Voxels

<!--
  示例：体素方块
  说明：12×12×6 的体素网格按三维噪声着色，像一块被剖开的立方体
  核心逻辑：BoxGeometry 批量实例 → 三维场映射颜色 → 单个 Primitive 绘制
  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>体素方块</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">体素高度按三维函数变化，颜色随高度与相位改变。</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 NX = 12, NY = 12, NZ = 6, S = 7;
  var lon = 116.3895, lat = 39.9035;
  var origin = Cesium.Transforms.eastNorthUpToFixedFrame(
    Cesium.Cartesian3.fromDegrees(lon, lat, 0)
  );

  var instances = [];
  for (var ix = 0; ix < NX; ix++) {
    for (var iy = 0; iy < NY; iy++) {
      for (var iz = 0; iz < NZ; iz++) {
        var v = Math.sin(ix * 0.7) * Math.cos(iy * 0.6) + Math.sin(iz * 0.9 + ix * 0.4);
        if (v < -0.55) continue;      /* 挖掉一部分，显出错落 */

        var local = Cesium.Matrix4.multiplyByPoint(
          origin,
          new Cesium.Cartesian3(
            (ix - NX / 2) * S, (iy - NY / 2) * S, iz * S + S / 2
          ),
          new Cesium.Cartesian3()
        );

        instances.push(new Cesium.GeometryInstance({
          geometry: new Cesium.BoxGeometry({
            dimensions: new Cesium.Cartesian3(S * 0.92, S * 0.92, S * 0.92),
            vertexFormat: Cesium.PerInstanceColorAppearance.VERTEX_FORMAT
          }),
          modelMatrix: Cesium.Matrix4.fromTranslation(local),
          attributes: {
            color: Cesium.ColorGeometryInstanceAttribute.fromColor(
              Cesium.Color.fromHsl(0.52 + v * 0.08, 0.45, 0.4 + iz * 0.04, 1.0)
            )
          }
        }));
      }
    }
  }

  scene.primitives.add(new Cesium.Primitive({
    geometryInstances: instances,
    appearance: new Cesium.PerInstanceColorAppearance({ flat: true }),
    asynchronous: false
  }));
  viewer.camera.flyTo({
    destination: Cesium.Cartesian3.fromDegrees(116.3840, 39.8992, 130),
    orientation: { heading: Cesium.Math.toRadians(38), pitch: Cesium.Math.toRadians(-14), roll: 0 },
    duration: 0
  });
})();
</script>
</body>
</html>