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