Three.js学习项目--3D抗美援朝数据可视化

部分场景

体验地址

https://kmyc.hongbin.xyz/

操作说明 视频

我做了哪些（功能）

• draco解析glb模型 同时处理部分纹理请求 减轻一次加载纹理压力
• 手动控制轨道控制器镜头动画
• 多音频拼接 控制
• 封装动画播放器 控制进度切换
• 动画进度控制器 同步音频 模拟视频体验
• useContext状态共享
• 自定义多级右键菜单 模拟原生菜单体验
• 空闲时间加载后续用到的模型
• 模型纹理&位置动态切换
• echart图表使用
• 浏览器自适应单位vw vmax使用(大面积使用)
• 兼容移动端手机浏览
• 模型的销毁和动画加载
• useRef暴露方法多方调用(大量使用)
• css-in-js 方案实践 css引擎styled-component
• 未完成请求避免产生影响
• 未执行计数器清理 字幕播放中 镜头切换动画执行中切换 后续的功能等
• 点击不同模型产生不同效果 点击的事件监听 鼠标hover的样式
• …

局限

• 性能拉垮 考虑到诸多原因 未采用按需渲染在低配机上帧率大概只有30帧左右
• 模型做的不精细-第一次建模
• 在手机或者高刷设备上动画模型播放渲染速度与60帧设备不一致

源代码地址

https://gitee.com/honbingitee/kmyc

部分逻辑

按需渲染

controls.addEventListener('change', () => {renderer.render(scene, camera);
});

模型加载

https://hongbin.blog.csdn.net/article/details/122594047

动画控制器

https://hongbin.blog.csdn.net/article/details/123662686

模型纹理条件切换

/*** @description: 加载相册模型 返回相关操作回调* @param {number} animationIndex 战役索引* @param {THREE.TextureLoader} textureLoader 纹理加载器* @return {XCBack} XCBack*/
export async function loadXCModel(animationIndex: number,textureLoader: THREE.TextureLoader
): Promise<XCBack> {const gltf = await window.gltfLoader.loadAsync(xcModel);const [model] = gltf.scene.children;const multiple = 5;model.position.y = 1.8 * multiple;if (animationIndex === 1) {model.rotateY(-Math.PI / 2);model.rotateX(-Math.PI / 10);model.rotateZ(Math.PI / 10);}const setZero = (mash: typeof model) => {mash.scale.x = 0;mash.scale.y = 0;mash.scale.z = 0;};setZero(model);/*** 设置不同的纹理 -- 切换图片*/const setMaterial = (mash: Object3D, url: string) => {const texture = textureLoader.load(url);texture.flipY = false;texture.encoding = 3001;//@ts-ignoreconst mater = mash.material.clone(); //不能共用一个material 以为 instance.material 指向的都是同一个对象mater.map = texture;//@ts-ignoremash.material = mater;};const pictures: XCBack["models"] = [];for (let i = 0; i < 4; i++) {const instance = model.clone();//hover tipinstance.userData.type = ModelType["Picture"];instance.userData.desc = XCDesc[animationIndex]? XCDesc[animationIndex][i]: "";setMaterial(instance,`${process.env.REACT_APP_URL}xc/${animationIndex}-${i}-y.jpg`);if (animationIndex === 1) {instance.position.x = (i - 1) * -5 * multiple;instance.position.z = -14 * multiple;} else if (animationIndex === 2) {instance.position.x = -10 * multiple;instance.position.z = (i - 2) * 5 * multiple;} else {instance.position.x = -10 * multiple;instance.position.z = (i - 1) * 5 * multiple;}pictures.push(instance);}let timer1: number;let count = 0;const range = 30;const show = () => {if (count < range) {pictures.forEach(item => {item.scale.y += multiple / range;item.scale.z += (multiple / range) * 1.8;item.scale.x += multiple / range / 10;});count++;timer1 = requestAnimationFrame(show);}};const hide = () => {pictures.forEach(setZero);count = 0;cancelAnimationFrame(timer1);requestAnimationFrame(() => {cancelAnimationFrame(timer1);});};let prevIndex = animationIndex;const toggle: XCBack["toggle"] = nextIndex => {pictures.forEach((item, index) => {/*** hover 显示图片介绍*/item.userData.type = ModelType["Picture"];item.userData.desc = XCDesc[nextIndex][index];setMaterial(item,`${process.env.REACT_APP_URL}xc/${nextIndex}-${index}-y.jpg`);//旋转角度if (nextIndex === 1) {if (prevIndex !== 1) {item.rotateY(-Math.PI / 2);item.rotateX(-Math.PI / 10);item.rotateZ(Math.PI / 10);}} else {if (prevIndex === 1) {item.rotateY(Math.PI / 2);item.rotateX(Math.PI / 10);item.rotateZ(Math.PI / 10);}}//位置if (nextIndex === 1) {item.position.x = (index - 1) * -5 * multiple;item.position.z = -14 * multiple;} else if (nextIndex === 2) {item.position.x = -10 * multiple;item.position.z = (index - 2) * 5 * multiple;} else {item.position.x = -10 * multiple;item.position.z = (index - 1) * 5 * multiple;}});prevIndex = nextIndex;};return {show,hide,models: pictures,toggle,};
}

模型加载同时请求部分纹理 生成进度条

//加载10个纹理
const loadTexture = () => {const textureLoader = new TextureLoader();for (let i = 0; i < 10; i++) {const index = i.toString().padStart(2, "0");const url = `${process.env.REACT_APP_URL}q/${i}.jpg`;const texture = textureLoader.load(url,_ => {setProgress(timeCheck(5));},undefined,err => {console.error("load texture fail:", err);setProgress(timeCheck(5));});texture.flipY = false;texture.encoding = sRGBEncoding;addTexture(index, texture);}};//draco解析模型
const dracoLoader = () => {let prevModel = 0;const manager = new LoadingManager();manager.onProgress = (_, loaded, total) => {const progress = Math.floor((loaded / total) * 100);if (progress === 100) return setProgress(timeCheck(50 - prevModel));prevModel += progress / 4;setProgress(timeCheck(progress / 4));};//设置错误信息manager.onError = setIsLoadFail;//创建draco解析器const dracoLoader = new DRACOLoader(manager);dracoLoader.setDecoderConfig({ type: "js" });dracoLoader.setDecoderPath(process.env.REACT_APP_URL as string);// gltf 加载器const gltfLoader = new GLTFLoader(manager);gltfLoader.setDRACOLoader(dracoLoader);gltfLoader.load(mapModel, setMap);//不带LoadingManager的加载器 如果使用gltfLoader会触发事件改变progress状态造成内存泄漏const normalGltfLoader = new GLTFLoader();normalGltfLoader.setDRACOLoader(dracoLoader);window.gltfLoader = normalGltfLoader;};/*** 进度增长检测* @param {number} increase 增长的数值* @param {number} prev state原本数值* @return {number} newValue*/const timeCheck = (increase: number) => (prev: number) => {if (increase + prev < 100) return prev + increase;// >= 100 检测时间if (Date.now() - enterTime > maxLoadTime) return 100;//time < maxLoadTimetimer = setTimeout(() => {setProgress(100);}, maxLoadTime - (Date.now() - enterTime));//显示跳过按钮setIsCanJump(true);return prev;};

模型缩放小动画

let timer: number;
let i = 0;
const r = () => {if (i < 15) {timer = requestAnimationFrame(r);}for (const item of iconScene.children) {item.scale.x += 0.03;item.scale.y += 0.03;item.scale.z += 0.03;}i++;
};
r();