = new Mesh(g, m);
            o.position.set(x, 0, z).multiplyScalar(4);
            o.rotation.y = Math.random() * Math.PI;
            let posLen = o.position.length();
            let posScale = 1 - MathUtils.clamp(posLen / 50, 0, 1);
            posScale = Math.pow(posScale, 4);
            o.scale.set(MathUtils.randInt(1, 4), 1 + Math.floor(Math.random() * posScale * 75), MathUtils.randInt(1, 4));
            if (posLen <= 25) {
                scene.add(o);
            }
        }
    }
    let cnvTexture;
    function create_ring_letter() {
        let cnv = document.createElement('canvas');
        cnv.width = 1024;
        cnv.height = 128;
        let ctx = cnv.getContext('2d');
        ctx.fillStyle = 'magenta';
        ctx.fillRect(0, 0, cnv.width, cnv.height);
        ctx.clearRect(0, 10, cnv.width, cnv.height - 20);
        ctx.textBaseline = 'middle';
        ctx.textAlign = "center";
        ctx.fillStyle = 'aqua';
        ctx.font = "bold 80px Arial";
        ctx.fillText("Welcome to Nico Space", cnv.width * 0.5, cnv.height * 0.5);
        cnvTexture = new CanvasTexture(cnv);
        cnvTexture.wrapS = RepeatWrapping;
        cnvTexture.wrapT = RepeatWrapping;
        cnvTexture.repeat.set(3, 1);
        let gc = new CylinderGeometry(25, 25, 5, 72, 1, true);
        const material = new MeshBasicMaterial({ alphaTest: 0.5, side: 2, map: cnvTexture });
        const mesh = new Mesh(gc, material);
        mesh.position.y = 25;
        scene.add(mesh);
    }
    create_ring_letter();
    let clock = new Clock();
    function animate() {
        requestAnimationFrame(animate);
        let t = clock.getDelta();
        cnvTexture.offset.x += t * 0.125;
    }
    animate();
}

CircularMotionOfLetters()

小结

• 建议先在 案例编辑器 运行，再对照源码逐步修改参数加深理解
• 更多同类案例见 应用场景目录

应用场景 · Three.js