viewer.camera.changed.addEventListener(
                        function () {
                            if (viewer.camera._suspendTerrainAdjustment && viewer.scene.mode === Cesium.SceneMode.SCENE3D) {
                                viewer.camera._suspendTerrainAdjustment = false;
                                viewer.camera._adjustHeightForTerrain();
                            }
                        }
                    );