Cesium 模拟飞机坠毁功能

1.模拟飞机坠毁

2.粒子火焰模拟

    //测试生成模型和粒子
    var lon = 115.405419;
    var lat = 40.918034;
    var height = 1000;
    var pos = { longitude: lon, latitude: lat, height: height }
    

    // 创建测试飞机
    var airplaneEntity = cm.CreateSingleModel(pos, "Airplane", '../Apps/SampleData/models/CesiumAir/Cesium_Air.glb', 64, "飞机测试");
    var startTime;//当前时间
    // 定义飞机坠毁函数
    function simulateCrash() {
      airplaneEntity.position=Cesium.Cartesian3.fromDegrees(pos.longitude, pos.latitude, pos.height);
      var startPos = cm.GetPosHeight(airplaneEntity);//开始位置
      var startlon = startPos.longitude;//开始经度
      var startlat = startPos.latitude;//开始纬度
      var startHeight = startPos.height;//开始高度
      console.log("飞机坠毁开始", startlon, startlat, startHeight);
      var endpos = GetDirectPos(airplaneEntity, 1000);//坠毁点
      var endlon = endpos.longitude;//坠毁点经度
      var endlat = endpos.latitude;//坠毁点纬度
      var endHeight = 0; // 坠毁后的高度
      var duration = 30; // 坠毁过程的持续时间（秒）
      console.log("飞机坠毁开始1", endlon, endlat, endHeight);

      var targetLatLngHeight = { longitude: endlon, latitude: endlat, height: endHeight }
      setEntityModel