使用THREEJS实现一个可调节档位、可摇头的电风扇

夏天到了，用Three.js实现一个可以摇头和调节档位的电风扇。主要使用到Blender处理3D模型，用Vite+Typescript搭建项目框架。效果演示：

一、处理模型

1、从爱(bai)给(gei)网下载一个风扇的3D模型，在Blender中打开，给模型贴上图。

2、拆解模型。将风扇模型拆解成按钮、底座、扇叶、头部四个部分，其中按钮共五个，包括四个档位和一个摇头的开关。

3、导出模型。导出GLTF格式模型。

二、场景搭建

1、初始化场景

this.scene = new THREE.Scene();

/** 摄像机 */
this.camera = new THREE.PerspectiveCamera(75, this.sizes.width / this.sizes.height, 0.1, 100);
this.camera.position.set(0, 0.8, 1.8);

/** 灯光 */
this.lightPoint = new THREE.HemisphereLight(0xffffff, 0xffffff, 1 );
this.lightPoint.position.set(0, 500, 0);
this.scene.add(this.lightPoint);

/** 控制器 */
this.controls = new OrbitControls(this.camera, this.renderer.domElement);
this.controls.enableKeys = false;    // 禁用按键
this.controls.enableZoom = false;    // 禁用缩放
this.controls.enablePan = false;     // 禁用拖拽
this.controls.maxPolarAngle = 1.3;   // 最大垂直旋转角度
this.controls.minPolarAngle = 1.3;   // 最小垂直旋转角度
this.controls.target = new THREE.Vector3(0, 0.8, 0);

2、加载模型

import { GLTF, GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader';

var gltf: GLTF = await new Promise((resolve, _) => new GLTFLoader().load('./fan.glb', gltf => resolve(gltf)));
this.scene.add(gltf.scene);

3、绑定风扇按钮

this.fan = new Fan(gltf);

/** 档位调节按钮 */
let btns: Array<[string, Level]> = [
	['Btn_1', Level.one],
	['Btn_2', Level.two],
	['Btn_3', Level.three],
	['Btn_4', Level.zero],
];
btns.forEach(([name, level]) => {
	let btn = gltf.scene.getObjectByName(name);
	if (btn) this.fan.btns.push(new LevelBtn(btn, level));
});

/** 摇头按钮 */
let btn = gltf.scene.getObjectByName("Shake");
if (btn) this.fan.btns.push(new ShakeBtn(btn));

三、功能实现

1、扇叶旋转

function update() {
	let leaf = this.obj.scene.getObjectByName("Leaf");
	let rotationY = leaf!.rotation.y + Math.PI/10 * this.speed;
	while(rotationY > Math.PI * 2) rotationY = rotationY - Math.PI * 2;
	leaf!.rotation.y = rotationY;
	requestAnimationFrame(() => update());
}

2、档位调节

import { gsap } from 'gsap';

function turnLevel(btn: LevelBtn) {
	if(btn.state == BtnState.down) return;
	this.btns.filter(item => item instanceof LevelBtn).forEach(item => item.up());
	btn.down();
	if(btn.level !== Level.zero) this.state = State.on;
	this.level = btn.level;
	gsap.to(this, 3, { speed: this.level });
}

3、左右摇头

let head = this.obj.scene.getObjectByName("Head");
let shake = this.obj.scene.getObjectByName("Shake");
let leaf = this.obj.scene.getObjectByName("Leaf");
let rotationZ = head!.rotation.z + Math.PI / 1000 * this.shakeDir;
if(Math.abs(rotationZ) > Math.abs(this.shakeRange)) {
	let shakeDir = this.shakeDir;
	setTimeout(() => {
		if(shakeDir == ShakeDir.left) this.shakeDir = ShakeDir.right;
		else if(shakeDir == ShakeDir.right) this.shakeDir = ShakeDir.left;
	}, 1000)
	this.shakeDir = ShakeDir.wait;
	rotationZ = Math.abs(this.shakeRange) * Math.abs(rotationZ) / rotationZ;
}
head!.rotation.z = rotationZ;
leaf!.rotation.z = rotationZ;
shake!.rotation.z = rotationZ;

四、最后

项目代码和演示地址：https://codesandbox.io/p/sandbox/threejs-mini-fans-dx6nm6