3D Tiles Batch Table Hierarchy

<!--
  示例：批表层级的父子关系
  说明：三个园区各三栋楼，属性里记录园区、楼栋与高度，点击任意一栋显示层级信息
  核心逻辑：entity.properties 挂层级属性 → scene.pick 拾取 → getValue 取值写入浮层
  依赖：CesiumJS 1.121 · jsDelivr CDN
-->
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta name="robots" content="noindex,follow">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>批表层级的父子关系</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/cesium@1.121.0/Build/Cesium/Widgets/widgets.css">
<style>
  html,body{height:100%;margin:0}
  body{background:#0e1116;color:#e6e8ec;overflow:hidden;
       font:13px/1.6 -apple-system,"Segoe UI","PingFang SC",sans-serif}
  #c{height:100%}
  .tip{position:absolute;left:12px;top:12px;z-index:5;
       background:rgba(23,28,35,.9);border:1px solid #2a313b;border-radius:6px;
       padding:8px 12px;font-size:12px;color:#a2a9b6;max-width:320px;line-height:1.6}
  .cesium-viewer-bottom .cesium-widget-credits,.cesium-viewer-animationContainer,
  .cesium-viewer-timelineContainer{display:none!important}
  .info{position:absolute;right:12px;top:12px;z-index:5;background:rgba(23,28,35,.92);
       border:1px solid #2a313b;border-radius:6px;padding:8px 12px;font-size:12px;
       color:#a2a9b6;line-height:1.8;max-width:220px}
  .info b{color:#e6e8ec}
</style>
</head>
<body>
<div id="c"></div>
<div class="tip">点击任意建筑，右上角显示它所属的园区与楼栋。属性结构与批表的父子层级一致。</div>
<div id="info" class="info">点击任意一栋建筑查看属性</div>
<script src="https://cdn.jsdelivr.net/npm/cesium@1.121.0/Build/Cesium/Cesium.js"></script>
<script>
(function () {
  'use strict';

  var viewer = new Cesium.Viewer('c', {
    baseLayer: false,
    baseLayerPicker: false, geocoder: false, homeButton: false,
    sceneModePicker: false, navigationHelpButton: false,
    animation: false, timeline: false, fullscreenButton: false,
    infoBox: false, selectionIndicator: false
  });

  var scene = viewer.scene;
  scene.globe.baseColor = Cesium.Color.fromCssColorString('#1c2733');
  scene.backgroundColor = Cesium.Color.fromCssColorString('#0e1116');
  scene.skyBox.show = false;
  scene.sun.show = false;
  scene.moon.show = false;
  if (scene.skyAtmosphere) scene.skyAtmosphere.show = false;

  var parks = [
    { name: 'A 园区', lon: 116.3866, lat: 39.9038, color: '#4d7cff' },
    { name: 'B 园区', lon: 116.3910, lat: 39.9038, color: '#3ecf8e' },
    { name: 'C 园区', lon: 116.3954, lat: 39.9038, color: '#ffb44d' }
  ];

  parks.forEach(function (park, pi) {
    for (var b = 0; b < 3; b++) {
      var h = 22 + b * 14;
      var pos = Cesium.Cartesian3.fromDegrees(park.lon + b * 0.0012, park.lat + (pi - 1) * 0.0016, h / 2);
      viewer.entities.add({
        position: pos,
        box: {
          dimensions: new Cesium.Cartesian3(26, 26, h),
          material: Cesium.Color.fromCssColorString(park.color).withAlpha(0.85),
          outline: true,
          outlineColor: Cesium.Color.WHITE.withAlpha(0.35)
        },
        properties: {
          park: park.name,
          building: park.name.charAt(0) + '-' + (b + 1),
          height: h + ' 米'
        }
      });
    }
  });

  var info = document.getElementById('info');
  var handler = new Cesium.ScreenSpaceEventHandler(scene.canvas);
  handler.setInputAction(function (click) {
    var picked = scene.pick(click.position);
    if (!picked || !picked.id || !picked.id.properties) {
      info.style.display = 'none';
      return;
    }
    var p = picked.id.properties;
    info.innerHTML = '<b>' + p.park.getValue() + '</b><br>楼栋：' + p.building.getValue() +
                     '<br>高度：' + p.height.getValue();
    info.style.display = 'block';
  }, Cesium.ScreenSpaceEventType.LEFT_CLICK);

  viewer.camera.flyTo({
    destination: Cesium.Cartesian3.fromDegrees(116.391, 39.8985, 620),
    orientation: { heading: 0, pitch: Cesium.Math.toRadians(-28), roll: 0 },
    duration: 0
  });
})();
</script>
</body>
</html>