Japan Buildings

<!--
  示例：高密度街区体块
  说明：密集小体块组成东京风格的街区，巷道与塔楼交错
  核心逻辑：小间距体块 → 高低混合 → 窄巷道留白
  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>高密度街区体块</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}
</style>
</head>
<body>
<div id="c"></div>
<div class="tip">体块间距很小，中间的窄缝就是巷道，几栋高层穿插其中。</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 palette = ['#4b5361', '#565f6e', '#616a7a', '#6c7687'];

  for (var i = 0; i < 18; i++) {
    for (var j = 0; j < 14; j++) {
      /* 每 4 格留一条巷道 */
      if (i % 5 === 0 || j % 6 === 0) continue;

      var tall = (i * 3 + j * 7) % 11 === 0;
      var h = tall ? 110 + (i % 4) * 26 : 16 + ((i + j) % 6) * 8;
      var w = tall ? 26 : 18 + (i % 3) * 4;

      viewer.entities.add({
        position: Cesium.Cartesian3.fromDegrees(
          116.3850 + i * 0.00056, 39.9012 + j * 0.00052, h / 2
        ),
        box: {
          dimensions: new Cesium.Cartesian3(w, w, h),
          material: Cesium.Color.fromCssColorString(
            tall ? '#7d8899' : palette[(i + j) % palette.length]
          ).withAlpha(0.96),
          outline: true,
          outlineColor: Cesium.Color.fromCssColorString('#0b0f14')
        }
      });
    }
  }
  viewer.camera.flyTo({
    destination: Cesium.Cartesian3.fromDegrees(116.3925, 39.8972, 480),
    orientation: { heading: Cesium.Math.toRadians(12), pitch: Cesium.Math.toRadians(-24), roll: 0 },
    duration: 0
  });
})();
</script>
</body>
</html>