entity 속성 변경할때 잘 안되면서 생기는 이상한 현상들 정리
const polylineEntity = viewer.entities.getById('XyToXyz_Polyline').polyline;
viewer.entities.getById('XyToXyz_Polyline').polyline.material = p.staticMaterial;
viewer.entities.getById('XyToXyz_Polyline').polyline.depthFailMaterial = p.staticMaterial;
const polylineEntity = s.entityArray[s.entityArray.length - 1].polyline._polyline;
polylineEntity._positions = new Cesium.ConstantProperty(staticCartesians);
polylineEntity._material = p.staticMaterial;
polylineEntity._depthFailMaterial = p.staticMaterial;