1. 添加标签和广告牌

 // 添加文字标签和广告牌
  var label = viewer.entities.add({
    position: Cesium.Cartesian3.fromDegrees(113.3191, 23.109, 750),
    label: {
      text: "广州塔",
      font: "24px sans-serif",
      fillColor: Cesium.Color.WHITE,
      outlineColor: Cesium.Color.BLACK,
      outlineWidth: 4,
      // FILL填充文字，OUTLINE勾勒标签，FILL_AND_OUTLINE填充文字和勾勒标签
      style: Cesium.LabelStyle.FILL_AND_OUTLINE,
      // 设置文字的偏移量
      pixelOffset: new Cesium.Cartesian2(0, -24),
      // 设置文字的显示位置,LEFT /RIGHT /CENTER
      horizontalOrigin: Cesium.HorizontalOrigin.CENTER,
      // 设置文字的显示位置
      verticalOrigin: Cesium.VerticalOrigin.BOTTOM,
    },
    billboard: {
      image: "./texture/gzt.png",
      width: 50,
      height: 50,
      // 设置广告牌的显示位置
      verticalOrigin: Cesium.VerticalOrigin.TOP,
      // 设置广告牌的显示位置
      horizontalOrigin: Cesium.HorizontalOrigin.CENTER,
    },
  });

2. 添加3D模型

  // 添加3D模型
  const airplane = viewer.entities.add({
    name: "Airplane",
    position: Cesium.Cartesian3.fromDegrees(113.3191, 23.109, 1500),
    model: {
      uri: "./model/Air.glb",
      // 设置飞机的最小像素
      minimumPixelSize: 128,
      // 设置飞机的轮廓
      silhouetteSize: 3,
      // 设置轮廓的颜色
      silhouetteColor: Cesium.Color.RED,
      // 设置相机距离模型多远的距离显示
      distanceDisplayCondition: new Cesium.DistanceDisplayCondition(0, 200000),
    },
  });

3. 添加3D建筑

• 使用cesium默认的白膜，它是基于开源地图Openstreet获取的。

  // 请求Openstreet地图白膜数据
  let tiles3d = await Cesium.createOsmBuildingsAsync();
  //添加到当前地图图层中
  const osmBuildings = viewer.scene.primitives.add(tiles3d);
  

  

• 给白膜添加随机颜色

  let tiles3d = await Cesium.createOsmBuildingsAsync();
  //添加随机颜色
  tiles3d.style = new Cesium.Cesium3DTileStyle({
  color: {
    conditions: [
      [
        "${feature['building']} === 'apartments'",
        "color('rgba(50, 255, 0, 0.5)')",
      ],
      [
        "${feature['building']} === 'office'",
        "color('rgba(255, 255, 0, 0.5)')",
      ],
      [
        "${feature['cesium#estimatedHeight']} > 300",
        "color('rgba(200, 200, 255, 0.7)')",
      ],
      [
        "${feature['cesium#estimatedHeight']} > 100",
        "color('rgba(100, 100, 255, 0.7)')",
      ],
      [
        "${feature['cesium#estimatedHeight']} > 50",
        "color('rgba(50, 50, 150, 0.7)')",
      ],
      ["true", "color('white')"],
    ],
  },
  show: true,
  });
  
  //按距离色值筛选
  tiles3d.style = new Cesium.Cesium3DTileStyle({
  defines: {
    distance:
      "distance(vec2(${feature['cesium#longitude']},${feature['cesium#latitude']}),vec2(113.3191,23.109))",
  },
  color: {
    conditions: [
      ["${distance} < 0.01", "color('rgba(0,0,100, 0.7)')"],
      ["${distance} < 0.02", "color('rgba(0,0,70, 0.5)')"],
      ["${distance} < 0.04", "color('rgba(0,0,50, 0.2)')"],
      ["true", "color('white')"],
    ],
  },
  show: "${distance} < 0.04 && ${feature['building']} === 'apartments'",
  });