cesium贴地画线

 polylineGeometry = viewer.entities.add({
                    name: "newPolygon",
                    polyline: {
                        positions: new CallbackProperty(e => {
                            return tempPoints;
                        }, false),
                        clampToGround: true,//贴地画线
                        width: 5.0,
                        material: new PolylineGlowMaterialProperty(cesiumColor.GOLD),
                        depthFailMaterial: new PolylineGlowMaterialProperty(cesiumColor.GOLD),
                    }
                });