??? ??????? ?????????? ???? ??? pglsa ??????? , ????????? ??????? ?? ???????????? ??????? ??? ????? ????????? ????? ??? 3D ???????? ??? pglsa ??????? ??? ???????? pglisa ????? : ?????????????????? ?????? ????????? ????????????? pg????? ?????????????????? ?????????? ????? ??????????????? ?????????? ???????? ??? ????? ??? ??????