• Cesium3DTileset：用于流式传输大量的异构3D地理空间数据集；

• Cesium3DTileStyle：瓦片集样式；

• Cesium3DTile：数据集中的一个瓦片;

• Cesium3DTileContent：瓦片内容；

• Cesium3DTileFeature：瓦片集要素，用于访问Tile中批量表中的属性数据，可通过scene.pick方法来获取一个 BATCH，即三维要素。

  • Cesium3DTileFeature.getPropertyNames() 方法获取批量表中所有属性名；

  • Cesium3DTileFeature.getProperty(string Name) 来获取对应属性名的属性值。

例1. 加载3DTiles

   var viewer = new Cesium.Viewer("cesiumContainer");
   // 添加3D Tiles
   var tileset = viewer.scene.primitives.add(
     new Cesium.Cesium3DTileset({
       url: "./data/Cesium3DTiles/Tilesets/Tileset/tileset.json",
       // maximumScreenSpaceError: 2, //最大的屏幕空间误差
       // maximumNumberOfLoadedTiles: 1000, //最大加载瓦片个数
     })
   );

例2.

//设置样式

       var properties = tileset.properties;
       if (Cesium.defined(properties) && Cesium.defined(properties.Height)) {
         tileset.style = new Cesium.Cesium3DTileStyle({
           color: {
             conditions: [
               ["${Height} >= 83", "color('purple', 0.5)"],
               ["${Height} >= 80", "color('red')"],
               ["${Height} >= 70", "color('orange')"],
               ["${Height} >= 12", "color('yellow')"],
               ["${Height} >= 7", "color('lime')"],
               ["${Height} >= 1", "color('cyan')"],
               ["true", "color('blue')"],
             ],
           },
         });
       }

//位置调整  

       var cartographic = Cesium.Cartographic.fromCartesian(
         tileset.boundingSphere.center
       );
       var surface = Cesium.Cartesian3.fromRadians(
         cartographic.longitude,
         cartographic.latitude,
         0.0
       );
       var offset = Cesium.Cartesian3.fromRadians(
         cartographic.longitude,
         cartographic.latitude,
         height
       );
       var translation = Cesium.Cartesian3.subtract(
         offset,
         surface,
         new Cesium.Cartesian3()
       );
       tileset.modelMatrix = Cesium.Matrix4.fromTranslation(translation);
     })
     .otherwise(function (error) {
       console.log(error);
     });

//拾取要素

    var handler = new Cesium.ScreenSpaceEventHandler(viewer.canvas);
    handler.setInputAction(function (movement) {
      var feature = viewer.scene.pick(movement.position);
      if (Cesium.defined(feature) && feature instanceof Cesium.Cesium3DTileFeature) {
        var propertyNames = feature.getPropertyNames();
        var length = propertyNames.length;
        for (var i = 0; i < length; ++i) {
          var propertyName = propertyNames[i];
          console.log(propertyName + ": " + feature.getProperty(propertyName));
        }
      }
    }, Cesium.ScreenSpaceEventType.LEFT_CLICK);