选择三维点云的点,返回坐标:H=CLICKA3DPOINT(POINTCLOUD)showsa3Dpointcloudandletstheuser%selectpointsbyclickingonthem.Theselectedpointishighlighted%anditsindexinthepointcloudwillisprintedonthescreen.%POINTCLOUDshouldbea3*Nmatrix,represendingN3Dpoints.%Handletothefigureisreturned.%