cesium相机绕点飞行

相机绕点飞行原理就是获取相机参数与点位置信息，添加时间监听，一直去改变相机的heading，关键代码如下：

function rotateHeading() {
// 相机的当前heading
    var heading = Cesium.Math.toDegrees(camera.heading);
    if(heading>=360 || heading<=-360) heading = 0;
    heading = heading + 0.25;//调节转动快慢
    var pitch = viewer.camera.pitch;
    var distance = viewer.camera.distance;
    var ellipsoid=viewer.scene.globe.ellipsoid;//获取椭球
    var cartographic=ellipsoid.cartesianToCartographic(viewer.camera.position);
    var lat=Cesium.Math.toDegrees(cartographic.latitude);
    var lng=Cesium.Math.toDegrees(cartographic.longitude);
    var distance=cartographic.height;
    scene.camera.setView({
        destination : Cesium.Cartesian3.fromDegrees(lng, lat, distance), // 点的坐标
        orientation: {
            heading : Cesium.Math.toRadians(heading),
            pitch : pitch,
            endTransform: Cesium.Matrix4.IDENTITY
        }
    });
}

 效果图如下：

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