ndingSphere.fromVertices(positions)
                        }),
                        // attributes : {
                        //     color : Cesium.ColorGeometryInstanceAttribute.fromColor(new Cesium.Color(1.0, 1.0, 0.0, 1.0))
                        // }
                    }),
                    // appearance: new Cesium.PerInstanceColorAppearance({
                    //     flat : true,
                    //     translucent : false
                    // }),
                    appearanc