Cesium如何开启第一人称视角（第三视角）漫游

第一人称视角漫游
官网教程：https://sandcastle.cesium.com/?src=Camera.html
参考：https://blog.csdn.net/xietao20/article/details/109403005（Cesium第一人称漫游）

 public losAngelesToDestination(adjustPitch: boolean) {
    const camera = this.scene.camera;

    const destinationOptions = {
      destination: Cartesian3.fromDegrees(121.506377, 31.245105, 3000.0),
      orientation: {
        heading: Math.toRadians(-15.0),
        pitch: -Math.PI_OVER_FOUR,
        roll: 0.0
      },
      duration: 20,
      // flyOverLongitude: Math.toRadians(30.0),
      pitchAdjustHeight: 0
    };

    const laOptions = {
      destination: Cartesian3.fromDegrees(120.2723, 30.3362, 10000.0),
      duration: 5,
      orientation: {
        heading: Math.toRadians(-15.0),
        pitch: -Math.PI_OVER_FOUR,
        roll: 0.0
      },
      pitchAdjustHeight: 0,
      complete: function () {
        callback();
      }
    };

    laOptions.complete = function () {
      setTimeout(function () {
        camera.flyTo(destinationOptions);
      }, 1000);
    };

    if (adjustPitch) {
      tokyoOptions.pitchAdjustHeight = 1000;
      laOptions.pitchAdjustHeight = 1000;
    }

    camera.flyTo(laOptions);
  }