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