【Cesium】禁止相机进入地下(地形穿透) 更新1.66版本后不需要

//禁止相机进入地下(地形穿透) 1.66版本后已经自带修复方法
function Lockpitch() {
    viewer.clock.onTick.addEventListener(function () {
        if (viewer.camera.pitch > 0) {
            viewer.scene.screenSpaceCameraController.enableTilt = false;
        }
    });

    var mousePosition, startMousePosition;
    var handler = new Cesium.ScreenSpaceEventHandler(viewer.canvas);
    handler.setInputAction(function (movement) {
        mousePosition = startMousePosition = Cesium.Cartesian3.clone(movement.position);
        handler.setInputAction(function (movement) {
            mousePosition = movement.endPosition;
            var y = mousePosition.y - startMousePosition.y;
            if (y > 0) {
                viewer.scene.screenSpaceCameraController.enableTilt = true;
            }
        }, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
    }, Cesium.ScreenSpaceEventType.RIGHT_DOWN);

}