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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