几年前发现Cesium的一个小惊喜，突然想起来，记录一下

viewer.entities.add({

polyline: {

positions: clampedCartesians,

    arcType: Cesium.ArcType.NONE,

    width:2,

    material:new Cesium.PolylineOutlineMaterialProperty({

color: Cesium.Color.YELLOW,

    }),

    depthFailMaterial:new Cesium.PolylineDashMaterialProperty({

color: Cesium.Color.BLUE

    })

},

});