曲线漫游Curve Roam▶ 在线运行案例 三维可视化效果——功能案例合集地址开源github仓库地址https://github.com/z2586300277/three-cesium-examples你将学到什么Cesium3DTileset 加载 3D Tiles 倾斜摄影Cesium Entity 高层实体 API3D Tiles 流式 LOD 场景requestAnimationFrame渲染循环与resize自适应效果说明本案例演示曲线漫游效果加载倾斜摄影或人工 3D Tiles 白膜并自动定位相机核心用到 Cesium3DTileset、Cesium、3D。建议先打开文首在线案例查看动态画面再对照下方源码逐步理解。核心概念Viewer聚合 Scene、Camera、Clock 与渲染循环是 Cesium 应用入口。Cesium3DTileset流式加载 LOD 瓦片适合城市倾斜摄影常用viewer.zoomTo(tileset)或viewBoundingSphere定位。Entity面向点线面/模型/标签的高层 API与 Primitive 相比更适合交互与属性驱动。实现步骤创建 Viewer配置地形/影像若案例需要并设置初始相机异步加载模型 / 3D Tiles / GeoJSON 等资源并加入 scene 或 entities在requestAnimationFrame循环中更新状态并 renderCesium 为viewer.render或自动渲染代码要点import * as Cesium from cesiumimport * as dat from dat.guiconst box document.getElementById(box)const viewer new Cesium.Viewer(box, {animation: false,//是否创建动画小器件左下角仪表baseLayerPicker: false,//是否显示图层选择器右上角图层选择按钮baseLayer: Cesium.ImageryLayer.fromProviderAsync(Cesium.ArcGisMapServerImageryProvider.fromUrl(GLOBAL_CONFIG.getLayerUrl()) ),fullscreenButton: false,//是否显示全屏按钮右下角全屏选择按钮timeline: false,//是否显示时间轴infoBox: false,//是否显示信息框})const tileset await Cesium.Cesium3DTileset.fromUrl(FILE_HOST 3dtiles/house/tileset.json)viewer.scene.primitives.add(tileset)viewer.flyTo(tileset);// 经纬度 高度 const list [ [121.47857119758791, 29.79125471709178, 16.455626729366145], [121.47888991686754, 29.79121144438129, 16.43945469952735], [121.4793563626501, 29.79115700403782, 16.500224202937577], [121.47959615722343, 29.791255451852457, 19.638183861734586], [121.4799150177678, 29.791206202923174, 19.709391069654206], [121.48017710101357, 29.791136574675704, 19.707021008968702], [121.48024839194412, 29.791355774130647, 16.498928502606283], [121.47938339181717, 29.791564467242317, 17.821189061225503], [121.4788135287918, 29.79168578787095, 19.667240655082814], [121.47901177358922, 29.791479635806983, 19.655729311572056] ]const cartesianPoints list.map(item Cesium.Cartesian3.fromDegrees(item[0], item[1], item[2] 3))// CatmullRomSpline 插值 const catmullRomSpline new Cesium.CatmullRomSpline({ points: cartesianPoints, times: cartesianPoints.map((_, index) index / (cartesianPoints.length - 1)) })const numPoints 1000 // 插值点数量 const interpolatedPoints [] for (let i 0; i numPoints; i) { const t i / (numPoints - 1) const point catmullRomSpline.evaluate(t) interpolatedPoints.push(point) }// 示例线路 viewer.entities.add({ name: 路线, polyline: { positions: interpolatedPoints, width: 1, material: Cesium.Color.YELLOW } })// 相机第一人称漫游 const flyControls { active: false, speed: 2.5, position: 0, loop: true, start() { this.active true; animate(); }, stop() { this.active false; }, reset() { this.position 0; } }// 简化的GUI控制面板 const gui new dat.GUI() gui.add(flyControls, speed).name(速度) gui.add(flyControls, loop).name(循环) gui.add(flyControls, start).name(开始) gui.add(flyControls, stop).name(停止) gui.add(flyControls, reset).name(重置)// 动画函数 function animate() { if (!flyControls.active) return;flyControls.position flyControls.speed / 10000;// 处理循环或结束 if (flyControls.position 1) { if (flyControls.loop) flyControls.position 0; else return flyControls.active false }// 计算当前位置和下一位置 const currentPos catmullRomSpline.evaluate(flyControls.position); const nextT flyControls.position 0.01 1 ? 0.01 : flyControls.position 0.01; const nextPos catmullRomSpline.evaluate(nextT);// 设置相机朝向 const direction Cesium.Cartesian3.subtract(nextPos, currentPos, new Cesium.Cartesian3()) if (Cesium.Cartesian3.magnitude(direction) 0.01) return requestAnimationFrame(animate); Cesium.Cartesian3.normalize(direction, direction)// 计算上方向(地球表面法向量) const up Cesium.Cartesian3.normalize(Cesium.Ellipsoid.WGS84.geodeticSurfaceNormal(currentPos, new Cesium.Cartesian3()), new Cesium.Cartesian3())viewer.camera.setView({ destination: currentPos, orientation: { direction, up } })requestAnimationFrame(animate)}完整源码GitHub小结本文提供曲线漫游完整 Cesium.js 源码与在线 Demo建议先运行案例再改 uniform/参数做二次实验更多 Cesium.js 实战案例见 three-cesium-examples 合集 与 GitHub 开源仓库