Plane

<!--
  示例：平面实体
  说明：两块倾斜的平面交叉立在地面上，像两片玻璃幕墙
  核心逻辑：plane.plane = new Plane(UNIT_Z, 0) → dimensions → orientation 控制姿态
  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>平面实体</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">平面本身没有厚度，靠 orientation 立起来；dimensions 是宽高米数。</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 pos1 = Cesium.Cartesian3.fromDegrees(116.3868, 39.9044, 40);
  var pos2 = Cesium.Cartesian3.fromDegrees(116.3898, 39.9040, 40);

  function addPlane(pos, heading, color) {
    viewer.entities.add({
      position: pos,
      orientation: Cesium.Transforms.headingPitchRollQuaternion(
        pos,
        new Cesium.HeadingPitchRoll(Cesium.Math.toRadians(heading), 0, 0)
      ),
      plane: {
        plane: new Cesium.Plane(Cesium.Cartesian3.UNIT_Z, 0.0),
        dimensions: new Cesium.Cartesian2(70, 46),
        material: Cesium.Color.fromCssColorString(color).withAlpha(0.55),
        outline: true,
        outlineColor: Cesium.Color.fromCssColorString('#cfe2f5')
      }
    });
  }

  addPlane(pos1, 20, '#4d9bff');
  addPlane(pos2, -35, '#d08a4e');
  viewer.camera.flyTo({
    destination: Cesium.Cartesian3.fromDegrees(116.3925, 39.9010, 150),
    orientation: { heading: Cesium.Math.toRadians(-30), pitch: Cesium.Math.toRadians(-8), roll: 0 },
    duration: 0
  });
})();
</script>
</body>
</html>