Ground Label

<!--
  示例：贴地标牌与深度测试
  要点：label/point 设 heightReference 贴地，disableDepthTestDistance 归零后由深度测试决定遮挡
  依赖：CesiumJS 1.121 · jsDelivr CDN，坐标写死在页面内
-->
<!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>贴地标牌</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%}
  .hud{position:absolute;left:12px;top:12px;z-index:5;background:rgba(23,28,35,.9);
       border:1px solid #2a313b;border-radius:6px;padding:9px 12px;font-size:12px;
       color:#a2a9b6;max-width:252px}
  .hud b{color:#e6e8ec;font-weight:600}
  .hud .row{margin-top:7px}
  .hud button{font:inherit;font-size:12px;padding:3px 9px;border-radius:4px;cursor:pointer;
       border:1px solid #343b46;background:#1d232b;color:#cfd6e2}
  .hud button.on{background:#1d3a5c;border-color:#3d6f9e;color:#cfe4ff}
  .cesium-viewer-bottom .cesium-widget-credits,.cesium-viewer-animationContainer,
  .cesium-viewer-timelineContainer{display:none!important}
</style>
</head>
<body>
<div id="c"></div>
<div class="hud">
  <div><b>贴地标牌</b></div>
  <div class="row">六个山地点位，标牌锚在地表</div>
  <div class="row"><button id="depth" class="on">深度测试：开</button></div>
  <div class="row" id="info">标牌不会穿透地球背面</div>
</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;

  scene.globe.depthTestAgainstTerrain = true;

  var SITES = [
    { lng: 117.100000, lat: 36.250000, name: '泰山' },
    { lng: 110.080000, lat: 34.480000, name: '华山' },
    { lng: 103.330000, lat: 29.520000, name: '峨眉山' },
    { lng: 86.925000,  lat: 27.988000, name: '珠穆朗玛峰' },
    { lng: 128.060000, lat: 42.000000, name: '长白山' },
    { lng: 86.000000,  lat: 43.000000, name: '天山' }
  ];

  SITES.forEach(function (s) {
    viewer.entities.add({
      position: Cesium.Cartesian3.fromDegrees(s.lng, s.lat, 0),
      point: {
        pixelSize: 7,
        color: Cesium.Color.fromCssColorString('#ffb13d'),
        outlineColor: Cesium.Color.WHITE,
        outlineWidth: 1.5,
        heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
        disableDepthTestDistance: 0
      },
      label: {
        text: s.name,
        font: '500 12px "Microsoft YaHei", sans-serif',
        style: Cesium.LabelStyle.FILL_AND_OUTLINE,
        fillColor: Cesium.Color.WHITE,
        outlineColor: Cesium.Color.fromCssColorString('#0e1116'),
        outlineWidth: 3,
        pixelOffset: new Cesium.Cartesian2(0, -18),
        verticalOrigin: Cesium.VerticalOrigin.BOTTOM,
        heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
        disableDepthTestDistance: 0
      }
    });
  });

  var on = true;
  var btn = document.getElementById('depth');
  var info = document.getElementById('info');

  btn.addEventListener('click', function () {
    on = !on;
    if (on) {
      scene.globe.depthTestAgainstTerrain = true;
      btn.textContent = '深度测试：开';
      btn.className = 'on';
      info.textContent = '标牌不会穿透地球背面';
    } else {
      scene.globe.depthTestAgainstTerrain = false;
      btn.textContent = '深度测试：关';
      btn.className = '';
      info.textContent = '标牌浮在最前，背面也可见';
    }
    var list = viewer.entities.values;
    for (var i = 0; i < list.length; i++) {
      var e = list[i];
      if (e.label) e.label.disableDepthTestDistance = on ? 0 : Number.POSITIVE_INFINITY;
      if (e.point) e.point.disableDepthTestDistance = on ? 0 : Number.POSITIVE_INFINITY;
    }
  });

  viewer.camera.flyTo({
    destination: Cesium.Cartesian3.fromDegrees(104, 32, 12000000),
    orientation: { heading: 0, pitch: Cesium.Math.toRadians(-90), roll: 0 },
    duration: 0
  });
})();
</script>
</body>
</html>